Hitachi CH50EA Mode D'emploi page 9

5. Maintenance
MAINTENANCE. REPLACEMENT, OR RE-
PAIR OF THE EMISSION CONTROL DE-
VICES AND SYSTEM MAY BE PERFORMED
BY ANY NONROAD ENGINE REPAIR ES-
TABLISHMENT OR INDIVIDUAL.
Carburetor adjustment (Fig. 3-1)
WARNING!
The cutting attachment may be spinning
during carburetor adjustments.
WARNING!
Never start the engine without the complete
clutch cover. 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 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 filter is clean. When the idle
speed is correct, the cutting attachment will not
rotate. If adjustment is required, close (clock-
wise) 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 dealer.
GB-8
Air filter (Fig. 3-2)
The air filter 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 filter daily or more often if working
in exceptionally dusty areas.
Cleaning the air filter
Remove the air filter cover and the filter. Rinse it
in warm soap suds. Check that the filter is dry
before reassembly. An air filter that has been
used for some time cannot be cleaned com-
pletely. Therefore. it must regularly be replaced
by a new one. A damaged filter must always be
replaced.
NOTE!
Saturate the element in 2 cycle oil or the
equivalent. Squeeze the element to distribute
the oil completely and to remove any excess oil.
Fig. 2-6B
Fig. 3-2
Fig. 3-1