GB-20
BKZ315L
9. Maintenance
WARNING
• Make sure that the engine has stopped and is cool
before performing any service to the machine.
Contact with moving cutting head or hot muffler
may result in a personal injury.
AIR FILTER
• The air filter, if clogged, will reduce the engine perfor-
mance. Check and clean the filter element in warm,
soapy water as required. Dry completely before in-
stalling. If the element is broken or shrunk, replace
with a new one.
(1) Air filter
FUEL FILTER
• When the engine runs short of fuel supply, check the
fuel cap and the fuel filter for blockage.
(1) Fuel filter
SPARK PLUG
• Starting failure and misfiring are often caused by a
fouled spark plug. Clean the spark plug and check
that the plug gap is in the correct range. For a re-
placement plug, use the correct type specified by
ZENOAH.
0.9
〜
1.0 mm
• REPLACEMENT PLUG IS A NGK CMR7H-10
IMPORTANT
• Note that using any spark plug other than those des-
ignated may result in the engine failing to operate prop-
erly or in the engine becoming overheated and dam-
aged.
• To install the spark plug, first turn the plug until it is
finger tight, then tighten it a quarter turn more with a
socket wrench.
[Tightening torque]
9.8 to 13.7 N•m (100 to 140 kgf•cm)
MUFFLER
WARNING
• Inspect periodically, the muffler for loose fasten-
ers, any damage or corrosion. If any sign of ex-
haust leakage is found, stop using the machine
and have it repaired immediately.
• Note that failing to do so may result in the engine
catching on fire.
■
GEAR CASE
Supply lubricating grease to the gear case every 25
hours of use.
Designated grease
Lithium-based heat-resistant grease (#2)
[How to supply grease]
1. Remove plugs both sides of gear case, and pour
grease from the one side plug hole.
2. Stop supplying the grease when all the old grease
has been pushed out from the opposite plug hole,
and mount the plug in its original position.
3. Wipe off the pushed-out grease, and mount the blade
and the blade rest plate in their original positions.
(1) Plug
(1)
(1)
FLEXIBLE SHAFT
1. Pull out the flexible liner while pulling the stopper up-
ward.
2. Pull out the inner shaft from the clutch housing side
hole, apply Zenoah Genuine Power Grease (3180-
96251) or lithium-based heat-resistant grease (#2)
to the shaft, and insert the shaft back into the liner.
(1)
(3)
(2)
(4)
(2)
(1) Stopper
(2) Flexible liner
(3) Gear case
(4) Inner shaft
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