Filter
Top Products
11
IF THE SAW GETS STUCK
Stop the engine. Raise the log or change its position, using a thick
branch or pole as a lever. Do not try to pull the saw free. If you do,
you can deform the handle or be injured by the saw chain if the saw
is
suddenly released.
MAINTENANCE
MAINTENANCE, REPLACEMENT, OR REPAIR OF THE EMISSION
CONTROL DEVICES AND SYSTEM MAY BE PERFORMED BY ANY
NON-ROAD ENGINE REPAIR ESTABLISHMENT OR INDIVIDUAL.
Carburetor adjustment (Fig. 28)
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 dealer.
Fig. 28
WARNING
When the engine is idling the cutting attachment must under no
circumstances rotate.
NOTE
Some models sold in areas with strict exhaust emission
regulation do not have high and low speed carburetor
adjustments. Such adjustments may allow the engine to be
operated outside of their emission compliance limits. For these
models, the only carburetor adjustment is idle speed.
If you are not familiar with this type of adjustment, please ask for
assistance from your HITACHI dealer.
Air fi lter (Fig. 29)
The air fi lter (35) 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 (34) and the fi lter (35).
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.
34
35
Fig. 29
Spark plug (Fig. 30)
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
Iow 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. Readjust 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
Fig. 30
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. 31)
Clean the chain oiler port (36) whenever possible.
36
Fig. 31
Guide bar (Fig. 32)
Before using the machine, clean the groove and oiler port (37) in the
bar with the special gauge off ered as an optional accessory.