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GB-9

BK3420FL-EZ

G

B

6. Set up

WARNING

•  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

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 
(M5xL10) and the screw (M5xL18) for mounting the 
throttle lever.

2.  Insert  the  main  pipe  into  the  joint  while  turning  it 

clockwise and counterclockwise slightly.

3.  Align the safety-lock hole of the joint with the hole of 

the main pipe, screw the clamping bolt and fasten it 
tightly.

4.  Tighten the fastening bolt of the joint, and fix the main 

pipe firmly.

[Tightening torque] 
4.9 to 7.8 N

m (0.5~0.8 kg

m)

5.  Screw the throttle-lever mounting screw, and fasten 

it tightly.

(1) Screw (M5xL18) 

(5) Throttle lever

(2) Clamping bolt (M5xL10) 

(6) Joint

(3) Safety-lock hole 

(7) Clamping bolt 

(4) Main pipe 

     

(M5xL10)

6.  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.

(1) Inner shaft

7.  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.

(1) Clutch housing
(2) Clutch dram 

square-hole

(3) Hole

IMPORTANT

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.

01-BK3420FL-EZ_GB_207_三.indd   9

12.9.21   1:24:14 PM

Summary of Contents for BK3420FL-EZ

Page 1: ...L BRUSHCUTTER 115 49 27 38 207 Before using our products please read this manual carefully to understand the proper use of your unit Keep this manual handy G B Original Language 01 BK3420FL EZ_GB_207...

Page 2: ...3 Wire clamp 24 Engine stopping switch 25 Flexible shaft SAFETY FIRST Instructions contained in warnings within this manual marked with a symbol concern critical points which must be taken into consid...

Page 3: ...or s view Engine Displacement cc 33 6 Fuel Used Lubricating oil mixed gasoline Lubricating Oil Used 2 stroke engine oil Mixing rate GASOLINE 25 OIL 1 When using market oil JASO FB grade oil or ISO L E...

Page 4: ...oduct to order new labels and affix them in the re quired location s Warning Attention 1 Read owner s manual before operating this machine 2 Wear head eye and ear protection 3 Don t remove the debris...

Page 5: ...hen the ground is slippery or when you can t maintain a steady posture 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 ga...

Page 6: ...rn off the engine and check the whole unit Do not use it until the trouble has been prop erly corrected 5 Keep all parts of your body away NOTE Check and follow the local regula tions as to sound leve...

Page 7: ...tachment other than those bear ing the ZENOAH mark and rec ommended for the unit 6 Under no circumstances should you ever take apart the product or alter it in any way Doing so might result in the pro...

Page 8: ...ss only Do not let the blade contact materials it cannot cut such as hard woody vines and brush or rocks fences metal etc 3 Be extra prepared for blade thrust if you must cut where you cannot see the...

Page 9: ...the joint and fix the main pipe firmly Tightening torque 4 9 to 7 8 N m 0 5 0 8 kg m 5 Screw the throttle lever mounting screw and fasten it tightly 1 Screw M5xL18 5 Throttle lever 2 Clamping bolt M5x...

Page 10: ...G 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 even...

Page 11: ...e outer holder 2 Put the blade on the blade rest plate with the blade surface on which there is writing facing toward the gear case then fit the hole of the blade to the project ing part of the blade...

Page 12: ...t plate and the outer holder on the gear shaft correctly and stop their whirl with the accessory L shaped round rod 2 Screw the mounting bolt M7 left handed attached to the nylon cutter into the gear...

Page 13: ...ay be difficult to agitate depending on oil ingredients sufficient agita tion is necessary for the engine to last long Be care ful that if the agitation is insufficient there is an in creased danger o...

Page 14: ...ORTANT If you repeat the starting operation while leaving the choke closed the electrodes of the spark plug might become wet and prevent starting If this happens try the starting operation again after...

Page 15: ...stones etc might damage the blade and driving unit or bend the main pipe SHOULDERING THE MAIN BODY OF THE UNIT 1 Start the engine and allow it to warm up Then return the throttle lever to the idling p...

Page 16: ...ause grass weeds or twigs to be caught up in the blade It also wears down the clutch more quickly SELECTION OF BLADE WARNING When cutting branches and plants always use a saw blade and never use an ei...

Page 17: ...ipe has been damaged Replace Broken or cracked Repair or replace The connecting part has become loose Repair or replace Cut off cracked discolored or deformed Replace The shaft has become loose Repair...

Page 18: ...ORTANT The idling engine speed is adjusted when this prod uct is shipped from the factory but it might need to be readjusted according to changes in operation conditions e g changes in the stability o...

Page 19: ...r the fuel filter is damaged replace it with a new one Part No Z4551 85100 IMPORTANT If the fuel filter is clogged the engine rotation speed might not increase or rotation fluctuations might occur 1 R...

Page 20: ...life span of the machine Be sure to check the blade before or after using the machine If anything is wrong with the blade replace it with a new one or sharpen it again MAINTENANCE BEFORE LONG TERM STO...

Page 21: ...n the choke open the throttle full open and pull out the rope repeatedly page 14 Clean the muffler page 18 Clean the electrodes or replace the plug page 19 Replace it with normal fuel page 13 Clean th...

Page 22: ...PART 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 OBLIGATION OF THE COMPANY THE COMPANY I...

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