MS051 - Uncategorized Maruyama - Free user manual and instructions

Product Type	Gasoline Chainsaw
Brand	Maruyama
Model	MS051
Engine Displacement	50.6 cc
Engine Power	2.6 kW (3.5 HP)
Fuel Type	Mixed gasoline (50:1 ratio)
Fuel Tank Capacity	0.5 L
Oil Tank Capacity	0.3 L
Guide Bar Length	18 inches (45 cm)
Chain Pitch	3/8 inch
Chain Gauge	0.050 inch (1.3 mm)
Weight (without bar and chain)	5.2 kg
Weight (with bar and chain)	6.1 kg
Chain Brake	Yes, inertia activated
Throttle Lockout	Yes
Anti-Vibration System	Yes
Automatic Oiler	Adjustable flow
Air Filter Type	Nylon mesh with pre-filter
Spark Plug Type	NGK BPMR7A
Exhaust Type	Catalytic converter
Sound Level (LpA)	98 dB(A) (operator ear)
Vibration Level (front handle)	4.5 m/s²
Vibration Level (rear handle)	5.8 m/s²
Recommended Cutting Range	Up to 35 cm diameter

Frequently Asked Questions - MS051 Maruyama

What is the correct fuel mixture for the Maruyama MS051?

Use a 50:1 ratio of unleaded gasoline to high-quality 2-stroke oil (e.g., Maruyama genuine oil). Mix thoroughly before filling.

How do I adjust the chain tension?

Loosen the bar nuts slightly, turn the tensioning screw clockwise to tighten the chain until it touches the bottom of the guide bar rail, then tighten the nuts. The chain should move freely by hand.

What type of chain oil should I use?

Use bar and chain oil with tackifiers for better adhesion. In cold climates, use winter-grade oil. Do not use used motor oil.

How often should I clean or replace the air filter?

Clean the air filter after every 5 hours of operation or daily in dusty conditions. Replace it annually or if damaged.

Why does my chainsaw stall when idling?

Possible causes: clogged air filter, incorrect idle speed adjustment, or carburetor issue. First clean the air filter, then adjust the idle screw (T) to 2800-3200 rpm.

What safety gear is recommended while operating the MS051?

Always wear a safety helmet with face shield, hearing protection, chainsaw chaps, non-slip gloves, and steel-toe boots.

How do I sharpen the chain?

Use a 4.8 mm round file for 3/8 pitch chain. File each cutter at a 30° top plate angle and 10° side plate angle, maintaining equal length across all cutters.

What is the correct spark plug gap for the MS051?

Set the spark plug gap to 0.5 mm (0.020 inch). Use a NGK BPMR7A or equivalent.

How should I store the chainsaw for long periods?

Empty the fuel tank and run the engine dry. Remove the spark plug and add a teaspoon of oil into the cylinder, pull the cord slowly, then replace the plug. Store in a dry place.

What is the recommended chain pitch and gauge for replacement?

The chain pitch is 3/8 inch and gauge is 0.050 inch (1.3 mm). Use a 64-drive link chain for 18 inch bar.

USER MANUAL MS051 Maruyama

OWNER'S/OPERATOR'S MANUAL

Thank you for purchasing this product.

This operation manual explains the correct handling method, simple checks and maintenance of this product.

Please read this operation manual carefully, understand its contents, and use it to maintain the superior performance of this product.

Keep this manual carefully after you read it and use it for extended operation of this product. Note that discrepancies between the actual product and

the content of this manual may be found as we are continually making improvements to provide better quality products to our customers.

• Please keep this operation manual carefully.
• If you lose this operation manual, purchase a replacement at your nearest sales outlet or our sales office.
• Modifying this product prevents safe and comfortable operation, and is very dangerous

Purpose of use

This product can be used for the following agricultural work. Avoid use for purposes other than the following.

1) Spraying chemicals for blight or harmful insects on general farm crops
2) Spraying chemicals for blight or harmful insects on fruit trees
3) Spraying chemicals for blight or harmful insects on crops cultivated in greenhouse
4) Spraying chemicals for blight or harmful insects on flowers
5) Spraying disinfecting liquid or insecticide on

farm house or chicken house

6) Spraying chemicals and water for blight or harmful on garden trees, bonsai, or lawns
7) Spraying disinfecting liquid and insecticide for urban sanitation
8) Spraying chemicals for blight or harmful insects on flower beds and in parks
9) Spraying weed killer to control weeds
10) Cleaning and spraying water for vegetables or root vegetables
When transporting by automobile, take action to prevent the machine from falling.

Warnings

In this manual, important handling cautions are indicated as follows:

DANGER

Death or serious injury may occur when not complying with the warning.

WARNING

Possibly death or serious injury may occur when not complying with the warning.

COUTION

Possibly injury may occur when not complying with the warning

COUTION

Machine will possibly be damaged if not complying with the warning

Contents

1. In order to work safely 2

Cautions prior to work 2

Warning label 2

Cautions when using this product 3

1. Name of each part 4

2. Handling and operating method ____ 5

Assembly of nozzle 5

Oil feeding and mixing 6

How to remove or mount strainer 6

Start 7

Operation and shutting down 9

1. Cleaning, maintenance, and storage ____ 11

Cleaning, maintenance and draining ____ 11

Storage 12

Trouble-shooting and actions 12

1. Specifications 13

1. In order to work safely

Cautions prior to work

The following persons shall not do spraying work.

• Person who cannot do normal spraying work due to fatigue, illness, effects of chemicals.
• Person who is under the influence of liquor
• Person who is pregnant
• Other than spray operator
• Children should be prevented from using this machine.

Appropriate clothes for the work shall be worn

• Check and maintain protective equipment to maintain their normal functions at all times, and use them correctly.
• When lending the machine to another party or having someone else operate it, provide training on the operating method in advance, and explain each at the warning labels with k(Safety caution mark).

Warning label

• Always remove dirt or mud to make the indications legible.
• The following alarm labels are attached.

Read operation manual thoroughly. Make sure you read the operation manual thoroughly prior to use.

Wear personal protective equipment Wear protectors such as hat, safety glasses, ear plugs during work.

Cautions for high temperatures Muffler of engine, fin of cylinder, etc. are at high temperatures. Don't touch them.

Prohibition of fire Don't put a naked flame close to a place where supplying fuel or doing maintenance.

Cautions for exhaust gas Take care not to breathe in exhaust gas from the engine.

Cautions when using this product

Chemicals

• Read labels of chemicals to be used carefully, and understand the method of use and cautions. When spraying quantity per tank (1000m_2) or if the chemical is mistaken, agricultural chemicals can cause damage.
• Store chemicals in a safe place, and be careful not to break open their containers during transportation.
• Treat chemical containers to ensure safety.
• Pay attention to the handling of chemicals. If a chemical enters into eye or mouth, wash it off with water immediately.
• If you feel ill, see a doctor immediately.

- According to wind direction, change the spraying method to protect workers and houses.

When spraying chemicals, work from upwind to downwind. Also give consideration to prevent chemicals from drifting or scattering on crops, enclosures, fish-breeding ponds, and houses nearby.

• When working in and greenhouse, pay attention to ventilation.
• When preparing chemicals, prepare the necessary amount only in accordance with the established spraying plan. If too much chemicals are left over, action is difficult.

CAUTION

• Do not use this machine when there are people, especially children, near the site.
• Because the tank when completely filled with the chemical is very heavy, pay careful attention not to hurt your lower back when carrying it.
• Always adopt a safe working posture when carrying the tank. Do not work at elevated sites using stairs or ladders while carrying the tank.

Fuel

DANGER

• Don't bring a naked flame close to where fuel is supplied or the machine is main-tained.
• When supplying fuel, make sure you stop the engine and wait for the engine to cool down. If fuel is spilled, wipe it off.
• Don't use gasoline alone as fuel.

When using general-purpose two-cycle engine oil

Gasoline : Two-cycle engine oil 50 : 1

Engine

CAUTION

• Temperature of engine is high during operation and immediately after stopping. You will get a burn if you touch the muffler, cylinder fin, etc.
• When starting the engine, confirm that the ball valve is securely closed to prevent explosion caused by a sudden spray.
• Don't touch the spark plug during engine operation. You might get shock.
• Don't operate inside a room. You might suffer by carbon monoxide poisoning.
• Don't breathe in the exhaust gas from the engine.

Recoil Starter

CAUTION

• Potential danger on recoil disassembly.Do not disassemble the recoil.Contact the sales office for repair.
• Do not pull the starting rope thoroughly. Potential failure may be concerned if disregarded.

Pump

- Chemicals are sprayed from the nozzle at a high pressure. Don't spray them toward any body.

Checks prior to work

CAUTION

• Check for loose screws in each portion.
• Loose screws cause accidents.
• Adjust length of carrying strap to fit your physique

2. Name of each part

Confirmation of standard parts

After opening the package, confirm that all accessories are present.

If accessories are missing or damaged, inform the sales outlet where you purchased the product.

Name of each part

3. Handling and operating method

Assembly of nozzle and assembly of belly band Assembly of nozzle

After confirming the existence of packing, securely tighten nozzle pipe to grip, and wide nozzle to nozzle pipe. Tighten the screw securely after confirming the packing to make ensure there is no water leakage. Over-tightening will cause extrusion or break the packing. Correct tightening pressure is important.

Connect opposite side of hose to discharge opening of the spraying machine.

The adjustment of knapsack strap

1. Tighten the strap

2. Loosen the strap

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Pull the strap downward.

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Lift strap buckle upward to loosen.

Oil feeding and mixing

Oil feeding

- Make sure you use blended fuel. Gasoline : exclusive oil 50 : 1

Use exclusive oil for two-cycle engine engines.

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There is a possibility of fuel igniting. Make sure you observe the following items.

DANGER

There is a possibility of fuel igniting. Make sure you observe the following items.

• When feeding fuel, stop the engine and ensure no source of fire such as cigarette is close to the area.
• Don't spill fuel. If fuel is spilled, wipe it all off at once and start the engine after it is dry.
• Don't feed fuel above the standard line. There is the possibility of leakage.
• When a fuel leakage is found, use the engine after repair are done.
  • After feeding fuel, make sure you close the fuel tank cap.
• When starting the engine, be more than three meters from the supply tank.

CAUTION

• If operating the machine with gasoline alone, the engine will seize. Make sure to mix exclusive two-cycle engine oil in the specified quantity.
• The mixing ratio shall be the designated ratio for exclusive two-cycle engine oil.
• Use lead-free gasoline for automobiles for fuel.

6

How to remove or mount strainer

Mixing chemicals

- Read the instructions for the chemical to be used carefully and follow the mixing method and cautions for use.

- After confirming the proper placement of the chemical cover, close the cover securely. Otherwise, chemicals will spill and you might be covered with them when you carry the machine on your back.

Start

Start of engine

• When starting the engine, make sure to put water or chemicals into the chemical tank. Without water or chemicals in the tank, the pump will break down.
• It is confirmed that the ball cock has closed before it starts.

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1 Perform priming.Push priming pump installed in front of the carburetor (rear in the specification with cell starter) several times slowly, and confirm that fuel fills the priming pump and returns to the tank.

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2

Fully close the choke. (In hot weath when engine is hot, the choke should be partly open or fully open.)

7

3

Move throttle lever to medium-and lowspeed position.

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4

Set handle of pressure control valve at "Start" position.

5

Engine will start.

After pulling starting rope gently by two or three times, pull it hard to start the engine.

[Pulling method for starting rope]

1. Grasp starting rope tight with right hand.
2. Hold chemical tank with left hand.
3. Pull starting rope slowly until resistance is felt.
4. Pull starting rope straight from entrance of starter.
5. Do not pull starting rope to the end.
6. Don't release starting rope from pulled state, and let it return to its original state gradually.

CAUTION

If the engine does not start by repeated action, try pulling the rope after fully opening the choke.

※ If the engine still does not start, refer to page 13.

6

Return choke slowly.

8

CAUTION

• Frequent operation of choke when starting the engine causes too much fuel to be sucked in, making the engine difficult to start. In that case, start after making the choke fully open.
• After starting the engine, accelerate bit by bit quickly by opening and closing the throttle lever several times.
• This operation is to bleed air in the carburetor. When there is air present, there is the possibility of poor acceleration and engine stalling.
• Supply fuel prior to use if possible. This will make starting next time easy

Operation and shutting down

Operation

1

Turn the handle of the pressure control valve until there is sufficient pressure for work such as spraying weeds (fixed position).

Weeding When lowpressure spray is required. (Spray of weed killer, etc.)

When engine is started and when pump starts suction.

Spray

Normal spraying work

2

After confirming spraying state and abnormalities in the machine, move throttle lever to high-speed position

CAUTION

• When setting the pressure control valve handle to "spray", "weeding" with throttle fully open at the "high pressure" position of pressure control valve handle, engine revolutions increase as pressure decreases. When using this machine at the "spray", "weeding" position, use at a position little bit back from full open throttle.
• No-load running shall not be carried out except for draining operation. Piston packing might be damaged.

3

When opening ball valve, chemicals will be sprayed from nozzle in a mist.

Stop

Close ball cock

1

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2

Return throttle lever to low speed

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3

Push stop button to stop engine.

Use at fixed position, replacing nozzle and shutting down

Use at fixed position

Connecting method of hose when sucking water from the separate tank in case of operating at fixed position. (Hose, strainer, etc., are optional accessories.)

(1) Remove suction and spillway hose from the tank.
(2) Insert respective hose connection into suction and spillway hose, and fix them using plate

Replacement nozzle

(1) Round nozzle 25 (Optional accessory)
Exclusive nozzle for rounding up weed remover.
(2)Replacement nozzle tip C-35 (Optional accessory)
a. Using replacement nozzle tip, about 1.5 times of spray volume is available compare to standard nozzle.
b. When large volume of spray or large volume of spray at low pressure is necessary, this replacing nozzle can be used.
c. C-35 is indicated on the surface of replacement nozzle tip.(D-6 is standard)
d. Replacement can be done by loosening the screw of the nozzle cap. When replacing, stop the machine. Close ball cock.

4. Cleaning, maintenance, and storage

Cleaning, maintenance and draining

For cleaning, checking and maintenance, be sure to stop the machine.

Check and maintenance items for each season

Cleaning of air cleaner

• When elements become dirty and clog state, reduced output or difficulty starting is observed. Clean the regularly to remove dirt and prevent clogging.
• When cleaning the element, wash it using gasoline, dip it in the blended fuel used and install it after squeezing it hard.

1 Dis

2 Clean

3 Squeeze

Cleaning ignition plug

- Remove carbon, and adjust the clearance to 0.6-0.7mm.

Pump

Check for worn piston packing and seal packing, and replace worn one with new one.

※ For disassembly and maintenance, consult with the sales outlet where you purchased the product or sales office.

Drain

CAUTION

Make sure of drain, otherwise the pump might be damaged by freezing in winter.

①Remove drain cap of chemical tank and hose connecting screw of pump to drain residual liquid.
②Put fresh water into the chemical tank, start the engine, spray from the nozzle to clean the pump and inside of the hose.
③Operate for 15-20 seconds to drain residual liquid at the throttle lever position, which is a little bit back from full open position.
④Set throttle lever at low speed, and stop the engine with the stop button.

Storage

CAUTION

Don't leave chemicals in the chemical tank and pump. This might cause the machine to break down.

1

Remove fuel from fuel tank, and operate the machine in idling state until it stops.

3

Move throttle lever to low-speed position.

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2

Set pressure control valve handle to

"START".

After finishing the above, put the machine in a box and store it at a place free from moisture and which is well ventilated.

CAUTION

• When damage is found, store it after making repairs. In this case, use the genuine parts specified by us for all parts and consumable goods.
• Store at a place that is free from moisture, dust, and contaminants.
• After prolonged storage, when a pump does not absorb water, please push the yellow adherence release cap at
  the cylinder point of a pump one to twice with a finger.

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Trouble-shooting and actions

• When the condition of pump and engine is poor, the following can be expected.
• Where marked with ☆, request adjustment or repair at sales outlet or our sales office.

Pump

Symptom Cause t Treatment
No suction (1) Loose connected of suction hose(2) Suction hose clogged with chemicals(3) Wear to piston packing(4) Foreign matter in valve portion	(1) Tighten sufficiently.(2) Disassemble and clean ☆(3) Replace with new parts ☆(4) Disassemble and clean ☆
Pressure cannot be increased.(poor spraying state)	(1) Wear to piston packing(2) Scratch on the inside surface of cylinder(3) Scratch on delivery valve(4) Wear to pressure control valve seat(5) Foreign material on each valve(6) Wear to cam handle(7) Wear to nozzle hole(8) Too high a nozzle number used

Engine

Symptom Cause	Treatment
Does not start	·No fuel·Fuel filter is clogged·Mis-starting·Bad spark plug·Weak spark·Poor carburetor	·Supply fuel.·Clean·Refer item "Starting engine"·Replace. ☆·Replace or service coil / flywheel.☆·Replace / service ☆
Insufficient output	·Poor adjustment of throttle wire·Clogging of air cleaner element·Carbon building up at exhaust port and muffler	·Adjust. ☆·Clean.·Clean. ☆
Excessive vibration	·Loose part	·Tighten
Excessive noise	·Loose muffler and muffler cover	·Tighten

1. Specification

MS051
L × W × H(mm)	400 × 420 × 630
Dry weight(kg) 7.0
Chemical tank capacity (l) 25
Fuel tank capacity (l)	0.6
Pump
Type	Maruyama Single piston
Maximum pressure(MPa)	362.5
Suction (l/min)	5.1
Rotational frequency(rpm)	2000
Engine
Model	Maruyama EE200P
Type Forced Air Cool, 2-cycle
Displacement(ml)	19.8
Max. Peak Power (HP/rpm)	0.89/7000
Fuel	Mixed gasoline(25:11)
Ignition system	Electronic Ignition
Ignition system	CJ8Y
Stating system	Recoil Starter (Effortless start)

The specification may be changed for product improvement, without prior notice.

Prólogo

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2

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4

5

Arranque el motor.

Normal spraying work

2

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2

Technical line drawing of a mechanical clamp or bracket assembly with a directional arrow indicating motion (no text or symbols present)

3

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4