Maintenance - Hitachi CS 33EB Handling Instructions Manual

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. 29)
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 fi lter is clean. 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.
WARNING
When the engine is idling the cutting attachment must under no
circumstances rotate.
NOTE
Do not touch the High speed adjustment (H) and the Low speed
adjustment (L).
Those are only for Hitachi Authorized Service Centers.
If you rotate them, It will cause a serious damage to the machine.
Air fi lter (Fig. 30)
The air fi lter (37) 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.
Cleaning the air fi lter
Remove the air fi lter cover (38) and the fi lter (37). Rinse them 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.
12
Fig. 29
Spark plug (Fig. 31)
The spark plug condition is infl uenced by:
○ An incorrect carburetor setting.
○ Wrong fuel mixture (too much oil in the gasoline).
○ A dirty air fi lter.
○ Hard running conditions (such as cold weather).
These factors cause deposits on the spark plug electrodes, which
may result in malfunction and starting diffi culties. If the engine is low
on power, diffi cult to start or runs poorly at idling speed, always check
the spark plug fi rst. If the spark plug is dirty, clean it and check the
electrode gap. Re-adjust if necessary. The correct gap is 0.6 mm.
The spark plug should be replaced after about 100 operation hours
or earlier if the electrodes are badly eroded.
0.6 mm
NOTE
In some areas, local law requires using a resistor spark plug
to suppress ignition signals. If this machine was originally
equipped with resistor spark plug, use same type of spark plug
for replacement.
Oiler port (Fig. 32)
Clean the chain oiler port (39) whenever possible.
Guide bar (Fig. 33)
Before using the machine, clean the groove and oiler port (40) in the
bar with the special gauge off ered as an optional accessory.
38
37
Fig. 30
Fig. 31
39
Fig. 32