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Maintenance
Maintenance, replacement or repair of emission
control devices and systems may be performed by
any repair establishment or individual; however,
warranty repairs must be performed by a dealer or
service center authorized by Maruyama
Manufacturing Company, Inc. The use of parts that
are not equivalent in performance and durability to
authorized parts may impair the effectiveness of the
emission control system and may have a bearing on
the outcome of a warranty claim.
Idle Speed Adjustment
This Trimmer is equipped with non-adjustable fuel
mixture carburetor. The engine idle speed is the only
adjustment for the operator.
The cutting head may be rotating during idle speed
adjustment. Wear the recommended personal protec-
tive equipment and observe all safety instructions.
Keep hands and body away from the cutting head.
When the throttle trigger is released, the engine should
return to an idle speed between 2700 and 3300 RPM, or
just below the clutch engagement speed. The cutting
head must not rotate and the engine should not stall
(stop running) at engine idle speed.
To adjust the engine idle speed, rotate the idle speed
adjustment screw on the carburetor.
• Turn the idle speed screw in (clockwise) to
increase the engine idle speed.
• Turn the screw out (counterclockwise) to decrease
the engine idle speed.
If idle speed adjustment is necessary, and after
adjustment the cutting head rotates or the engine
stalls, stop using the Trimmer immediately!
Contact your local authorized Maruyama Dealer for
assistance and servicing.
Air Filter
Maintenance Interval
• The air filter should be cleaned daily, or more
often when working in extremely dusty condi-
tions.
• Replace after every 100 hours of operation.
WARNING
POTENTIAL HAZARD
• Engine must be running to make some
carburetor adjustments.
• When engine is running, cutting head is
rotating and other parts are moving.
WHAT CAN HAPPEN
• Contact with rotating cutting head or
other moving parts could cause serious
personal injur y or death.
HOW TO AVOID THE HAZARD
• Keep hands, feet and clothing away from
cutting head and other moving parts.
• Keep all bystanders and pets away from
unit while making carburetor adjust-
ments.
WARNING
• I d l e s p e e d a d j u s t m e n t s h o u l d b e
checked each time the unit is operated.
Idle Speed Adjuster Screw
