Zenoah BK3420FL-EZ User Manual

BK3420FL

848G5C93A0 (704)

BRUSHCUTTER

OWNER’S MANUAL

• Before using our products, please read

this manual carefully to understand the

proper use of your unit.

• Keep this manual handy.

Caution

SAFETY FIRST

Instructions contained in warnings within this manual marked with a symbol concern critical points which must be taken into consideration to prevent possible serious bodily injury, and for this reason you are requested to read all such instructions carefully and follow them without fail.

■ NOTES ON TYPES OF WARNINGS IN THE MANUAL

This mark indicates instructions which must be followed in order to prevent accidents which could lead to serious bodily injury or death.

This mark indicates instructions which must be followed, or it leads to mechanical failure, breakdown, or damage.

This mark indicates hints or directions useful in the use of the product.

NOTE

IMPORTANT

WARNING

Contents

1. Parts Location …………………………………3

2. Symbols On The Machine ……………………3

3. Safety Precautions ……………………………4

4. Set Up …………………………………………7

5. Fuel ……………………………………………12

6. Operation ……………………………………13

7. Maintenance …………………………………19

8. Troubleshooting ……………………………26

9. Specifications ………………………………28

1. Muffler

2. Fuel tank

3. Fuel tank cap

4. Shoulder frame

5. Shoulder belt

6. Hanging belt

7. Air cleaner

8. Spark plug

9. Fuel cock

10. Carburetor

11. Recoil starter

12. Choke lever

13. Gear case

14. Tangle-prevention cover

15. Blade (Blade is not included)

16. Blade cover

17. Debris guard

18. Main pipe

19. Loop handle

20. Throttle lever

21. Right-hand grip

22. Throttle wire

23. Wire clamp

24. Engine stopping switch

25. Flexible shaft

2. Symbols on the machine

For safe operation and maintenance, symbols are carved in relief on the machine. According to these indications, please be careful not to take a mistake.

(a) The port to refuel the "MIX GASOLINE" POSITION: FUEL TANK CAP

(b) The direction to close the choke POSITION: AIR CLEANER COVER

1. Parts Location

■ BEFORE USING THE MACHINE

a. Read this owner's manual carefully to

understand how to operate this unit properly.

b. This product has been designed for use in

trimming grass, and it should never be used for any other purpose since doing so could result in unforeseen accidents and injuries occurring.

c. You should never use this product when under

the influence of alcohol, when suffering from exhaustion or lack of sleep, when suffering from drowsiness as a result of having taken cold medicine, or at any other time when a possibility exists that your judgment might be impaired or that you might not be able to operate the product properly and in a safe manner.

d. Avoid running the engine indoors. The exhaust

gases contain harmful carbon monoxide.

e. Never use your product under circumstances

like those described below:

1. When the ground is slippery or when other conditions exist which might make it not possible to maintain a steady posture while using the product.

2. At night, at times of heavy fog, or at any other times when your field of vision might be limited and it would be difficult to gain a clear view of the area.

3. During rain storms, during lightning storms, at times of strong or gale-force winds, or at any other times when weather conditions might make it unsafe to use this product.

f. When using this product for the first time,

before beginning actual work, learn to handling the product from skilled worker.

g. Lack of sleep, tiredness, or physical exhaustion

results in lower attention spans, and this in turn leads to accidents and injury. Limit the amount of time over which the product is to be used continuously to somewhere around 30~40 minutes per session, and take 10~20 minutes of rest between work sessions. Also try to keep the total amount of work performed in a single day under 2 hours or less.

h. Be sure to keep this manual handy so that you

may refer to it later whenever any questions arise.

i. Always be sure to include this manual when

selling, lending, or otherwise transferring the ownership of this product.

j. Never allow children or anyone unable to fully

understand the directions given in this manual to use this product.

■

WORKING GEAR AND CLOTHING

a. When using your product, you should wear

proper clothing and protective equipment as follows.

(1) Helmet (2) Protection goggles or face protector (3) Thick work gloves (4) Non-slip-sole work boots (5) Ear protectors

b. And you should carry with you things as

follows.

1. Attached tools and files

2. Properly reserved fuel

3. Spare blade

4. Things to notify your working area (Rope, warning signs)

3. Safety Precautions

person using the product should be considered a hazardous area into which no one should enter while the product is in use, and when necessary yellow warning rope, warning signs should be placed around the work area. When work is to be performed simultaneously by two or more persons, always check the presence and locations of others so as to maintain a distance each person sufficient to ensure safety.

c. Make sure that there are no loose screws or

bolts, fuel leaks, ruptures, dents, or any other problems which might interfere with safe operation. Be especially careful to check that there is nothing wrong with the blades or with the joints by which the blades are attached to the product.

d. Never use blades that are bent, warped,

cracked, broken or damaged in any way. e. Keep the blade always sharp. f. Filing the cutting edges, keep the end corner

sharp and round the root of the edge. g. Check the bolt to fasten the blade and be sure

the blade turns smoothly without abnormal

noise.

■ NOTES ON STARTING THE ENGINE

1. Take a careful look around to make sure that

no obstacles exist within a perimeter of 15m or

less around the product.

2. Place the body of the product onto the ground

in a flat clear area and hold it firmly in place so

as to ensure that neither the blades nor the

throttle come into contact with any obstacles

when the engine starts up.

3. Place the throttle into the idling position when

starting the engine.

4. After starting up the engine, if the blades

continue to rotate even after the throttle has

been moved fully back, turn off the engine and

check the throttle wire and other parts.

■

KICKBACK SAFETY PRECAUTIONS

•A dangerous reaction may occur when the

spinning blade contacts a solid object in the

critical area. It is called Kick back. As a result,

5. Whistle (for collaboration or emergency)

6. Hatchet or saw (for removal of obstacles)

c. Never use your product when wearing pants

with loose cuffs, when wearing sandals, or when barefoot.

■ WARNING CONSIDERING HANDLING OF FUEL

a. The engine of this product is designed to run

on a mixed fuel which contains highly flammable gasoline. You should never store cans of fuel or refill the fuel tank in any place where there is a boiler, stove, wood fire, electrical sparks, welding sparks, or any other source of heat or fire which might ignite the fuel.

b. Smoking while operating the product or refilling

its fuel tank is extremely dangerous. Always be sure to keep lit cigarettes away from the product at all times.

c. When refilling the tank always turn off the

engine first and take a careful look around to make sure that there are no sparks or open flames anywhere nearby before refueling.

d. If any fuel spillage occurs during refueling, use

a dry rag to wipe up spills before turning the engine back on again.

e. After refueling, screw the fuel cap back tightly

onto the fuel tank and then carry the product to a spot 3m or more away from where it was refueled before turning on the engine.

■ THINGS TO CHECK BEFORE USING THE PRODUCT

a. Before beginning work, look around carefully to

get a feel for the shape of the land, or grass to be trimmed, and whether or not there are any obstacles which might get in the way while working, and remove any obstacles which can be cleared away.

b. The area within a perimeter of 15m of the

3. Safety Precautions

h. Never touch the muffler, spark plug, or other

metallic parts of the engine while the engine is in operation or immediately after shutting down the engine. Doing so may result in serious burns.

i. When you finish cutting in one location and

wish to continue work in another spot, turn off the engine and turn the unit as the blade faces away from your body.

■ MAINTENANCE SAFETY PRECAUTION

a. Perform the maintenance and checking

operations described in this manual at regular intervals. If any parts must be replaced or any maintenance or repair work not described in this manual must be performed, please contact a representative from the store nearest KOMATSU ZENOAH authorized servicing dealer for assistance.

b. Under no circumstances should you ever take

apart the product or alter it in any way. Doing so might result in the product becoming damaged during operation or the product becoming unable to operate properly.

c. Always be sure to turn off the engine before

performing any maintenance or checking procedures.

d. When sharpening, removing, or reattaching the

blade, be sure to wear thick, sturdy gloves and use only proper tools and equipment to prevent injury.

e. When replacing blade or any other parts or

when replacing the oil or any lubricants, always be sure to use only KOMATSU ZENOAH products or products which have been certified by KOMATSU ZENOAH for use with the product.

the operator can lose control of the unit which can cause serious or fatal injury. Avoid kickback, observe the safety precautions below strictly.

1. Keep the cutting blades clear of fances, posts, wires, and rocks to prevent kickback and damage to the blades.

2. When using your product, do not grip other parts except the handles.

3. When using your product, never take your eyes off. If you need to, place the throttle into the idling position.

4. When using your product, do not let the unit get closer to your feet nor raise the unit above your waist.

■ NOTES ON TRANSPORTATION

a. Make sure the appropriate blade cover is in

place.

b. When transporting by car, fix the unit firmly

using a rope. Do not transport by bicycle or motorbike because it is dangerous.

c. Never transport the product over rough roads

over long distances without first removing all fuel from the fuel tank, as doing so might cause fuel to leak from the tank.

■

OPERATION SAFETY PRECAUTIONS

a. Grip the handles of the product firmly with both

hands. If you suspend the work, place the throttle into the idling position.

b. Always be sure to maintain a steady, even

posture while working.

c. Maintain the speed of the engine at the level

required to perform cutting work, and never raise the speed of the engine above the level necessary.

d. If the grass gets caught in the blade during

operation, or if you need to check the unit or refuel the tank, always be sure to turn off the engine.

e. If the blade touches a hard object like a stone,

immediately stop the engine and check if something is wrong with the blade. If so, replace the blade by new one.

f. If someone calls out while working ,always be

sure to turn off the engine before turning around.

g. Never touch the spark plug or plug cord while

the engine is in operation. Doing so may result in being subjected to an electrical shock.

4. Set Up

• Assemble each part correctly. Wrong assembly might cause an accident.

• If you cannot do the assembling yourself, consult the shop where you bought this product.

■ ATTACHING THE SHOULDER STRAP (SE1)

1. Pass the ring of the shoulder strap through the hook(A) and fix it by the bolt securely.

2. Set the hook(B) of each shoulder strap to the D-rings on the frame.

(A) UPPER SIDE (B) LOWER SIDE (1) Hook (A) (2) Bolt (3) D-ring (4) Hook (B)

■ CONNECTING THE FLEXIBLE SHAFT

1. Remove the clamping bolt (M5xL10) in the center of the end of the joint, and loosen the fastening bolt (M5xL20). (SE2)

2. Insert the main pipe into the joint while turning it clockwise and counterclockwise slightly. (SE2)

3. Align the safety-lock hole of the joint with the hole of the main pipe, screw the clamping bolt and fasten it tightly. (SE2)

4. Tighten the fastening bolt of the joint, and fix the main pipe firmly. (SE2)

[Tightening torque]

4.9 to 7.8 N-m (0.5~0.8 kg-m)

(1) Clamping bolt (M5xL10) (2) Safety-lock hole (3) Main pipe (4) Joint (5) Fastening bolt (M5xL20)

5. Hook the cable end into the hole of the throttle lever. And set the cable in the lever as shown in the picture. (SE3)

6. Attach the lever as shown in the picture and screw it securely. (SE3)

(1) Throttle lever (2) Hole (3) Throttle cable (4) Screw (5) Nut

After fitting the wire, check if the wire sleeve is correctly fitted to the wire stopper. It is dangerous if the wire sleeve is out of the wire stopper because the engine speed will not decrease even if the throttle lever is released.

WARNING

SE1

SE2

SE3

WARNING

4. Set Up

7. Align the throttle cable along with the liner and tie it with band. (SE4)

(1) Band (2) Throttle cable (3) Tie loosely

8. Stretch the main pipe and the flexible shaft straight, thrust the inner shaft into the main pipe while turning it by hand, and connect the inner shaft to the shaft of the main pipe. Unless the end of the inner shaft appears from the flexible shaft, the inner shaft has been correctly connected to the shaft of the main pipe. (SE5)

(1) Inner shaft

9. Turn the hole at the end of the flexible shaft upward, align the square hole of the clutch dram with the direction of the inner shaft, and thrust the flexible shaft into the clutch housing until you hear a click. (SE6)

(1) Clutch housing (2) Clutch dram square-hole (3) Hole

After connecting the inner shaft to the shaft of the main pipe, try to pull out the flexible shaft by hand to make sure the flexible shaft does not come off.

■ ADJUSTING THE PLAY OF THE THROTTLE WIRE

If you bend the flexible shaft, the amount of play of the throttle wire changes. Adjust the play while keeping the flexible shaft almost in the actual working condition. (SE7)

(1) Flexible shaft

The play of the throttle wire that extends out of the carburetor with the throttle lever in its original place should be 1 to 2 mm when lightly pulled by finger. If the play is too large or small, readjust it as follows. (SE8)

1. Loosen the lock nut and adjust the throttle wire with the wire brace so that the amount of play is appropriate. The play becomes larger when the wire brace is turned clockwise, and becomes smaller when the wire brace is turned counterclockwise.

2. Tighten the lock nut after adjusting the play, and fix the wire brace.

(1) Lock nut (2) Throttle wire (3) Wire brace

IMPORTANT

SE6

SE7

SE8

SE5

SE4

4. Set Up

■ INSTALLING DEBRIS GUARD

Do not use this machine without the debris guard.

Fit the top of the debris guard to the gear case, install the debris guard on the main pipe with the accessory clamp, and tighten the debris guard evenly with two Phillips screws (M5xL25). (SE9)

[Tightening torque]

2.6 to 4.9 N-m (27 to 50 kgf-cm)

(1) Gear case (2) Clamp (3) Phillips screw (M5xL25) (4) Main pipe (5) Safety-guard cover (6) Fit this part to the gear case.

■ MOUNTING THE HANDLE

1. Mount the loop handle on the main pipe in accordance with the serial-number label. Turn the grip and tighten it slightly, then fasten the hanger plate together in the position shown in (SE10).

2. Adjust the position of the loop handle to the position where you can work easily, and tighten the loop handle firmly.

•Tighten the grip firmly. If the grip becomes loose, it might move while you are working, causing danger.

• Do not loosen or twist the grip while you are working.

•Always stop the engine and make sure the blade has stopped before adjusting the position of the loop handle.

(1) Grip (2) Hanger plate

WARNING

SE9

SE10

WARNING

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