BC4231H - Brush cutter Maruyama - Free user manual and instructions

USER MANUAL BC4231H Maruyama

Illustration of a robotic arm with articulated joints and a tool, set against a stylized abstract background (no text or symbols)

Maruyama.

SAFETY INSTRUCTIONS

1. Read and understand this Instruction Manual before using the brushcutter. Be thoroughly familiar with the proper use of the brushcutter.
2. Never allow children to operate the brushcutter. it is not a toy. Never allow adults to operate the unit without first reading the Instruction Manual.
3. Become familiar with the controls and know how to stop the engine quickly.
4. ALWAYS WEAR SAFETY GLASSES or other suitable eye protection, and hearing protection.
5. Keep the area of operation clear of all persons, particularly small children and pets.
6. Never operate a brushcutter when you are fatigued.
7. Never operate without proper guards or other protective safety devices in place.
8. Dress properly; do not wear loose clothing or jewelry. They can be caught in moving parts. Always wear substantial footwear, long pants and long sleeved shirt.
9. Gasoline is highly flammable; handle it carefully. Fill the fuel tank with the correct mixture of gasoline and oil before trying to start the engine.
10. Use an approved fuel container to store the gasoline/oil mixture.
11. Do not fill the tank when the engine is hot or running.
12. Do not smoke while handling gasoline.
13. Fill the fuel tank outdoors and up to about 10mm from the top of the tank, not the top of the filler neck.
14. Wipe any spilled gasoline before starting the engine.
15. Always be sure of your footing; keep a firm hold of the handles with both hands, and walk, never run.
16. Use the right tool for the job. Do not use the brushcutter for any job that is not recommended by the manufacturer.
17. Keep all fasteners tight to be sure the brushcutter is in safe working condition. Follow the maintenance instructions provided on page 6 of this manual.
18. Do not put hands or feet near or under the rotating parts.
19. Keep clear at all times.
20. If the brushcutter should start to vibrate abnormally, stop the engine and check immediately for the cause. Vibration is generally a warning of trouble.
21. Do not trim too close to the ground in order to avoid hitting small stones or other debris. Avoid using the brush-cutter near rocks, gravel, stones and similar matter.
22. Use the brushcutter only in daylight or good artificial light.
23. Shut off the engine and be certain the cutting blade has completely stopped rotating before inverting the machine.

SPECIFICATIONS

MODEL	BC3021H	BC4321H	BC4321H-RS	BC5021H	BC5021H-RS	BCF4321H	BCF4321H-RS	BCF5021H	BCF5021H-RS
Dry Weight (kg) 5.6 8.1 8.2	8.1 8.2 8	4 8.5 8.4	8.5
Handle Configuration Horn Handle
Engine Displacement (cc) 30	0.1 41.5	41.5 49.9	49.9 41.5	41.5 49.9	49.9
Fuel Tank Capacityr ( ) 0.6	1.0
Carburetor Diaphragm Type
Ignition Solid State System
Spark Plug NGK BPM6Y Set Gap 0,6 - 0,7 mm
Fuel Mixture	Use Only Non - Leaded Regular Gasoline.2 - Cycle Oil Mix 25:1 Ratio Must Be Approved For Air - Cooled Engines.

Product Description

BC3021H

Technical diagram of a mechanical device with numbered components for identification

1. Gearcase
2. Drive Shaft Assembly
3. Model Name
4. Horn Handle
5. Attachment Ring for Shoulder Hanging Strap
6. Throttle Trigger and Stop Switch
7. Shaft Grip
8. Clutch Drum Housing
9. Engine
10. Air Filter
11. Fuel Tank
12. Throttle Cable and Stop Switch Wires
13. Blade Guard
14. Cutting Blade
15. Shoulder handging strap
16. Shoulder Harness

BC4321H, BC4321H-RS, BC5021H, BC5021H-RS BCF4321H, BCF4321H-RS, BCF5021H, BCF5021H-RS

Technical diagram of a mechanical linkage system with numbered components for identification

ASSEMBLY INSTRUCTIONS

ENGINE AND DRIVESHAFT ASSEMBLY

Attach the clutch drum housing to the engine using the four screws.

HORN HANDLES

1. Loosen the four screws on the top of the clamp bracket.
2. Insert the left and right horn handles into the clamp bracket.

CONNECTING THROTTLE CABLE AND STOP SWITCH WIRES

1. Insert the throttle cable through the carburetor bracket, then screw a cable adjuster sleeve into the carburetor bracket fully.
2. Position the slotted fitting on the carburetor so the recessed hole for the lug is away from the cable adjuster sleeve.
3. Rotate teh carburetor throttle cam and slip the throttle cable through the slot in the slotted fitting, making sure the cable lug drops into the recessed hole.
4. Operate the throttle trigger a few times to make sure that it works correctly.
5. Adjust the cable adjuster sleeve so the stop on the carburetor throttle cam just contacts the throttle stop and the cable position keep 1-2mm play between cable lug and slotted fittings when the throttle trigger is fully depressed.
6. When the throttle cable is adjusted correctly, tighten the lock-nut.
7. Plug the stop switch wires into the matching connectors from the engine. Note that wire polarity is not important.

[Except a BC3021H]

1. Lap and fix the stop switch wires and connectors with clamp.

[BCF4321H, BCF4321H-RS, BCF5021H, BCF5021H-RS]

Clamp the throttle cable assembly with two bands as shown.

[BC4321H, BC4321H-RS, BC5021H, BC5021H-RS]

Clamp the throttle cable assembly as shown.

Engine Screw (4) Clutch Drum Housing Screws (4) Horn Handle Clamp Bracket Cable Adjuster Sleeve Throttle Cable Carburetor Bracket Slotted fitting Cable Lug Lock nut Recessed Hole 1-2mm Play Stop Switch Wires Clamp Throttle Cable Assembly Band (2) [BC4321H, BC4321H-RS, BC5021H, BC5021H-RS] [BC4321H, BC4321H-RS, BC5021H, BC5021H-RS]

[BCF4321H, BCF4321H-RS, BCF5021H, BCF5021H-RS]

Caution! : This swivel stopper is exclusively for fixing the handle in transport. Do not engage the swivel stopper while operating the brush-cutter.

In transport:

Loosen the wing nut, place the stopper on A position of the bracket. Tighten the wing nut, confirm the handle is fixed by the swivel stopper. In operation: Before start operation of the brushcutter, disengage the swivel stopper. Loosen the wing nut, place the stopper at B position. Tighten the wing nut to fix there, confirm the handle becomes free to turn around.

Bracket "A" Position Swivel Stopper "B" Position Wing Nut [BCF4321H, BCF4321H-RS, BCF5021H, BCF5021H-RS]

BLADE GUARD

Attach the blade guard to the gearcase with the two M6× 30 screws.

Gearcase Screws (2) Shaft Clamp Blade Guard Clamp (Threaded)

CUTTING BLADE

A variety of metal cutting blades are available to satisfy different cutting conditions. It is especially important to use only the correct blade(s) approved for each model brushcutter. Also, it is especially important to install the blade for LEFT- HAND rotation (as viewed from the operator's position), and to correctly position all blade holding parts (see sketch).

Left hand thread Blade bolt Stabilizer Washer Cutting Blade Holding Tool (3.5mm Pin) Boss Adapter Gear case

[BC3021H]

Left hand thread Blade nut Stabilizer Washer Cutting Blade Holding Tool (3.5mm Pin) Boss Adapter Gear case

[Except a BC3021H]

BEFORE OPERATION

FUEL : MIXING GASOLINE AND OIL

The two cycle engines used in the brushcutter requires a mixture of GASOLINE and OIL for lubrication of bearings and other moving parts. The proper fuel mixture ratio is 25:1, which is 40cc of oil mixed with one liter of gasoline.

NOTE : Gasoline and oil must be premixed in a clean gasoline container. Never mix gasoline and oil indoors or in the burushcutter fuel tank. Always use fresh gasoline.

WARNING !! - NEVER USE GASOHOL OR ALCOHOL BLENDED FUELS IN MARUYAMA ENGINES.

Before filling the brushcutter fuel tank, clean around the fuel tank cap so dirt and debris does not enter the fuel tank. Always shake the fuel container before filling the fuel tank. Remove the fuel cap, then fill the fuel tank to within about 10mm from the top of the tank. Avoid filling the fuel tank filler neck. Install the cap securely onto the fuel tank.

OPERATING INSTRUCTIONS Starting and Stopping

COLD STARTING PROCEDURE

The carburetor on this engine is equipped with a fuel primer and a choke system. To start a "cold" engine properly, perform the following procedure:

1. Pump the primer bulb until fuel can be seen flowing through the fuel return line to the fuel tank. (Flowing fuel should be almost clear, not foamy or full of bubbles.)

2. Turn the choke lever to the Close position.

3. With the stop switch "ON", and the throttle trigger positioned at Fastidle position, pull the starter grip.

After the engine is started, turn the choke lever to the Open position. Then squeeze and release the throttle trigger to allow it to return to the idle position.

If the engine stops running before you turn the choke lever to the open position:

Go ahead and open the choke, pull the starter grip with the throttle trigger positioned at Fast-idle position.

HOT RESTART

To start the engine that is already warmed up (hot restart), or if the ambient temperature exceeds 68^(20^) :

1. Pump the primer bulb until fuel can be seen flowing through the fuel return line to the fuel tank. (Flowing fuel should be almost clear, not foamy or full of bubbles.)

2. Turn the choke lever to the open position, and set the stop switch to the "ON" position.

3. Leave the throttle trigger in the idle position and pull the starter grip.

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

TO STOP THE ENGINE:

1. Release the throttle trigger.
2. Slide the stop switch to "STOP" position.

CARBURETOR ADJUSTMENT

The carburetor has been carefully adjusted at the factory and should not require any further adjustment. Only the idling speed can be adjusted by turning the idle speed adjustment screw (see sketch). The correct speed for model BC3021H is 2700 - 3300 RPM, and for others are 2400 - 2800 RPM (or just below the clutch engagement speed). Turning the adjustment screw clockwise will increase the idle speed.

If further adjustment is necessary, please contact a local authorized MARUYAMA dealer.

Choke Lever Fuel Return Line [BC3021H] Starter GripPrimer Bulb

Primer Bulb Fuel Return Line Starter Grip Choke Lever [Except a BC3021H]

Fast-idle Start Lock START(ON) STOP(OFF) Stop Switch Fast-idle Position Idle Position

Idle Speed Adjustment Screw

[BC3021H] [Except a BC3021H]

MARUYAMA brushcutters are designed and tested to cut nearly all grasses, thick weeds and brush. As you continue to use the equipment, many tasks will become easier.

CAUTION-Adjust the blade guard to a position that does not make contact with the blade or trimming line, and shields the operator from thrown debris.

CAUTION-Read the SAFETY INSTRUCTIONS concerning the proper use of the brushcutter on page(1).

CAUTION-Observe all warnings that appear on the brushcutter.

CAUTION-Use only the correct blade approved for the task and the machine.

CAUTION-Always use the Shoulder Hanging Strap when operating a brushcutter with a metal blade. The brushcutter must be positioned to the right side of the operator when used with a metal blade.

CAUTION-Always make certain the blade is installed to rotate in the proper direction and that all holding and fastening parts are correctly secured.

CAUTION-Remove the holding tool (É"3.5mm pin) before operating the equipment!

CAUTION-Do not continue to use a blade that is dull, damaged, or that vibrates during use. Whenever a cutting blade becomes clogged with debris, immediately stop the machine and clean the blade.

CAUTION-When cutting heavy blush or small trees, use the proper method to avoid dangerous "KICKBACK" (see sketch).

No Kick-back Zone Direction of Motion CORRECT

Direction of Motion DANGER Kick-back Zone INCORRECT

REGULAR MAINTENANCE

AIR FILTER

The air filter should be cleaned each time the brushcutter is used. (Or more often with extreme conditions.) Remove the filter cover and take out the element. Wash the element in kerosene or warm detergent, then squeeze it dry. Apply oil (#30 wt.) to foam, removing all excess oil. Assemble and reinstall the element and filter cover.

Filter Cover Filter Screen Knob Foam Element

Filter Cover Knob Foam Element

[Except a BC3021H][BC3021H]

SPARK PLUG

The spark plug should be removed from the engine and checked after each 25 hours of operation. The tips can be cleaned with a stiff brush. Adjust the gap to 0,6-0,7mm (see sketch). Replace the spark plug if it is oil_fouled or damaged, the average spark plug life is approximately 100 hours.

CAUTION-Do not over_tighten the spark plug. The correct torque is 10.7-16.6N·m(100 -160 kgf ·cm)

COOLING FINS CLEANING

1. Loosen the knob (and screw: BC3021H) and lift off the cylinder cover.
2. Clean all dirt and debris from the cooling fins and from around the cylinder base.
3. Reinstall the cylinder cover.

FUEL FILTER

The fuel filter is attached to the end of the fuel pick_up hose inside the fuel tank. After each 25 hours of use, it should be checked for dirt or damage, and replaced if necessary. Using a wire hook, gently pull the fuel filter out through the fuel filler opening. Grasp the fuel hose next to the fuel filter fitting and remove the filter, but do not release the hose. While still holding on to fuel hose, attach the new fuel filter. Drop the new fuel filter back into the fuel tank. 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.

LUBRICATION : GEARCASE

The gearcase should be checked for lubrication after each 30 hours of use. Remove the cutting attachment and the boss adapter. Clean any dirt and debris from the area between the boss adapter and the gearcase. Remove the grease plug from the side of the gearcase. While rotating the attaching shaft, Inject lithium base bearing lube (P/N 211337) through the plug hole until the gearcase is full. Reinstall the boss adapter and grease plug.

Tips 0.6-0.7mm Filter Cover Cylinder Cover Screw Knob Cooling Fins [CBC3021H] Cylinder Cover Knob Cooling Fins [Except a BC3021H]

Wire Fuel Filter Fuel Pick-up Hose

Bearing Lube (P/N.211337) Gearcase Grease Plug Plug Hole Boss Adapter Attaching Shaft

GENERAL CLEANING AND TIGHTENING

The MARUYAMA brushcutter 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.

STORAGE

For long term storage of the Brushcutter, perform all regular maintenance procedures and needed repairs. Empty the fuel tank. Start the engine and allow it to run until it stops. Pull the starter cord a few times to remove any excess fuel from the engine. Remove the spark plug and insert a small amount of oil. Pull the starter cord once and bring the piston to a position closest to the spark plug hole. Reinstall the spark plug. Store the brushcutter in a dry place away from excessive heat, sparks or open flame.

Maruyama.

Technical diagram of a mechanical device with numbered components for identification

Technical diagram of a mechanical linkage system with numbered components for identification

Abstract black-and-white logo design featuring a stylized 'M' within an oval frame (no text or symbols)

Maruyama U.S., Inc.

3570 Shelby Lane

Denton, TX 76207 U.S.A

P.O. Box 2107

Denton, TX 76202 U.S.A

Phone [phone]

Fax [phone]

www.maruyama-us.com

P/N 230756-02 09.10 TAP/M