Idle Adjustment; Checking The Idle Speed; Resharpening The Cutter Blade - Makita RBC420E Original Bedienungsanleitung

Idle adjustment

- Never attempt to make engine adjustments while the unit is running and strapped
to the operator. Always make engine adjustments with the unit resting on a flat,
clear surface.
The cutter blade or the nylon cutting head should not run when the throttle lever is
fully released. If necessary, adjust the idle rpm using the idle adjusting screw.

Checking the idle speed

- Idle speed should be set to 2,600 rpm.
If necessary correct it by means of the Idle adjustment screw (the blade or the
nylon cutting head must not turn when the engine is at Idle.)
Turning the screw clockwise will cause an increase in the engine speed, whereas
turning the screw counterclockwise will reduce the engine speed.
Carburetor setting
NOTE: Do not adjust carburetor unless necessary.
If you have trouble with carburetor, see your dealer. Always adjust
carburetor with pipes assembled to the machine.
NOTE: The low speed adjustment and the high speed adjustment screw have
a sharp point. To avoid carburetor damage, do not use excessive force
when seating needle in body.
- The low (L) speed adjustment screw controls the volume of fuel/oil mixture at low
engine speed. It also controls the supplementary fuel required to obtain smooth
progression from idling to high speed.
- The high (H) speed adjustment screw controls the volume of fuel/oil mixture at full
throttle.
- If you use your machine at high altitudes (mountains) or at sea level, it may be
necessary to change the carburetor setting in the range of the adjustment.
Carry out the correction at the two adjusting screws (L and H) as follows: Turn
clockwise (leaner) for high altitude operation or counter-clockwise (richer) for
operation at sea level.
CAUTION: Adjustment of the high speed adjusting screw not only affects the
power output but also the maximum off-load engine speed. If the
setting is too leave (screw turned too for clockwise), the maximum
permissible engine speed will be exceeded. This can cause engine
damage, brought about by lack of lubrication and overheating in
particular.

Resharpening the cutter blade

CAUTION: The cutter blades mentioned below must only be resharpened by
an authorized facility. Manual resharpening will result in
imbalances of the cutting tool causing potentially dangerous
vibrations and damage to the equipment.
- Cutter blade (star blade (4 teeth), eddy blade (8 teeth))
An expert resharpening and balancing service is provided by Authorized Service
Agent.
NOTE: To increase the service life of the cutter blade (star blade, eddy blade) it
may be turned over once, until both cutting edges have become dull.
Never continue to use a dull blade or kickback and serious injury may
result.
18
Increase
Idle adjusting
screw
Reduce