GB-20
BK3420FL-EZ
9. Maintenance
■
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)
(1) Plug
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BLADE
WARNING
• In order to carry out cutting work safely, be sure
to check the blade before you begin and after you
finish your work. If you continue to use a blade
which has become loosened, chipped, cracked,
broken, or bent, such a blade might disintegrate
and broken pieces might hit you or adjacent work-
ers, causing a serious injury.
• Be sure to stop the engine before checking the
blade. If you check the blade with the engine still
in operation, the blade might begin to rotate be-
cause of overturning of the machine, etc.
WARNING
• When checking the blade, be sure to stop the
engine and wear gloves. Handling the blade with
bare hands might cause an injury.
(1) Blade
(1)
IMPORTANT
Do not use a blade which has worn away and has be-
come round. Such a blade does not cut well, and grass
and twigs easily wind themselves around it, thus increas-
ing the load on your arm during cutting and affecting the
fuel consumption and 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 STOR-
AGE
WARNING
This machine is highly inflammable.
• When you take fuel out, keep the fuel tank well
away from flames.
• Be careful not to spill the fuel, and completely wipe
off all fuel spills.
IMPORTANT
• If you will not use the machine for a long time (two
months or more), take out the fuel from the fuel tank
and carburetor. If you leave the fuel tank and carbu-
retor filled with fuel for a long time, the fuel might
deteriorate and clog the inside of the carburetor, thus
causing engine problems (such as wrong start or
insufficient output).
• When storing the machine for a long time, loosen the
cap of the fuel tank slightly. Excessive tightening of
the cap might deform its packing over time.
1. Brush off dirt from the machine, and check the dam-
age or slack of each part. If you find any abnormal
part, repair it completely ready for the next time the
machine is used.
2. Extract fuel from the fuel tank, switch on the engine,
and leave it running until it stops naturally.
3. Remove the spark plug, and pour 1 to 2 ml of 2-cycle
oil into the engine. Draw the starter rope two to three
times, set the plug back, and stop it at the contrac-
tion position.
4. Supply some grease to the gear case, and apply
anti-rust oil to the metal parts such as the throttle
wire.
5. Apply a little oil to the blade, put the cover on the
blade, and keep the machine in a safe place away
from heat and humidity.
(1) Tank cap
(2) Fuel tank
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