GB-18
BK3420FL-EZ
9. Maintenance
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FLEXIBLE SHAFT
Apply grease to the flexible shaft every 25 hours use.
1. Take out the flexible shaft while raising the stopper
of the clutch housing.
2. Take out the inner shaft, apply grease to the surface
of the inner shaft, and insert the inner shaft into the
liner.
Designated grease
Lithium-based heat-resistant grease (#2)
(1) Stopper
(2) Liner
(3) Inner shaft
(4) Grease
(5) Liner
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MAINTENANCE EVERY 100 HOURS
1. Remove the muffler, insert a screwdriver into the vent,
and wipe off any carbon. Also, wipe off any carbon
at the muffler outlet.
(1) Screwdriver
(2) Muffler
2. Further tighten all screws, bolts and fittings.
3. Make sure that no oil or grease remains between the
clutch lining and the drum. If you see any there, wipe
it off using oil-free, lead-free gasoline.
4. Remove the float chamber of the carburetor, and
clean the inside of the float chamber.
(3) Float chamber
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ADJUSTING THE ENGINE
WARNING
Continued rotation of the blade after the throttle
lever is set to the idling position could be dangerous.
If the blade continues to rotate even after readjust-
ing the idling adjustment screw, the throttle lever,
throttle wire, or clutch might be faulty. Contact the
shop where you bought this product, and ask it to
check and repair the trouble.
IMPORTANT
• 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 of the engine,
air density, etc.). When readjustment is necessary,
try to do so as described below. If this is difficult,
contact the shop where you bought this product, and
ask it to implement the readjustment.
• Make sure the throttle wire is parallel with the flexible
shaft. If the throttle wire is twisted, straighten it.
• If the flexible shaft is bent, the play of the throttle wire
changes. When you adjust the idling, bend the flex-
ible shaft and adjust the idling in a standing position
similar to the position in which you actually use the
machine.
How to adjust the idling revolution speed
Warm up the engine at a medium speed for a few min-
utes after starting it. Turn the idling adjustment screw
on the carburetor body using the screwdriver supplied
as a standard accessory, and adjust the idling revolution
speed to an appropriate value (when the throttle lever
is returned to its original position, the blade does not
rotate, and the engine does not stop).
The engine revolution speed increases when you turn
the idling adjustment screw clockwise, and decreases
when you turn it counterclockwise.
Standard idling revolution speed: 2,300 to 2,700 rpm
(1) Idling adjustment screw
(2) Rotation increases.
(3) Rotation decreases.
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