14
English
NOTE
Standard Idle rpm is 2,800 – 3,200 min
–1
.
WARNING
When the engine is idling the cutting
attachment must under no circumstances
rotate.
Air fi lter (Fig. 24)
The air fi lter (29) must be cleaned from dust and dirt
in order to avoid:
○ Carburetor malfunctions
○ Starting problems
○ Engine power reduction
○ Unnecessary wear on the engine parts
○ Abnormal fuel consumption
Clean the air fi lter daily or more often if working in
exceptionally dusty areas.
29
Fig. 24
Cleaning the air fi lter
Open the air fi lter cover and remove the air fi lter
(29). Rinse it in warm soap suds. Check that the
fi lter is dry before reassembly. An air fi lter that
has been used for some time cannot be cleaned
completely. Therefore, it must regularly be replaced
with a new one. A damaged fi lter must always be
replaced.
MAINTENANCE
MAINTENANCE, REPLACEMENT OR REPAIR
OF THE EMISSION CONTROL DEVICES AND
SYSTEMS MAY BE PERFORMED BY ANY NON-
ROAD ENGINE REPAIR ESTABLISHMENT OR
INDIVIDUAL.
Carburetor adjustment (Fig. 23)
Fig. 23
WARNING
● The cutting attachment may be spinning
during carburetor adjustments.
● Never start the engine without the complete
clutch cover and tube assembled! Otherwise
the clutch can come loose and cause
personal injuries.
In the carburetor, fuel is mixed with air. When the
engine is test run at the factory, the carburetor is
basically adjusted. A further adjustment may be
required, according to climate and altitude. The
carburetor has one adjustment possibility:
T = Idle speed adjustment screw.
Idle speed adjustment (T)
Check that the air fi lter is clean. Be sure the cutting
attachment stop turning when the engine idle. When
the idle speed is correct, the cutting attachment
will not rotate. If adjustment is required, close
(clockwise) the T-screw, with the engine running,
until the cutting attachment starts to rotate. Open
(counter-clockwise) the screw until the cutting
attachment stops. You have reached the correct
idle speed when the engine runs smoothly in all
positions well below the rpm when the cutting
attachment starts to rotate.
If the cutting attachment still rotates after idle speed
adjustment, contact Hitachi Authorized Service
Centers.
000BookCG22EAP2US.indb14000BookCG22EAP2US.indb14 2015/08/0515:48:362015/08/0515:48:36
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