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WARNING
POTENTIAL HAZARD
• Engine must be running to make car-
buretor adjustments.
• When engine is running, attached tool
and other parts is rotating/moving and
other parts are moving.
WHAT CAN HAPPEN
• Contact with rotating/moving tool or
other moving parts could cause seri-
ous personal injury or death.
HOW TO AVOID THE HAZARD
• Keep hands, feet and clothing away from
attached tool and other moving parts.
• Keep all bystanders and pets away from unit
while making carburetor adjustments.
When the throttle trigger is released, the engine should
return to an idle speed. The correct speed for models
M270QC, M300QC are 2700-3300 RPM, and for
M420BK-QC is 2400-2800 RPM, or just below the
clutch engagement speed. The Attached Tool must not
rotate/move and the engine should not stall (stop run-
ning) at engine idle speed.
To adjust the engine idle speed, rotate the idle speed
adjustment screw on the carburetor.
Idle Speed Adjustment Screw
● T urn the idle speed screw in (clockwise) to increase
the engine idle speed.
● T urn the screw out (counter-clockwise) to decrease
the engine idle speed.
If idle speed adjustment is necessary, and after adjust-
ment the Attached Tool rotates/moves or the engine
stalls, stop using the Multi-Cutter immediately!
Contact your local authorized MARUYAMA Dealer for
assistance and servicing.
All manuals and user guides at all-guides.com
— US-12 —
Adjusting Cutting Blades
Maintenance Interval
CAUTION
• DO NOT TOUCH THE SHARPENED
EDGES OF THE CUTTING BLADES.
T H E C U T T I N G B L A D E S A R E
E X T R E M E L Y
DANGEROUS AT ALL TIMES.
Before operating the power Hedge Trimmer it is neces-
sary to check the adjustment of the cutting blades.
Blades that are too loose may vibrate, and will not pro-
vide a clean, smooth cut.
Cutting Blades Maintenance
CAUTION: BLADES THAT ARE TOO TIGHT
CAN CAUSE OVERLOADING WHICH MAY
DAMAGE THE EQUIPMENT.
To adjust the cutting blades, refer to the illustrations and
locate the tension screws.
Loosen the tension screw locknuts. Gently turn the ten-
sion screws in until sung, then turn the tension screws
back out 1/4-1/2 turn. While holding the screws in
place, tighten the locknuts. Liberally coat the cutting
blades with light oil. Start the engine and operate the
Hedge Trimmer at full speed for at least one minute.
Stop the engine, and when the blades are motionless,
check the blade temperature carefully.
Upper Blade
Lower Blade
[Cross-sectional view of blades]
Locknut
Tension Screw
The blades may be warm, but if they are too hot to
touch, loosen the tension screws 1/8 turn.
S H A R P
A N D
Locknut
Guide Bar
Flat Washer
Tension Screw
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