11
English
LIMBING
Limbing is removing the branches from a feller tree.
WARNING
A majority of kickback accidents occur during Iimbing.
Do not use the nose of the guide bar. Be extremely cautious and
avoid contacting the log, other limbs or objects with the nose
of the guide bar. Be extremely cautious of limbs under tension.
They can spring back towards you and cause loss of control
resulting in injury. (
Fig.
24
)
Stand on the left side of the trunk. Maintain a secure footing and
rest the saw on the trunk. Hold the saw close to you so that you are
in full control of it. Keep well away from the chain. Move only when
the trunk is between you and the chain. Watch out for spring back of
limbs under tension.
LIMBING
THICK
BRANCHES
When limbing thick branches, the guide bar may get pinched easily.
Branches under tension often snap up, so cut troublesome branches
in small steps. Apply the same principles as for cross cutting. Think
ahead and be aware of the possible consequences of all your
actions.
CROSS
CUTTING/BUCKING
Before starting to cut through the log, try to imagine what is going to
happen. Look out for stresses in the log and cut through it in such a
manner that the guide bar will not get pinched.
CROSS
CUTTING
LOGS,
PRESSURE
ON
TOP
Take a
fi
rm stance. Begin with an upper cut. Do not cut too deeply,
about 1/3 of the log diameter is enough. Finish with a bottom cut.
The saw cuts should meet. (
Fig.
25
)
24. Relieving cut
25. Cross cut
26. Pressure on top
27. Pressure side
28. Tension side
29. Relative depth of saw cuts
THICK
LOG,
LARGER
THAN
GUIDE
BAR
LENGTH
Begin by cutting on the opposite side of the log. Pull the saw towards
you, followed by previous procedure. (
Fig.
26
)
If the log is lying on the ground make a boring cut to avoid cutting into
the ground. Finish with a bottom cut. (
Fig.
27
)
WARNING
KICKBACK
DANGER
Do not attempt a boring cut if you are not properly trained. A
boring cut involves the use of the nose of the guide bar and can
result in kickback.
CROSS
CUTTING
LOGS,
PRESSURE
ON
BOTTOM
Take a
fi
rm stance. Begin with a bottom cut. The depth of the cut
should be about 1/3 of the log diameter.
Finish with an upper cut. The saw cuts should meet. (
Fig.
28
)
30. Relieving cut
31. Cross cut
32. Pressure on bottom
33. Tension side
34. Pressure side
35. Relative depth of saw cuts
THICK
LOG,
LARGER
THAN
GUIDE
BAR
LENGTH
Begin by cutting on the opposite side of the log. Pull the saw towards
you, followed by previous procedure. Make a boring cut if the log is
close to the ground. Finish with a top cut. (
Fig.
29
)
WARNING
KICKBACK
DANGER
Do not attempt a boring cut if you are not properly trained. A
boring cut involves the use of the nose of the guide bar and can
result in kickback. (
Fig.
30
)
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.
31)
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.
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.
32)
The air
fi
lter (36) 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 (37) and the
fi
lter (36).
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.
Spark
plug
(Fig.
33)
The spark plug condition is in
fl
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 di
ffi
culties. If the engine is
low on power, di
ffi
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.
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.
34)
Clean the chain oiler port (38) whenever possible.
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2010/09/03 14:50:32
