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GB-12

BK3420FL-EZ

6. Set up

Installing the nylon cutter (available as an option)

IMPORTANT

Since the resistance of the nylon cutter is larger than 
that of the metal cutter, wrong operation of the nylon 
cutter will cause the clutch to overheat, deform and be 
damaged. When using the nylon cutter, carefully note 
the following.

•  Use ZENOAH’s genuine nylon cutter. When using a 

commercially-available nylon cutter, make sure that 
it is no longer than 10 cm in external shape.

•  Make sure that the length of the nylon cord is 17 cm 

or shorter.

•  Keep the engine rotating at high speed while work-

ing.

1.  Install the blade rest 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 shaft, and tighten it 
firmly with a wrench.

[Tightening torque] 
14.7 to 19.6 N

m (150 to 200 kgf

cm)

3.  Screw  the  main  body  of  the  nylon  cutter  into  the 

mounting bolt while fixing the blade rest plate with 
the L-shaped round rod, and tighten the main body 
of the nylon cutter firmly by hand.

(1) Main body of the nylon cutter
(2) L-shaped round rod
(3) Gear case
(4) Blade rest plate
(5) Outer holder
(6) Mounting bolt
(7) Nylon cord

NOTE

The bolt, washer, and other parts for mounting the blade 
are required when using the metal blade. Keep them 
carefully so as not to lose them.

01-BK3420FL-EZ_GB_207_三.indd   12

12.9.21   1:24:15 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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