MCV31R - Saw Maruyama - Free user manual and instructions

USER MANUAL MCV31R Maruyama

Line drawing of a chain drive with visible teeth and blade (no text or symbols)

The POWER in Outdoor Power

Completely read and understand this manual PRIOR to using this product.

Limited Warranty Statement

All Maruyama commercial/ industrial products are warranted to the original purchaser to be free from defects in material and workmanship from the date of purchase for the time periods listed as follows:

Lifetime for inner drive shaft on trimmers and brush cutters and all ignition modules.

3 years for residential, non-institutional, non-income producing use.

1 year for industrial, commercial, institutional, rental and income producing use.

Maruyama AE series engines and Kawasaki TEX45/TEX54 are covered exclusively for one additional year of industrial, commercial, institutional, rental and income producing use (total of 2 years). All other engines refer to engine manufacturer's warranty statement.

Any part of a Maruyama product found to be defective within the applicable warranty period shall, at Maruyama's option, be repaired or replaced without charge. Warranty consideration is obtained by delivering any Maruyama product believed to be defective to an Authorized Maruyama Servicing Dealer within the applicable warranty period.

The purchaser shall not be charged for diagnostic labor that leads to the determination that a warranted part is defective, if the diagnostic work is performed at a Maruyama Dealer.

Any warranted part which is not scheduled for replacement as required maintenance, or which is scheduled only for regular inspection to the effect of "repair or replace as necessary" shall be warranted for the warranty period. Any warranted part, which is scheduled for replacement as, required maintenance shall be warranted for the period of time up to the first scheduled replacement point for that part. Maruyama Mfg. Co., Inc. is liable for damages to other engine components caused by the failure of a warranted part still under warranty.

The purchaser is responsible for the performance of the required maintenance, as defined by Maruyama Mfg. Co., Inc. in the Owner's/Operator's Manual.

EMISSION-RELATED PARTS WARRANTY: In addition to the above warranty coverage, Maruyama Mfg. Co., Inc. will repair or replace, free of charge, for the original purchaser and each subsequent purchaser any emission-related part or parts found to be defective in material and workmanship for two (2) years from original retail delivery date. Emission-related parts are the carburetor assembly, the ignition coil assembly, the ignition rotor, the spark plug, the catalytic converter and the fuel tank. Any replacement part that is equivalent in performance and durability may be used in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of Maruyama Mfg. Co., Inc.

This warranty does not cover the following:

1. Maintenance items (excluding defects in materials and workmanship) including hoses, spark plugs, starter rope, air and fuel filters, throttle cables and all pump attachments, etc.
2. Extra expenses including shipping and handling, travel, payment for lost time or pay and for any inconvenience and storage.
3. Alterations or modifications including aftermarket parts not authorized by Maruyama U.S., Inc.
4. Wear, accident, abuse, neglect, misuse, negligence, improper fuels, lubricants, fuel mixtures (when applicable), or failure to operate or maintain the product in accordance with instructions approved by Maruyama.

Repair or replacement as provided under this warranty is the exclusive remedy of the consumer. Maruyama shall not be liable for any incidental or consequential damages for breach of any express or implied warranty on these products except to the extent prohibited by applicable law. Any implied warranty of merchantability or fitness for a particular purpose on these products is limited in duration to the warranty period as defined in the limited warranty statement. Maruyama reserves the rights to change or improve the design of the product without notice and does not assume obligation to update previously manufactured products.

This warranty provides you with specific legal rights, which may vary from state to state.

It is the Owner's and Dealer's responsibility to make sure the Warranty Registration Card is properly filled out and mailed to Maruyama U.S., Inc. Proof of purchase and registration will be required in order to obtain warranty service.

To locate an Authorized Maruyama Servicing Dealer nearest you, contact:.

Maruyama U.S., Inc.

4770 Mercantile Drive, suite 100,

Fort Worth, TX 76137 U.S.A.

[phone]

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

THE AIR INDEX OF THIS ENGINE IS 3 0 2 4 6 8 10 MOST CLEAN LEAST CLEAN NOTE:THE LOWER THE AIR INDEX, THE LESS POLLUTION THIS ENGINE IS CERTIFIED TO BE EMISSIONS COMPLIANT FOR THE USE:EXTENDED: 300HOURS CHECK THE OWNER'S MANUAL FOR FURTHER DETAILS.

MCV31R

FEDERAL EMISSION CONTROL WARRANTY STATEMENT YOUR WARRANTY RIGHTS AND OBLIGATIONS

The U.S. Environmental Protection Agency (EPA), and Maruyama Manufacturing Company, Inc. are pleased to explain the emission control system warranty on your small off-road engine. New 1997 and later model year small off-road engines must be designed, built and equipped, at the time of sale, to meet the U.S. EPA regulations for small off-road engines. The equipment engine must be free from defects in materials and workmanship which cause it to fail to conform with U.S. EPA standards for the first two years of engine use from the date of sale to the ultimate purchaser. Maruyama Manufacturing Company, Inc. must warrant the emission control system on your small off-road engine for the period of time listed above provided there has been no abuse, neglect or improper maintenance of your small off-road engine.

Emission durability of 300 hours.

Your emission control system may include parts such as the carburetor or fuel injection system, the ignition system, and catalytic converter. Also included may be hoses, belts, and connectors and other emission related assemblies.

Where a warrantable condition exists, Maruyama Manufacturing Company, Inc. will repair your small off-road engine at no cost to you, including diagnosis (if the diagnostic work is performed at an authorized dealer), parts, and labor.

MANUFACTURER'S WARRANTY COVERAGE:

The 1997 and later model year small off-road engines are warranted for two years. If any emission-related part on your engine is defective, the part will be repaired or replaced by Maruyama Manufacturing Company, Inc. free of charge.

OWNER'S WARRANTY RESPONSIBILITIES:

(a) As the small off-road engine owner, you are responsible for the performance of the required maintenance listed in your Owner's/Operator's Manual.

Maruyama Manufacturing Company, Inc. recommends that you retain all receipts covering maintenance on your small off-road engine, but Maruyama Manufacturing Company, Inc. cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance. Any replacement part or service that is equivalent in performance and durability may be used in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of the engine manufacturer.

(b) As the small off-road engine owner, you should be aware, however, that Maruyama Manufacturing Company may deny you warranty coverage if your small off-road engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.

(c) You are responsible for presenting your small off-road engine to a Maruyama Manufacturing Company, Inc. service center as soon as a problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.

If you have any questions regarding your warranty rights and responsibilities, you should contact Maruyama U.S., Inc. at 1-866-783-7400, or [e-mail].

COVERAGE

Maruyama Manufacturing Company, Inc. warrants to the ultimate purchaser and each subsequent purchaser that your small off-road engine will be designed, built and equipped, at the time of sale, to meet all applicable regulations. Maruyama Manufacturing Company, Inc. also warrants to the initial purchaser and each subsequent purchaser that your small off-road engine is free from defects in materials and workmanship which cause the engine to fail to conform with applicable regulations for a period of two years.

The 1997 and later model years, EPA requires manufacturers to small off-road engines for two years. These warranty periods will begin on the date the small off-road engine is purchased by the initial purchaser. If any emission-related part on your engine is defective, the part will be replaced by Maruyama Manufacturing Company, Inc. at no cost to the owner.

Maruyama Manufacturing Company, Inc. shall remedy warranty defects at any authorized Maruyama Manufacturing Company, Inc. engine dealer or warranty station. Any authorized work done at an authorized dealer or warranty station shall be free of charge to the owner if such work determines that a warranted part is defective. Any manufacturer-approved or equivalent replacement part may be used for any warranty maintenance or repairs on emission-related parts, and must be provided free of charge to the owner if the part is still under warranty, Maruyama Manufacturing Company, Inc. is liable for damages to other engine components caused by the failure of a warranted part still under warranty.

EPA considers emission-related warranted parts to include all the parts listed below.

These warranted parts are: the carburetor assembly, the ignition coil assembly, the ignition rotor, the spark plug, the catalytic converter, and the fuel tank.

MAINTENANCE REQUIREMENTS

The owner is responsible for the performance of the required maintenance as defined by the Maruyama Manufacturing Company, Inc. in the Owner's/Operator's Manual.

LIMITATIONS

This Emission Control System Warranty shall not cover any of the following:

(a) repair or replacement required because of misuse or neglect, lack of required maintenance, repairs improperly performed or replacements not conforming to Maruyama Manufacturing Company, Inc. specifications that adversely affect performance and/or durability, and alterations or modifications not recommended or approved in writing by Maruyama Manufacturing Company, Inc., and

(b) replacement of parts and other services and adjustments necessary for required maintenance at and after the first scheduled replacement point.

CALIFORNIA EMISSION CONTROL WARRANTY STATEMENT YOUR WARRANTY RIGHTS AND OBLIGATIONS

The California Air Resources Board (CARB), and Maruyama Manufacturing Company, Inc. are pleased to explain the emission control system warranty on your 2013 small off-road engine. In California, new small off-road engines must be designed, built and equipped to meet the State's stringent anti-smog standards. Maruyama Manufacturing Company, Inc. must warrant the emission control system on your small off-road engine for the period of time listed above provided there has been no abuse, neglect or improper maintenance of your small off-road engine.

Your emission control system may include parts such as the carburetor or fuel injection system, the ignition system, fuel tank and catalytic converter. Also included may be hoses, belts, and connectors and other emission related assemblies.

Where a warrantable condition exists, Maruyama Manufacturing Company, Inc. will repair your small off-road engine at no cost to you, including diagnosis, parts, and labor.

MANUFACTURER'S WARRANTY COVERAGE:

The 1995 and later small off-road engines are warranted for two years. If any emission-related part on your engine is defective, the part will be repaired or replaced by Maruyama Manufacturing Company, Inc.

OWNER'S WARRANTY RESPONSIBILITIES:

(a) As the small off-road engine owner, you are responsible for the performance of the required maintenance listed in your Owner's/Operator's Manual.
Maruyama Manufacturing Company, Inc. recommends that you retain all receipts covering maintenance on your small off-road engine, but Maruyama Manufacturing Company, Inc. cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance.

(b) As the small off-road engine owner, you should be aware, however, that Maruyama Manufacturing Company may deny you warranty coverage if your small off-road engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.

(c) You are responsible for presenting your small off-road engine to a Maruyama Manufacturing Company, Inc. distribution center as soon as a problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.

If you have any questions regarding your warranty rights and responsibilities, you should contact Maruyama U.S., Inc. at 1-866-783-7400, or [e-mail].

Emission System Parts

Exhaust Emission

Carburetor, Air Filter, Fuel Filter

Muffler, Catalytic Converter

Ignition Coil / Magneto, Spark Plug

EGR Valve (piston)

Evaporative Emission Fuel Tank

TABLE OF CONTENTS

Limited Warranty Statement ......1	Before operation· ......22
Federal Emission Control ......3	Starting and stopping procedure ......25
California Emission Control· ......5	Oiler adjustment ......28
Table of contents ......6	Chain adjustment ......28
Introduction ......6	Chain brake ......29
Safety precautions for chain saw users ......7	Cutting instruction ......31
Specifications ......9	Saw chain maintenance ......35
Product description ......10	Regular maintenance ......37
Marking......11	Carburetor adjustment ......42
Symbol Explanation ......12	Storage ......43
Safety instructions ......13	Troubleshooting ......44
Assembly ......17	Maintenance period ......45
Assembly for e-JUST ......20

Introduction

Thank you for purchasing a Maruyama product.

Maruyama, it's distributors, and dealers want you to be completely satisfied with your new product. Please feel free to contact your local Authorized Service Dealer for help with service, genuine Maruyama parts, or other information you may require.

Whenever you contact your Authorized Service Dealer or the factory, always know the serial number of your product. This number will help the Service Dealer or Service Representative provide exact information about your specific product. You will find the model and serial number located in a unique place on the product (MARKING on page US-11).

For your convenience, write the product model name and serial number in the space to the light.

Model Name ____ Serial No. ____

Read this manual carefully to learn how to operate and maintain your product correctly. Reading this manual will help you and others avoid personal injury and damage to the product.

Although Maruyama designs, produces and markets safe, state-of-the-art products, you are responsible for using the product properly and safely. (You are also responsible for training persons who you allow to use the product about safe operation.)

WARNING

It is essential that any operator of this Chain Saw reads and understands the contents of this manual before using the Chain Saw.

For additional assistance, contact any local authorized MARUYAMA dealer.

SAFETY PRECAUTIONS FOR CHAIN SAW USERS

KICKBACK SAFETY PRECAUTIONS

WARNING

Kickback may occur when the nose or tip of the guide bar touches an object, or when the wood closes in and pinches the saw chain in the cut. Tip contact in some cases may cause a lightning-fast reverse reaction, kicking the guide bar up and back toward the operator. Pinching the saw chain along the top of the guide bar may push the guide bar rapidly back toward the operator. Either of these reactions may cause you to lose control of the saw, which could result in serious personal injury. Do not rely exclusively upon the safety devices built into your saw. As a chain saw user, you should take several steps to keep your cutting jobs free from accident or injury.

1. With a basic understanding of kickback, you can reduce or eliminate the element of surprise. Sudden surprise contributes to accidents.
2. Keep a good firm grip on the saw with both hands, the right hand on the rear handle and the left hand on the front handle, when the engine is running. Use a firm grip with thumbs and fingers encircling the chain saw handles. A firm grip will help you reduce kickback and maintain control of the saw. Don't let go.
3. Make sure that the area in which you are cutting is free from obstructions. Do not let the nose of the guide bar contact a log, branch, or any other obstruction that could be hit while you are operating the saw.
4. Cut at high engine speeds.
5. Do not overreach or cut above shoulder height.
6. Follow the manufacturer's sharpening and maintenance instructions for the saw chain.
7. Only use replacement bars and chains specified by the manufacturer or the equivalent.

OTHER SAFETY PRECAUTIONS

1. Do not operate a chain saw with one hand! Serious injury to the operator, helpers, bystanders, or any combination of these persons may result from one-handed operation. A chain saw is intended for two-handed use.
2. Do not operate a chain saw when you are fatigue.
3. Use safety footwear; snug-fitting clothing; protective gloves; and eye, hearing, and head protection devices.
4. Use caution when handling fuel. Move the chain saw at least 10 feet (3 m) from the fueling point before starting the engine.
5. Do not allow other persons to be near the chain saw when starting or cutting with the chain saw. Keep bystanders and animals out of the work area.
6. Do not start cutting until you have a clear work area, secure footing, and a planned retreat path from the falling tree.
7. Keep all parts of your body away from the saw chain when the engine is running.
8. Before you start the engine, make sure that the saw chain is not contacting anything.
9. Carry the chain saw with the engine stopped, the guide bar and saw chain to the rear, and the muffler away from your body.
10. Do not operate a chain saw that is damaged, improperly adjusted, or not completely and securely assembled. Be sure that the saw chain stops moving when the throttle control trigger is release.
11. Shut off the engine before setting the chain saw down.
12. Use extreme caution when cutting small-size brush and saplings because slender material may catch the saw chain and be whipped toward you or pull you off balance.

13. When cutting a limb that is under tension, be alert for springback so that you will not be struck when the tension in the wood fibers is released.

14. Keep the handles dry, clean, and free of oil or fuel mixture.

15. Operate the chain saw only in well-ventilated areas.
16. Do not operate a chain saw in a tree unless you have been specifically trained to do so.
17. All chain saw service, other than the items listed in the Owner's/Operator's Manual. maintenance instructions, should be performed by competent chain saw service personnel. (For example, if improper tools are used to remove the flywheel or if an improper tool is used to hold the flywheel in order to remove the clutch. Structural damage to the flywheel could occur and subsequently could cause the flywheel to burst.).
18. When transporting your chain saw, use the appropriate guide-bar scabbard.

SPECIFICATIONS

Models MCV31R
Length × Width × Height *		413×244×238mm
Dry Weight (empty tanks) *		3.4kg
Fuel Tank Capacity 240cm		3
Tank Capacity for chain lubrication oil 180cm		3
Engine	Type Air cooled 2-cycle single cylinder
	Engine Displacement 30.1cm	3
	Maximum engine power (kw)	1.04
	Carburetor Walbro Diaphragm type
	Magneto Flywheel magneto, CDI system
	Spark Plug:Make Type Electrode Gap	NGKBPM8Y0.6 ~ 0.7mm
	Starter Recoil starter
	Power transmission Automatic centrifugal clutch
	Recommended maximum speed with cutting attachment	12000 r/min
	Recommended speed at idling 3000 r/min
	Fuel Mixture 50:1
Guide bar		12 inches guide Bar14 inches guide Bar
Chain	Specified pitch 9.53mm, 3/8 inch
	Specified gauge (thickness of drive links)	1.27 mm, 0.050 inch
	Type of chain	Oregon 91PX
	Lubrication	Adjustable automatic oil pump
Drive Sprocket	number of teeth	6
	Pitch	9.53 mm, 3/8 inches
Other devices		Front hand guard, Throttle trigger lockout, Chain catcher, Chain brake, Anti-vibration device, Spark arrester muffler
Option		Spiked bumper

※ Without guide bar and saw chain
Emission durability of 300 hours.
You should only use the saw with the bar and chain combination we recommend in the chapter SAW CHAIN MAINTENANCE.

PRODUCT DESCRIPTION

MODEL:MCV31R

Front hand guard Front handle Saw chain Guaide bar Primer pump Fuel tank cap Oil tank cap Starter grip Cleaner cover knob Cleaner cover Throttle trigger Throttle trigger lockout Rear handle

Ignition switch Chain tension adjuster Chain catcher Chain case Muffler (Silencer) Choke knob

Simple line drawing of a curved, elongated object with a central hole (no text or symbols)

Guide bar cover 13x19 mm T-wrench

(Combination screwdriver/ spark plug socket)

Owner's/Operator's Manual

MARKING

#287161 #285188 TO AVOID KICKBACK Both of the operator's hands must be used to operate the chain saw. Contact of the guide bar tip with any object should be avoided. Tip contact may cause the guide bar to move suddenly upward and backward, which may cause serious injury. 272016 #272016 MARLNAMA MCV31R MADE IN JAPAN #272806 GUIDE BAR CHAIN REPLACEMENT BAR AND CHAIN P/N OREGON P/N OREGON 12' 120SDEA041 91PX045E 14' 140SDEA041 91PX052E 272019 #272019

A*12345 Serial number #272017 WARNING: Read and follow all safety precautions in the instruction manual. Failure to follow instructions could result in serious personal injury. 272017 #282631

SYMBOL EXPLANATION

	Read and understand this Manual before using this product.		Always use: A protective helmet. Ear protection. Protective glasses or visor.
	Fire Danger: Gasoline is highly flammable. Never add fuel to the Chain Saw with a running or hot engine. Do not smoke or place any sources of heat in the vicinity of the fuel.		Hot Surface Warning: Contact may cause burns. During use and for some time after stopping the engine, the engine is very hot. Do not touch engine components such a cylinder, muffler and engine covers until the engine has cooled to ambient temperature.
	Warning.Kickback may occur!		One handed operation of the chain saw can be dangerous.
	Oil and petrol mixture		Chain oil fill
	O: off / Engine stopI : on / Engine start		CHOKE -Pull choke knob to "COLD START"
	Recommended maximum speed		Turning the screw in + direction (large arrow) will increase the amount of chain oil, or in the - direction (small arrow) will decrease it.
	Carburetor adjustment High speed mixture	[2606]	Carburetor adjustment Low speed mixture
	Carburetor adjustment Idle speed		Primer pump
	Chain brake operation

This symbol means whatever is show is prohibited.

SAFETY INSTRUCTIONS

The warning system in This manual identifies potential hazards and has special safety messages that help you and others avoid personal injury, even death.

ADANGER, WARNING and CAUTION are signal words to identify the level of hazard.

ADANGER: signals an extreme hazard that will cause serious injury or death if the recommended precautions are not followed.
⚠ WARNING: signals a hazard that may cause serious injury or death if the recommended precautions are not followed.
⚠️CAUTION: signals a hazard that may cause minor or moderate injury if the recommended precautions are not followed. Two other words are also used to highlight information. "Important" calls attention to special mechanical information and "Note" emphasizes general information worthy of special attention.

OPERATOR SAFETY

1 Read and understand this Manual before using this product. Be thoroughly familiar with the proper use of this product.
2 Never allow children to operate the Chain Saw. It is not a toy. Never allow adults to operate the unit without first reading the Owner's/Operator's Manual.
3 Always wear eye protection that complies with ANSI (American National Standards Institute) Z87.1.
4 Always wear eye protection, hearing protection and a face filter mask. Making a selection of hearing protector, please select a high-frequency prevention type of hearing protector. Please consult about the selection of hearing protector at service shop in the detail.

5 Always wear sturdy boots with nonslip soles.
6 Always wear a cap or hat. A safety hard hat is highly recommended when felling or working under trees.
7 Always wear heavy long pants, a long sleeved shirt, boots and gloves. Do not wear loose clothing, jewelry, short pants, sandals, or go barefoot. Secure hair so it is above shoulder length. Making a selection of protectors (protective clothing, gloves, foot protection, and etc.), please select durable light weight, and warm one to prevent fatigue. You may have seriously injured without proper protection.

8 Never operate this Chain Saw when you are tired, ill, under the influence of alcohol, drugs or medication.

9 Never start or run the engine inside a closed room or building. Breathing exhaust fumes can cause death.

10 Operate the chain saw only in well-ventilated areas. Exhaust gas, oil mist or saw dusts are harmful to health.

11 Keep handles clean of oil, fuel and dirt.

Line drawing of a person in uniform with hat and boots (no text or symbols)

Abstract black-and-white graphic of a stylized human figure with patterned head and torso (no text or symbols)

CHAIN SAW SAFETY

1 Make sure the Chain Saw is correctly assembled as instructed in the Assembly section of this manual.
2. Before each use, inspect the Chain Saw, replace damaged parts, and check for fuel leaks. Make sure all fasteners are in place and tightened securely.
3. Maintain the Chain Saw in accordance with the recommended maintenance intervals and procedures detailed in the "Saw chain Maintenance" and "Regular Maintenance".
4. Use the correct accessories. Never use replacement parts that are not approved by Maruyama.
5. Shut off the engine before performing maintenance or working on the machine.
6. If running problems or excessive vibration occur, stop immediately and inspect the unit for the cause. If servicing dealer for repair.
7. Never modify a chain saw in any way.

FUEL SAFETY

1 Gasoline is highly flammable and must be handled and stored carefully. Use a container approved for storing gasoline and/or fuel/oil mixture.
2. Mix and pour fuel outdoors and where there are no sparks or flames.
3. Do not smoke near fuel storage containers or the Chain Saw. Do not smoke while operating the Chain Saw.
4. Do not overfill the fuel tank. Stop filling 1/4-1/2inch (6mm-13mm) from the top of the tank.
5. Wipe up any spilled fuel before starting the engine.
6. Move the Chain Saw at least 10 feet (3m) away from the fueling location before starting the engine.
7. Do not remove the fuel tank cap while the engine is running or immediately after stopping the engine.
8. Allow the engine to cool before refueling.
9. Empty the fuel tank before storing the Chain Saw. Fuel should be emptied after each use as fuel remaining in the tank may leak during storage.
10. Store both fuel and the Chain Saw away from open flame, sparks and excessive heat. Make sure fuel vapors cannot reach sparks or open flames from heaters, furnaces, electric motors, etc.

Illustration of a fuel can with icons for liquid, gas, and pump (no text or labels)

WIPE UP ANY FUEL SPILLAGE

Fueling location 10 Feet Min. 3 m Starting the engine

OPERATING SAFETY

1 THIS CHAIN SAW CAN CAUSE SERIOUS INJURIES. Read the instructions carefully. Be familiar with all controls and the proper use of the Chain saw.
2. Avoid using the Chain saw near rocks, gravel, stones and similar materials which can become dangerous projectiles.
3. Keep the area of operation clear of all persons, particularly small children and pets.
4. If you are approached while operating the Chain saw, stop the engine.
5. Never allow children to operate the Chain saw.
6. Use the Chain saw only in daylight or adequate artificial lighting.
7. Never operate the Chain saw without proper guards or other protective safety devices in place.
8. Do not put hands or feet near any moving parts. Keep clear of hot surfaces such as the muffler.
9. Maintain a firm footing while operating the Chain saw.
10. Use the right tool for the job. Do not use the Chain saw for any job that is not recommended.
11. Know how to stop the machine quickly in an emergency. For information on how to stop the engine refer to the "STARTING AND STOPPING PROCEDURES".

OTHER SAFETY PRECAUTIONS VIBRATION

Prolonged use of chain saw exposing the operator to vibrations may produce white finger disease (Raynaud's phenomenon). This conditions reduce the hand's ability to feel and regulate temperature, produce numbness and burning sensations and may cause never and circulation damage and tissue necrosis.

All factors which contribute to white finger disease are not known, but cold weather, rainy weather, smoking and diseases or physical conditions that affect blood vessels and blood circulation, as well as high vibration levels and long periods of exposure to vibration are mentioned as factors in the development of white finger disease. In order to reduce the risk of white finger disease, please following clause.

• Select the appropriate work equipment the least possible vibration.
• Use the appropriate for guide bar to operation.
• Making a selection of protectors (protective clothing, gloves, foot protection, and etc.), please select durable light weight, and warm one.
• Massage the palms and arms of one's hands, on one's break and after operation.
  • Take frequent breaks.

IMPORTANT : Please be seen an academic doctor if you have dubitable symptom.

OTHER SAFETY PRECAUTIONS NOISE

• Chain saw noise may damage your hearing. Always wear hearing protection.
• Continual and regular users should have their hearing checked regularly.
• You may feel further fatigue under noisy condition compare to normal circumstances.

TRANSPORTATION

When transporting your chain saw, use the appropriate guide bar cover.

Carry the chain saw with the engine stopped.

Line drawing of a mechanical tool or device with internal components and a handle (no text or symbols)

Guide bar cover

ASSEMBLY

WARNING

POTENTIAL HAZARD

- Saw chain is sharp.

WHAT CAN HAPPEN

- Contact with the saw Chain can cause personal injury.

HOW TO AVOID THE HAZARD

• Wear gloves when you handle the saw chain.
  • Always stop the engine before performing any of the following operations.

MOUNTING THE GUIDE BAR AND CHAIN

1. Make sure the chain brake is released. Refer to "CHAIN BRAKE".
2. Unscrew the guide bar retaining nut and remove the chain case.
3. Attach the chain to the sprocket in the right direction first, then fit it in the bar groove of the guide bar.

Sprocket (inside) Bar hole Guide bar Saw chain

Tension adjuster Chain case Tension adjust screw

1. Make sure the chain brake is released.
2. Engage the rear part of the chain case with the hook on engine case, and fit the tension adjuster into the bar hole.

Reinstall the chain case on the engine case and screw on the guide bar retaining nut only finger tight.

Hook Chain case Nut

1. Turn the tension adjusting screw clockwise to increase tension.

2. While still holding the bar nose up, tighten down the nut firmly with using the supplied box spanner.

[Tightening torque]

1500\~2000 N·cm (153\~204kgf-cm)

When tightening with the supplied box spanner, hold the handle of the supplied box spanner and securely tighten the nut.

1. Tension is correct when the chain fits snugly against the bar and can still be pulled along the bar by hand.

If necessary, loosen the guide bar retaining nuts and readjust it.

Illustration of hands operating a mechanical device with a directional arrow indicating motion (no text or symbols present)

Guide bar

The chain fits snugly.

Line drawing of a mechanical assembly with hands operating a tool (no text or symbols)

INSTALLING THE SPIKED BUMPER (OPTION)

1. Make sure the chain brake is released. Refer to "CHAIN BRAKE".

2. Unscrew the nut and remove the chain case. Remove the saw chain and guide bar.

3. Remove the screw that attaches the guide plate. Remove the chain catcher and the guide plate.

4. Screw the spiked bumper onto the engine case with 2 screws and tighten to 300 \~ 400 N·cm (31 \~ 41kgf·cm).

5. Attach the guide plate with the guide plate retaining screw (M3) and the chain catcher retaining screw (M5). [Tightening torque]

M3:80\~120 N·cm (8.2\~12.2kgf-cm)

M5 : 300 \~ 400N·cm (31 \~ 41kgf·cm)

1. For mounting the guide bar and chain, refer to "MOUNTING THE GUIDE BAR AND CHAIN".

Chain case Nut

Chain catcher Guide plate

Technical line drawing of a mechanical assembly with no visible text or symbols

M3 M5

ASSEMBLY FORE-JUST

WARNING

POTENTIAL HAZARD

- Saw chain is sharp.

WHAT CAN HAPPEN

- Contact with the saw Chain can cause personal injury.

HOW TO AVOID THE HAZARD

• Wear gloves when you handle the saw chain.
  • Always stop the engine before performing any of the following operations.

MOUNTING THE GUIDE BAR AND CHAIN

Chain tensioning mechanism interlocked with front hand guard (e-JUST).

JUST MARUYAMA

fig.1 Sprocket (inside) White cap Guide bar Saw chain

fig.2 Hook Chain case Nut

1. Make sure the chain brake is released. Refer to "CHAIN BRAKE".
2. Unscrew the guide bar retaining nut and remove the chain case. (refer to fig.2)
3. Attach the chain to the sprocket in the right direction first, then fit it in the bar groove of the guide bar. Ensure that the white cap on the body fits into the bar hole provided for adjusting tension. (refer to fig.1)

1. Engage the rear part of the chain case with the hook on engine case, and fit the tension adjuster into the bar hole.

Reinstall the chain case on the engine case and Screw on the guide bar retaining nut only finger tight. (refer to fig.2)

fig.3 Front hand guard

1. Guide bar is moved forward and tension the chain along with pulling up the front hand guard. (refer to fig.3)

Guide bar The chain fits snugly.

1. Keeping the Front hand guard position, while still holding the bar nose up, tighten down the nut firmly with using the supplied box spanner. (refer to fig.4)

fig.4

[Tightening torque] 1500 \~ 2000N·cm {153 \~ 204kgf-cm}

When tightening with the supplied box spanner, hold the handle of the supplied box spanner and securely tighten the nut (refer to fig.4).

Check chain tension frequently. If necessary, retention the chain according to the following adjustment procedure. Especially just after installing a new chain, retention more frequently. New chains may stretch more during their initial use.

fig.5 Front hand guard

1. Loosen the guide bar retaining nut with using the supplied box spanner.

Guide bar is moved forward and tension the chain along with pulling up the front hand guard. (refer to fig.5)

1. While still holding the bar nose up, tighten down the nut firmly with using the supplied box spanner. (refer to fig.6)

[Tightening torque] 1500 \~ 2000N·cm {153 \~ 204kgf-cm}

Technical line drawing of a mechanical clamp or bracket assembly (no text or symbols)

When tightening with the supplied box spanner, hold the handle of the supplied box spanner and securely tighten the nut.

1. The tension of the chain is correct if the chain rests the bottom side of the guide bar and can still be easily turned by hand. If necessary, loosen the guide bar retaining nuts and readjust it.

BEFORE OPERATION

OIL AND FUEL

! DANGER

POTENTIAL HAZARD

- In certain conditions gasoline is extremely flammable and highly explosive.

WHAT CAN HAPPEN

- A fire or explosion from gasoline can burn you, others and cause property damage.

HOW TO AVOID THE HAZARD

- Use a funnel and fill the fuel tank outdoors, in an open area, when the engine is cold. Wipe up any gasoline that spills.

- Do not fill the fuel tank completely full. Add gasoline to the fuel tank until the level is 1/4" to 1/2" (6 mm to 13mm) below the bottom of the filler neck. This empty space in the tank allows gasoline to expand.

- Never smoke when handling gasoline, and stay away from an open flame or where gasoline fume may be ignited by a spark.

- Store gasoline in an approved container and keep it out of the reach of children.

- Never buy more than a 30-day supply of gasoline.

WARNING

POTENTIAL HAZARD

- Gasoline contains gasses that can build up pressure inside a fuel tank.

WHAT CAN HAPPEN

- Fuel can be sprayed on you when removing fuel tank cap.

HOW TO AVOID THE HAZARD

- Remove fuel tank cap slowly to avoid injury from fuel spray.

FUELING

⚠ WARNING The following precautions will lessen the risk of fire.

1. Do not smoke near fuel.

2. Mix and pour fuel outdoors and where there are no sparks or flames.

3. Always shut off the engine before refueling. Never remove the fuel tank cap while the engine is running or immediately after stopping the engine.

4. Always open the fuel tank cap slowly to release any possible pressure inside the tank.

5. Do not overfill the fuel tank. Stop filling 1/4-1/2inch (6mm-13mm) from the top of the tank.

6. Tighten the tank fuel cap carefully but firmly after refilling.

7. Wipe up any spilled fuel before starting the engine.

8. Move the Chain saw at least 10 feet (3m) away from the fueling location and fuel storage container before starting the engine.

Recommended Oil Type

Only use a two-cycle engine oil formulated for use in high-performance, air-cooled two-cycle engines.

Maruyama brand 2-cycle oil is formulated for use in high-performance, air-cooled two-cycle engines.

IMPORTANT: Do not use National Marine Manufacturer's Association (NMMA) or BIA certified oils. This type of 2-cycle engine oil does not have the proper additives for aircooled, 2-cycle engines and can cause engine damage. Do not use automotive motor oil. This type of oil does not have the proper additives for aircooled, 2-cycle engines and can cause engine damage.

Recommended Fuel Type

Use clean, fresh lead-free gasoline, including oxygenated or reformulated gasoline, with an octane rating of 85 or higher. To ensure freshness, purchase only the quantity of gasoline that can be used in 30 days.

Use of lead-free gasoline results in fewer combustion chamber deposits and longer spark plug life.

Use of premium grade fuel is not necessary or recommended.

Use Of Fuel Additives

IMPORTANT: NEVER USE METHANOL, GASOLINE CONTAINING METHANOL, GASOHOL CONTAINING MORE THAN 10% ETHANOL, PREMIUM GASOLINE, OR WHITE GAS BECAUSE ENGINE FUEL SYSTEM DAMAGE COULD RESULT.

DO NOT USE FUEL ADDITIVES OTHER THAN THOSE MANUFACTURED FOR FUEL STABILIZATION DURING STORAGE SUCH AS MARUYAMA'S STABILIZER/ CONDITIONER OR A SIMILAR PRODUCT. MARUYAMA'S STABILIZER/CONDITIONER IS A PETROLEUM DISTILLATE BASED CONDITIONER/STABILIZER.

MARUYAMA DOES NOT RECOMMEND STABILIZERS WITH AN ALCOHOL BASE SUCH AS ETHANOL, METHANOL OR ISOPROPYL. ADDITIVES SHOULD NOT BE USED TO TRY TO ENHANCE THE POWER OR PERFORMANCE OF MACHINE.

Mixing Gasoline And Oil

IMPORTANT: The engine used on this Chain Saw is of a 2-cycle design. The internal moving parts of the engine, i.e., crankshaft bearings, piston pin bearings and piston to cylinder wall contact surfaces, require oil mixed with the gasoline for lubrication.

Failure to add oil to the gasoline or failure to mix oil with the gasoline at the appropriate ratio will cause major engine damage which will void your warranty.

For your fuel premix, only use a quality oil designed for 2-cycle air cooled engines. Maruyama 50:1 2-cycle Oil is formulated to meet the requirements of high-performance, air-cooled two-cycle engines.

Fuel Mixture

The fuel: oil ratio is 50 parts gasoline to 1 part oil or 50:1.

日+ 50:1

Note: Never use a mixing ratio less than 50:1 regardless of the oil package mixing instructions. Ratios less than 50:1, (for example, 60:1, 80:1, 100:1), reduce the amount of lubrication to the internal moving parts of the engine and can cause damage.

Fuel Mixture Chart

Gasoline 50:1 2-cycle oil
1 gallon 2.6 oz.
2 gallons 5.1 oz.
5 gallons 12.8 oz.

1 litre 20ml
5 litre 100ml

Mixing Instructions

IMPORTANT: Never mix gasoline and oil directly in the Chain Saw fuel tank.

1. Always mix fuel and oil in a clean container approved for gasoline.
2. Mark the container to identify it as fuel mix for the Chain Saw.
3. Use regular unleaded gasoline and fill the container with half the required amount of gasoline.
4. Pour the correct amount of oil into the container then add the remaining amount of gasoline.
5. Close the container tightly and shake it momentarily to evenly mix the oil and the gasoline before filling the fuel tank on the Chain Saw.
6. When refilling the Chain Saw fuel tank, clean around the fuel tank cap to prevent dirt and debris from entering the tank during cap removal.
7. Always shake the premix fuel container momentarily before filling the fuel tank.
8. Always use a spout or funnel when fueling to reduce fuel spillage.
9. Fill the tank only to within 1/4-1/2 inch (6 mm-13 mm) from the top of the tank. Avoid filling to the top of the tank filler neck.

STARTING AND STOPPING PROCEDURE

WARNING

- Do not start engine before chain brake is activated.

CAUTION

- Do not increase engine speed with the chain brake engaged. This may cause excessive heat to covers or damage to the clutch.

BEFORE STARTING THE ENGINE

1. Fill the fuel tank as instructed in the Before Operation section of this manual.
2. Rest the chain saw on the ground.
3. Make sure the area is clear of any broken glass, nails, wire, rocks or other debris.
4. Keep all bystanders, children and animals away from the working area.

COLD STARTING PROCEDURE

1. Lock the chain by pushing the hand guard forward. Always engage the chain brake before starting the chain saw.

Front hand guard Chain stop

1. Turn on the ignition switch, which is located on the front part of the rear handle, to the start position ("—").

Ignition switch

Line drawing of a human head and neck with a circular object on the shoulder (no text or symbols)

Technical line drawing of a mechanical component with an upward arrow indicator (no text or symbols)

1. Push the primer pump until fuel enters into the primer pump (5 - 6 times).

2. Pull the choke knob to the extended position.

This makes the choke valve closed and sets the throttle trigger to the start position.

1. Place the chainsaw on the ground and hold the front handle firmly with your left hand. Kneel with your right knee on the frame and pull the starter grip with your right hand.

2. If the engine stalls after the first firing, push the chock knob back in and pull the starter grip again.

3. After the engine is started, immediately squeeze and release the throttle trigger to allow it to return to the idle position.

4. After the engine starts, pull the hand guard toward the handle to disengage the chain brake.

Do not increase engine speed with the chain brake engaged.

This may cause excessive heat to covers or damage to the clutch.

1. If the engine stalls at low speed, refer to "CARBURETTOR ADJUSTMENT" in Regular maintenance.

Primer pump

Choke knob

Line drawing of a person using a power tool to cut a piece of material (no text or symbols present)

Front hand guard Release the chain break

HOT RESTART

To start the engine that is already warmed up (hot restart), or if the ambient temperature exceeds 20^ C:

1. Turn on the ignition switch, which is located on the front part of the rear handle, to the Start position.

2. Push the primer pump until fuel enters into the primer pump (5 - 6 times).
   Pushing the primer pump is not needed to restart warm engine with enough fuel in tank.

3. Pull the starter grip.

4. If the engine fails to start after three to four pulls, follow the instructions in the Cold Starting Procedure section above.

If the engine fails to start after you follow the above procedures, contact an authorized MARUYAMA dealer.

NOTE: 1. Don't pull the starter cord out completely.

1. Don't release the starter cord from the fully extended position.

TO STOP THE ENGINE

1. Release the throttle trigger.
2. Turn off the stop switch to the stop position ("O").

Technical line drawing of a mechanical component with a downward arrow indicating direction (no text or symbols)

NOTE: In the case that engine does not stop at “○” position, pull the “CHOKE KNOB” to stop engine. Pay attention to the chain that starts to turn by pulling “CHIKE KNOB” during engine runs. Please check your chainsaw at authorized service dealer immediately.

OILER ADJUSTMENT

CHAIN LUBRICATION TEST

1. Hold the chain just above a dry surface
2. Open the throttle to half
3. Oil should be seen on the surface.

Simple line drawing of a manual tool emitting particles from a surface (no text or symbols)

Minus screw driver DECREASE INCREASE

To increase the delivery volume, turn adjusting screw anticlockwise.

CHAIN ADJUSTMENT

If your Chain Saw has the e-just chain tensioning mechanism, refer to CHAIN ADJUSTNENT FOR e-JUST.

1. Make sure the chain brake is released.
2. Loosen the nut counterclockwise using the supplied box spanner, then tighten the nut only finger tight.
3. Turn the tension adjusting screw clockwise to increase tension.
4. While still holding the bar nose up, tighten down the nut firmly with using the supplied box spanner.

[Tightening torque]

1500\~2000 N·cm (153\~204kgf-cm)

When tightening with the supplied box spanner, hold the handle of the supplied box spanner and securely tighten the nut.

1. Tension is correct when the chain fits snugly against the bar and can still be pulled along the bar by hand. If necessary, loosen the guide bar retaining nuts and readjust it.

Technical illustration showing hands using a tool to adjust or install a mechanical component, with no visible text or symbols.

Guide bar

The chain fits snugly

CHAIN BRAKE

CAUTION

• Check operation of chain brake before starting chainsaw. If the chain brake does not function properly, take the saw to your local Service Center.
• If the brake is tripped by kick back reaction, the chain will stop. Immediately release the throttle to avoid possible damage to the engine or clutch. Do not attempt to operate the engine with the brake engaged.

- Chain brake is the device to stop the rotation of the chain if activated in a kickback situation.

- When the front guard is pushed forward, chain brake instantly works to stop the chain.

- When the front guard is fully pulled toward the handle, brake is released.

Front hand guard Chain stop

Front hand guard Release the chain brake

1. Place the chain saw on the ground.
2. Hold the handle with both hands and accelerate the engine to high speed by using the throttle trigger.
3. Operate the chain brake by turning your left wrist against the front hand guard whilst gripping the front handle.
4. The chain stop immediately.
5. Release the throttle trigger.
6. If the chain brake does not function properly, take the saw to your local Service Center.

CHECKING THE NON-MANUAL CHAIN BRAKE

1. Stop the engine of the chain saw.

2. Operate the front and rear handles with hands, so that the chain saw may be placed at the height of about 0 \~15cm as shown in Fig.

3. Softly detach the left hand from the front handle, and touch the end of the guide bar against the log or the like placed below so that the machine receives an impact.

Do not let your hand off from the rear handle.

1. The brake should activate when the guide bar hits the log.

2. If the chain brake does not function properly, take the saw to your local Service Center.

0~15cm

CUTTING INSTRUCTION

CAUTION

• Read the Safety instructions beginning on page 13 concerning proper use of the Chain saw.
  • Always wear gloves and protective clothing when operating the Chain saw.
• Felling a tree requires knowledge and experience, especially in a case of felling a large diameter tree or cutting on steep slopes or unstable ground. Please seek the advice of a real expert before attempting to fell a tree.
• Before attempting to fell a tree, cut some small logs or limbs to practice of the Chain saw operations.
• Apply only light pressure while running the engine at full throttle constantly.
• If the chain is properly sharpened, the cutting should be relatively effortless. Replace the chain or sharpen it.
• If the saw pinches during cutting operation, stop the engine and insert a wedge to remove it.
• Do not let any person use your saw unless he has read this manual and fully understands its instruction.
• Use chain saw only to cut wood or wood products.

HOLDING THE SAW

With both hands, keep a good, firm grip on the saw.

The right hand should be on the rear handle, and the left hand on the front handle.

Illustration showing a person using a chain mill machine to cut a saw and cut a tree ring, with no visible text or symbols.

APPROPRIATE USE OF SPIKED BUMPER

Engage the spiked bumper firmly in the wood and pivot the saw around this contact point.

Technical line drawing of a mechanical tool with rotating blades and a chain (no text or symbols)

A: Wedges

KICKBACK SAFETY PRECAUTION

KICKBACK PHENOMENON:

If the upper quadrant of the tip of the bar touches any object, the reaction of the chain may drive the saw rapidly straight back toward the operator. Do not cut limbs with the nose of the guide bar.

Kickback zone

DANGER

POTENTIAL HAZARD

- Kickback may occur when the nose or tip of the guide bar touches an object.

WHAT CAN HAPPEN

- If the upper quadrant of the tip of the bar touches any object, the reaction of the chain may drive the saw rapidly straight back toward the operator

HOW TO AVOID THE HAZARD

• Hold the chainsaw firmly with both hands.
• Begin cutting and continue at full throttle.
• Do not cut limbs with the nose of the guide bar.
• Do not overreach.
• Cut only one log at a time.
• Do not cut above chest height.
  It is difficult to maintain control of saw above chest height.
• Use extreme caution when reentering a previous cut.
• Cut with a correctly sharpened, properly tensioned chain at all times.
• Depth gauges are critical to safe chain operation.
• Use appropriate low kickback type of saw chain.

WARNING

It is important to file the saw chain to the correct depth and angle. Improper lowering or sharpening of the depth gauges may increase the risk of kickback injury.

PULL-IN: Pull-in occurs when the chain on the bottom of the bar is suddenly stopped when it is pinched or caught in the wood.

The reaction of the chain pulls the saw forward.

Always cut with the spiked bumper in contact with the wood.

PUSH BACK: Pushback occurs when the chain on the top of the bar is suddenly stopped when it is pinched or caught in the wood.

The reaction of the chain drives the saw straight back toward the operator.

Watch the cut and the log for any movement that may pinch the chain.

Illustration of hands operating a chain-linking machine (no text or symbols)

PULL IN PUSH BACK

Illustration of hands operating a chain mill with a gear and a circular cutter (no text or symbols)

Bouncing: Bouncing occurs when the saw chain contact with wood.

The reaction of the saw is bouncing on the wood.

Hold the chain saw firmly with both hands, Apply only light pressure while running the engine at full throttle constantly.

DANGER

- There are a number of factors that may affect the intended direction of fall and be alert for a change in direction while the tree is falling.

CAUTION

- If the saw begins to pinch during the backcut operation, insert a wedge to open the cut and remove it.

• Before felling a tree, consider carefully all conditions, including lean of tree, sloping ground, wind, wood structure which may affect the direction of fall.

• Before cutting, clear the area around the tree. You will need good footing while working and select a path of retreat.

• Cut a notch on the side to which the tree is to fall.

• Cut to a depth of 1/3 of the trunk diameter.

• Remove resulting 45-degree piece.

• Cut horizontally on the side opposite the notch and at level about 5cm above the bottom of the notch.

(Backcut)

• The remaining wood between the notch and backcut

• Will act as a hinge when the tree falls, guiding it in the desired direction.

• When the tree starts to fall, kill the engine, place the saw on the ground and make your retreat quickly

Felling direction Notch 45° 1/10 1/3 Back cut 2.5 - 5cm

FELL BIG TREE

• To fell big trees with a diameter exceeding twice the bar length, start the notching cuts from one side and draw the saw through to the other side of the notch.
• Start the back cut on one side of the tree with the spiked bumper engaged, pivoting the saw through to from the desired hinge on that side.
• Then remove the saw for the second cut.
• Insert the saw in the first cut very carefully so as not to cause kickback.
• The final cut is made by drawing the saw forward in the cut to reach the hinge.

1 2 3 4 5 A: Wedges

CAUTION

• Don't saw above chest height.
  • Always use both hands.
• Stay on the uphill side of logs.
• Don't let anyone hold wood for you to cut.
• Saw wrongly held too close to operator's body.
• Cutting while on a ladder is extremely dangerous because the ladder can slip and your control of the chain saw is limited.
• Never operate chain saw without rope-harness on climbing a tree.

WARNING

Do not put pressure on the saw when reaching the end of a cut. The pressure may cause the bar and rotating chain to pop out of the cut or kerf, go out of control and strike the operator or some other object. If the rotating chain strikes some other object, a reactive force may cause the moving chain to strike the operator.

Limbing Cut from the upside From the bottom 1/3 cut.

Bucking ① From the upside 1/3 cut ② Cut from the bottom

• To make sure ground safety, doing work.
- When limbing, cut using a porting of the root of the guide bar. If the tip of the guide bar touches wood, the guide bar kicks back in an instant.
- Bucking is the sawing of a log or fallen tree into smaller pieces.
- When you cut, wood cutting order considering to open cut.

Illustration showing five different logging techniques with no symbols indicating prohibition or prohibition of a machine.

Following is a list of recommended cutting equipment for the Maruyama chain saw models MCV31R.

The combinations of power equipment, guide bar and saw chain have been tested and found to be in accordance with the kickback and vibration requirements of ANSI B175.1–2000.

The guide bar nose radius is determined by either the maximum number of teeth in the nose sprocket or the corresponding maximum nose radius of a solid bar.

The following list is Maruyama's recommendations. There may be other combinations available, which will also achieve kickback reduction.

As we are listing the maximum guide bar nose radius, you may use a guide bar with smaller nose radius than in our list. For guide bars of the same length, all sprocket-nose guide bars of the same pitch and having the same number of sprocket teeth may be considered to have equivalent kickback energy.

When replacing the saw chain, identify the type of chain with the drive links mark.

The following combinations may be used on MCV31R.

LOW-KICKBAKCK SAW CHAIN
Type of chain Chain P/N Drive link number Pitch Gauge Drive link mark
Oregon 91PX	91PX045E91PX052E	45 (12 inch bar)52 (14 inch bar)	3/8 inch(9.53mm)	0.050 inch(1.27mm)

LOW-KICKBAKCK GUIDE BAR
Type of bar Bar	P/N Length Pitch			Thickness of drive links	Max. number of teeth in the nose sprocket
Oregon Double Guard	120SDEA041140SDEA041	12 inch14 inch	3/8 inch(9.53mm)	0.050 inch(1.27mm)	7

Round file

4.0mm(5/32inch)

Right hand cutter Depth gauge Left hand cutter Rivet Drive link Tie strap

Low-kickback saw chain is chain that has met the kickback performance requirements of ANSI B 175.1 - 2000(current revision of standard) (American National Standard for Power Tools-Gasoline-Powered Chain Saws-Safety Requirements) when tested on the representative sample of chain saws below 3.8 c.i.d. specified in ANSI B 175.1- 2000(current revision of standard).

WARNING

• Switch off the engine before sharpening the saw chain.
  • Always wear gloves when working on saw chain.
• It is important to file the saw chain to the correct depth and angle. Improper lowering or sharpening of the depth gauges may increase the risk of kickback injury.

Sharpening

The saw chain should be sharpened once a day.

1. Lock the chain.
2. The saw chain have alternative left and right hand cutters. Always sharpen from the inside out.
3. Keep the file to the angle lines of the top plate angle.
4. Hold the file horizontally.

Depth gauge adjustment

The depth control determines the thickness of wood chip produced and must be maintained correctly throughout the chain life.

As the cutter length is reduced, the depth control height is altered and must be reduced.

1. Position the depth gauge, and file off any of the depth control which protrudes.
2. Round off the front of the depth control to allow smooth cutting.
3. Keep the Lower edge of the drive link sharp. (Drive link serves to remove sawdust from the groove of the guide bar.)

GUIDE BAR

• Clean before using
  Clean the groove of the guide bar with a small screw driver or a wire.
  Clean oil holes with a wire.
• Reverse guide bar periodically.
• Check sprocket and the clutch.
• Clean the bar mount area before installation of the guide bar.

NOTE: Use appropriate low kickback type of saw chain. When replacing guide bar or saw chain, ask any local authorized MARUYAMA dealer.

REGULAR MAINTENANCE

Maintenance, replacement or repair of emission control devices and systems may be performed by any repair establishment or individual; however, warranty repairs must be performed by a dealer or service center authorized by Maruyama Manufacturing Company, Inc. The use of parts that are not equivalent in performance and durability to authorized parts may impair the effectiveness of the emission control system and may have a bearing on the outcome of a warranty claim.

WARNING

• Switch off the engine before sharpening the saw chain.
  • Always wear gloves when working on saw chain.
• When replacing guide bar or saw chain, Use appropriate low kickback type.
• Never modify a chain saw in any way. Although certain unauthorized attachments are useable with the chain saw, their use may, in fact, be extremely dangerous.

AIR FILTER

Maintenance Interval

• The air filter should be cleaned daily, or more often when working in extremely dusty conditions.
• Replace after every 100 hours of operation.

Air Filter Cleaning

1. Remove the Cleaner cover from the chain saw.
2. Remove the element from the Cleaner cover.
3. Brush off dust on the element or blow off dust with compressed air.
4. Reassemble the element and Cleaner cover.

CHAIN CASE

Maintenance Interval

• The chain case should be cleaned daily, or more often when working in extremely dusty conditions.
• When chain brake does not function properly, should be cleaned.
• Clean the bar mount area before mounting of the chain case.

IMPORTANT: After clean, if the chain brake does not function properly, take the saw to your local Service Center.

Remove the Cleaner cover Element

Technical line drawing of a mechanical assembly with internal components (no text or symbols)

SPARK PLUG

Maintenance Interval

• The spark plug should be removed from the engine and checked after each 25 hours of operation.
• Replace the spark plug after every 100 hours of operation.

Spark Plug Maintenance

1. With the engine at ambient (room) temperature, twists the high tension lead boot on the spark plug back and forth a couple of times to loosen the boot, and then pull the boot off of the spark plug.
2. Remove the spark plug.
3. Clean the electrodes with a stiff brush.
4. Adjust the electrode air gap to 0.6-0.7 mm (0.024-0.028 in).
5. Replace the spark plug if it is oil-fouled, damaged, or if the electrodes are worn down.
6. Do not over tighten the spark plug when installing. The tightening torque is 10.7-16.6 N·m (95-148 in. lbs).

SPROCKET

Maintenance Interval

- The sprocket should be cleaned and inspected for damage after each 25 hours of operation, or when you install new chain.

SPROCKET CLEANING AND INSPECTED

• The clutch should be cleaned and inspected for damage.
• The damaged sprocket will premature damage or wear of saw chain.
• When the sprocket has worn out 0.5mm or more, replace it.

SPROCKET	PITCH TEETH
	3/8 6

Spark plug

TIPS 0.6 - 0.7 mm (0.024 - 0.028 inches)

0.5 mm

FUEL FILTER

Maintenance Interval

- The fuel filter should be cleaned and inspected for damage after each 25 hours of operation. - The fuel filter should be replaced after every 100 hours of operation.

Fuel Filter Replacement

The fuel filter is attached to the end of the fuel pick-up hose inside the fuel tank.

To replace the fuel filter:

1. Make sure the fuel tank is empty.
2. Remove the fuel cap.
3. Using a wire hook, gently pull the fuel filter out through the fuel filler opening.

Wire Fuel filter Fuel pick-up hose

1. Grasp the fuel hose next to the fuel filter fitting and remove the filter, but do not release the hose.

2. While still holding on to the fuel hose, attach the new fuel filter.

3. Drop the new fuel filter back into the guide bar side of the fuel tank.

4. Make sure that the fuel filter is not stuck in a corner of the tank, and that the fuel hose is not doubled over (kinked) before refueling.

OIL FILTER

Maintenance Interval

- The oil filter should be cleaned and inspected for damage after each 25 hours of operation.

Oil Filter Cleaning

The oil filter is attached to the end of the oil pick-up hose inside the oil tank.

To clean the oil filter:

1. Make sure the oil tank is empty.
2. Remove the oil cap.
3. Using a wire hook, gently pull the oil filter out through the oil filler opening.
4. Grasp the oil hose next to the oil filter fitting and clean the oil filter.
5. Drop the oil filter back into the guide bar side of the oil tank.
6. Make sure that the oil filter is not stuck in a corner of the tank, and that the oil hose is not doubled over (kinked) before refueling.

Wire Oil filter

Oil pick-up hose

ENGINE COOLING

Maintenance Interval

• The engine cooling should be cleaned after every 25 hours of operation, or once a week, whichever comes first.
• Air must flow freely around and through the cylinder cooling fins to prevent engine overheating. Leaves, grass, dirt and debris buildup on the fins will increase the operating temperature of the engine, which can reduce engine performance and shorten engine life.

Cooling Fin Cleaning

Clean all dirt and debris from around the cooling air intake.

Cooling air intake

MUFFLER (SILENCER)

Maintenance Interval

The muffler should be inspected and cleaned after each 100 hours of use.

CAUTION

- Be careful not to allow any dirt or debris to fall into the exhaust port, as this can cause engine damage.

Muffler Maintenance

1. With the engine at ambient (room) temperature, loosen the nut and remove the chain case.
2. Remove the two screws, and remove the Muffler.
3. Clean the muffler with a stiff brush.
4. Reinstall the muffler, then reinstall and tighten the two screws.
5. Reinstall the Chain case.

Muffler body Muffler cover Screws Plate Gasket

WARNING

POTENTIAL HAZARD

- Muffler surface becomes hot when Chain Saw is in operation and remains hot for some time after the engine is shut off.

WHAT CAN HAPPEN

- Contact with hot muffler surface could cause a burn.

HOW TO AVOID THE HAZARD

- Make sure the muffler is cool before inspecting and cleaning the spark arrester.

Maintenance Interval

• The spark arrester should be inspected and cleaned after every 25 hours of use.
• Replace the screen if it cannot be thoroughly cleaned, or if it is damaged.

Spark Arrester Maintenance

1. With the engine at ambient (room) temperature.
2. Remove the two screws retaining the muffler.
3. Remove and clean the tail, gasket and spark arrester with a safety solvent and a stiff brush. If any part cannot be thoroughly cleaned, it must be replaced.
4. Reinstall the spark arrester and muffler, then reinstall and tighten the two screws.

Plate (Spark arrester)

GENERAL CLEANING AND TIGHTENING

WARNING

POTENTIAL HAZARD

• When engine is running, attached tool and other parts are moving.
• Contact with moving tool or other moving parts could cause serious personal injury or death.
  • Always turn off your Chain saw before you clean or perform any maintenance on it.

WHAT CAN HAPPEN

HOW TO AVOID THE HAZARD

The Maruyama Chain saw will provide maximum performance for many, many hours if it is maintained properly. Good maintenance includes regular checking of all fasteners for correct tightness, and cleaning the entire machine.

CARBURETTOR ADJUSTMENT

WARNING

POTENTIAL HAZARD

• Engine must be running to make carburetor adjustments.
• When engine is running, saw chain are moving.

WHAT CAN HAPPEN

- Contact with moving parts could cause serious personal injury or death.

HOW TO AVOID THE HAZARD

• Keep hands, feet and clothing away from moving parts.
• Keep all bystanders and pets away from unit while making carburetor adjustments.

WARNING

• Idle speed adjustment should be checked each time the unit is operated.
• Wear the recommended personal protective equipment and observe all safety instructions.

Engine Idle Speed:

To adjust the engine idle speed, rotate the idle speed adjuster screw on the carburetor.

• Turn the idle speed adjuster screw in (clockwise) to increase the engine idle speed.
• Turn the idle speed adjuster screw out (counterclockwise) to decrease the engine idle speed.

Fuel mixtures adjust:

Do not adjust the carburetor unless necessary.

To adjust the carburetor proceed as follows

Idle speed adjuster screw (T) Low speed mixture adjuusuter (L) High speed mixture adjuster (H)

1. Turn the low speed mixture adjuster (L) and high speed mixture adjuster (H) anticlockwise to stop.
2. Start engine and allow it to run at idle until warm.
3. Turn idle speed adjuster screw (T) anticlockwise until the saw chain stops moving.
4. Accelerate to full throttle to check for smooth transition from idle to full throttle.
5. Turn the low speed mixture adjuster (L) and high speed mixture adjuster (H) clockwise to adjust for smooth transition from idle to full throttle.

CAUTION

• When starting, idle speed adjuster (T) should be adjusted not to rotate the saw chain.
• If idle speed adjustment is necessary, and after adjustment the engine stalls, stop using the Chain saw immediately!
• Contact your local authorized Maruyama Dealer for assistance and servicing.

STORAGE

WARNING

POTENTIAL HAZARD

• Gasoline contains gasses that can build up pressure inside a fuel tank.
• fuel can be sprayed on you when removing fuel tank cap.
• Remove fuel tank cap slowly to avoid injury from fuel spray.

WHAT CAN HAPPEN

HOW TO AVOID THE HAZARD

WARNING

POTENTIAL HAZARD

- Saw chain is sharp.

WHAT CAN HAPPEN

- Contact with the saw Chain can cause personal injury.

HOW TO AVOID THE HAZARD

- Wear gloves when you handle the saw chain.

CAUTION

POTENTIAL HAZARD

• Oil may squirt out of the spark plug opening when you pull the starter grip.
• Oil can cause eye injuries.
• Protect your eyes and keep your face away from the spark plug opening.

WHAT CAN HAPPEN

HOW TO AVOID THE HAZARD

For long term storage of the chain saw :

1. Empty the fuel tank into a suitable fuel storage container approved for gasoline.
2. Pump the primer bulb on the carburetor until all fuel is discharged through the clear Primer pump.
3. Run the engine to remove any fuel that may remain in the carburetor.
4. Perform all regular maintenance procedures and any needed repairs.
5. Remove the spark plug and squirt a very small amount of oil into the cylinder.
6. Pull the starter grip once.
7. Slowly pull the starter grip to bring the piston to the top of the cylinder (TDC).
8. Reinstall the spark plug.
9. Store the Chain saw in a dry place away from excessive heat, sparks or open flame.
10. Always use a guide bar cover when carrying or storage a chain saw.

TROUBLESHOOTING

Problema Cause Action
Engine Will Not Start	STOP switch to off positionElectrical problemEmpty fuel tankPrimer bulb wasn’t pushed enoughFuel filter cloggedFuel line cloggedCarburetorEngine flooded	Move switch to on positionAsk your MARUYAMA dealerFill fuel tankPress primer bulb until fuel flows Through fuel primer bulbClean or replaceCleanAsk your MARUYAMA dealerUse warm engine starting procedure
Engine lacks Power or Dropped down	Dirty air filterFuel filter cloggedFuel mixture is too richClogged exhaust portSpark plugCooling system plugged	Clean or replace air filterClean or replaceOpen choke, adjust carburetor, ask your MARUYAMA dealerClean exhaust portClean and adjust or replaceClean

If further assistance is required, contact your local authorized Maruyama service dealer.

MAINTENANCE PERIOD

	Maintenance	Before use	Daily	Every Every
				25 hours	50 hours	100 hours
	Check and replenish fuel	○
	Check for fuel leakage	○
■	Check and clean fuel filter			○
	Check and replenish oil	○
■	Check and clean oil filter			○
	Check bolts, nuts and screws for tightness or missing	○
	Tighten bolts and nuts	○
	Check engine idle speed adjustment	○
■	Clean air filter element		○
■	Remove dust and dirt for cooling air intake		○
	Clean spark plug and adjust electrode gap			○
●	Remove carbon deposits in exhaust port					○
●	Remove carbon deposits on piston head and combustion chamber					○
●	Remove carbon deposits in transfer ports					○
●	Clean spark arrester			○
	Replace fuel filter					○
	Check chain brake	○
	Check sprocket			○
	Check and clean Guide bar	○
	Check antivibration device ( rubber, spring )	○
	Check chain catcher	○
	Sharpening saw chain		○
	Replace fuel tube, fuel tank cap gasket It is recommended to replace every 3 years

● :Service to be performed by an authorized Maruyama engine dealer.

■ :Service more frequently under dusty conditions.

NOTE:

The service intervals indicated are to be used as a guide.

Service to be performed more frequently as necessary depending on operating condition.

Use Maruyama standard 50:1 two-cycle engine oil.

MARUYAMA®

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

THE AIR INDEX OF THIS ENGINE IS 3 0 2 4 6 8 10 MOST CLEAN LEAST CLEAN NOTE:THE LOWER THE AIR INDEX, THE LESS POLLUTION. THIS ENGINE IS CERTIFIED TO BE EMISSIONS COMPLIANT FOR THE USE:EXTENDED: 300HOURS CHECK THE OWNER'S MANUAL FOR FURTHER DETAILS.

MCV31R

Simple line drawing of a curved, elongated object with no text or symbols

#287161 #285188 WARNING OPERATION OF THIS EQUIPMENT MAY CREATE SPARKS THAT CAN START FIRES AROUND DRY VEGETATION. A SPARK ABRESTOR MAY BE REQUIRED. THE OPERATOR SHOULD CONTACT LOCAL FIRE AGENCIES FOR LAWS OR REGULATIONS RELATING TO FIRE PREVENTION REQUIREMENTS. TO AVOID KICKBACK Both of the operator's hands must be used to operate the chain saw. Contact of the guide bar tip with any object should be avoided. Tip contact may cause the guide bar to move suddenly upward and backwa- rd, which may cause serious injury. 272016 #272016 MARLNAMA MCV31R MADE M JAPAN #272806 GUIDE BAR CHAIN REPLACEMENT BAR AND CHAIN P/N ORECON P/N ORECON Note: For the details of guide bar and saw chain combinations. see the instruction manual. 12' 120SDEA041 91PX045E There may be other replacement components for achieving kickback protection. 14' 140SDEA041 91PX052E 272019

A*12345 Número de serie DE AIR LOCK IF 300 ENGINE IS 2 NO. 2 4 6 8 10 WEI CLEAN WE LE WMER TO LCK POURING THIS SHAP IT CONTINED TO BE TAKING CONE LUNT OVER THE USE EXTERIOR ANNUAL BACK WE OPEN MANUAL FOR FAIRER ITEMS. For more information. Visit us on the web at www.maruyasa-us.com #282631 WARNING: Read and follow all safety precautions in the instruction manual. Failure to follow instructions could result in serious personal injury. 272017

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Abstract black-and-white graphic of a stylized human figure with patterned head and torso (no text or symbols)

Illustration of a fuel can with icons for liquid, oil, and gas (no text or labels)

LIMPIE EL COMBUSTIBLE DERRAMADO

Technical line drawing of a mechanical tool or clamp device (no text or symbols present)

Protector de espada

MONTAJE

ADVERTENCIA

RIESGO POTENCIAL

Illustration of hands operating a mechanical device with a ruler and arrow indicating measurement (no text or symbols present)

Espada

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Technical line drawing of a mechanical assembly with no visible text or symbols

M3 M5

MONTAJE PARA e -JUST

ADVERTENCIA

RIESGO POTENCIAL

JUST MARLYAMA

fig.1 Piñón (interior) Tapa blanca Espada Cadena

Technical line drawing of a mechanical assembly with no visible text or symbols

Technical line drawing of a mechanical clamp or bracket assembly (no text or symbols)

Line drawing of a mechanical component with a circular feature and surrounding parts (no text or symbols)

Diagram of a camera lens with an upward arrow indicating direction (no text or symbols)

Line drawing of a person using a chain-linking tool to lift a piece of material (no text or symbols)

Technical line drawing of a mechanical component with a downward arrow indicating direction (no text or symbols)

Simple line drawing of a manual tool emitting powder from a surface (no text or symbols)

Destornillador plano REDUCIR AUMENTAR

Technical illustration showing hands operating a mechanical device with a chain, no text or symbols present

Espada

Illustration of hands operating a mechanical device with tools (no text or symbols visible)

Illustration of a person using a chain-linking machine with a circular gear and a prohibition symbol (no text or labels)

Technical line drawing of a mechanical tool with a blade and gear assembly (no text or symbols)

A: Cuñas

Illustration of a manual chain saw cutting a tree stump, with hands operating the cutter (no text or symbols present)

Illustration showing five different logging or mining techniques with no symbols indicating prohibition or prohibition of a machine.

MANTENIMIENTO DE LA CADENA

Technical line drawing of a mechanical assembly with internal components (no text or symbols)

BUJÍA

CÓMO SOLUCIONAR PROBLEMAS

The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

THE AIR INDEX OF THIS ENGINE IS 3 0 2 4 6 8 10 MOST CLEAN LEAST CLEAN NOTE:THE LOWER THE AIR INDEX, THE LESS POLLUTION THIS ENGINE IS CERTIFIED TO BE EMISSIONS COMPLIANT FOR THE USE:EXTENDED: 300HOURS CHECK THE OWNER'S MANUAL FOR FURTHER DETAILS.

MCV31R

DÉCLARATION DE GARANTIE DU CONTRÔLE DES ÉMISSIONS DE L'ÉTAT FÉDÉRAL. DROITS ET OBLIGATIONS DÉRIVÉS DE LA GARANTIE

Simple line drawing of a curved, elongated object with internal lines (no text or symbols)

#287161 #285188 TO AVOID KICKBACK Both of the operator's hands must be used to operate the chain saw. Contact of the guide bar tip with any object should be avoided. Tip contact may cause the guide bar to move suddenly upward and backward, which may cause serious injury. 272016 #272016 #272806 MARLNAMA MCV31R MADE IN JAPAN GUIDE BAR CHAIN REPLACEMENT BAR AND CHAIN P/N OREGON P/N OREGON 12' 120SDEA041 91PX045E Note: For the details of guide bar and saw chain combinations, see the instruction manual. 14' 140SDEA041 91PX052E There may be other replacement components for achieving kickback protection. 272019 #272019

A*12345 Numero de série #272017 WARNING: Read and follow all safety precautions in the instruction manual. Failure to follow instructions could result in serious personal injury. 272017 BEC AS INDEX IF THIS ROUTE IS 2 0 2 4 6 8 10 MOST CLEAR LEASTI CLEAR BEVE LIME WE LET INSIDE TO USE MUSION THIS NAME IT CONTINED TO BE REPRODUCED CONE LIME OVER THE SET EXTENDED, MINIMUMS BEET THE OVERTY MANUAL FOR PATHER RESULTS For more information. Visit us on the web at www.maruyana-us.com #282631

EXPLICATION DES SYMBOLES

Line drawing of a person in uniform with helmet and boots (no text or symbols)

Abstract black-and-white graphic of a stylized human figure with patterned head and torso (no text or symbols)

Illustration of a fuel can with icons for liquid, oil, and gas (no text or labels)

NETTOYER LE CARBURANT RENVERSÉ

Line drawing of a mechanical tool with a handle and internal gear (no text or symbols)

Illustration of hands operating a mechanical device with a ruler and gear (no text or symbols visible)

Line drawing of a hand operating a mechanical clamp or fixture with a rotating arrow (no text or symbols)

INSTALLATION DE LA GRIFFE D'ABATTAGE (EN OPTION)

M3:80\~120 N·cm (8,2\~12,2kgf-cm)

M5:300\~400N·cm (31\~41kgf-cm)

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M3 M5

MONTAGE POUR e-JUST

AVERTISSEMENT

RISQUE POTENTIEL

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Technical line drawing of a mechanical clamp or bracket assembly (no text or symbols)

AVANT D'UTILISER L'APPAREIL

HUILE ET CARBURANT

! DANGER

RISQUE POTENTIEL

Line drawing of a hand holding a small object with a spiral-like feature, no text or symbols present

Technical line drawing of a mechanical component with an upward arrow indicator (no text or symbols)

Line drawing of a person using a power tool to cut a piece of material (no text or symbols present)

Technical line drawing of a mechanical component with a hexagonal nut and circular features, showing a downward arrow (no text or symbols)

Simple line drawing of a chain-linker emitting exhaust smoke (no text or symbols)

Tournevis plat RÉDUIRE AUGMENTER

Technical illustration showing hands operating a mechanical component with a chain, no text or symbols present

FREIN DE LA CHAÎNE

PRÉCAUTION

Illustration showing a person using a chain-linking machine with a prohibition symbol (no text or labels present)

UTILISATION CORRECTE DE LA GRIFFE D'ABBATAGE

Technical line drawing of a mechanical tool with rotating blades and a central blade (no text or symbols)

A: Coins

PRÉCAUTION DE SÉCURITÉ - REBOND

PHÉNOMÈNE DU REBOND:

Illustration of hands operating a chain-linking machine (no text or symbols)

TRACTION REFOULEME

Illustration of hands operating a chain mill with a gear and a circular cutter (no text or symbols)

Illustration showing five different logging methods for workers using a wooden log, with prohibition symbols indicating no protection.

MAINTENANCE DE LA SCIE À CHAÎNE

Technical line drawing of a mechanical assembly with internal components (no text or symbols)

BOUGIE

Intervalle de maintenance