Maintenance - Hitachi CS 33EB Handling Instructions Manual
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Also See for CS 33EB:
- Handling instructions manual (221 pages) ,
- Instruction manual (64 pages) ,
- Service manual (15 pages)
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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. 20)
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. 21)
23. Relieving cut
24. Cross cut
25. Pressure on top
26. Pressure side
27. Tension side
28. 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. 22)
If the log is lying on the ground make a boring cut to avoid cutting
into the ground. Finish with a bottom cut. (Fig. 23)
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. 24)
29. Relieving cut
30. Cross cut
31. Pressure on bottom
32. Tension side
33. Pressure side
34. 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. 25)
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. 26)
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. 27)
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
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 Hitachi Authorized Service Centers.
Air fi lter (Fig. 28)
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 (36) 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.
Spark plug (Fig. 29)
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. 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.
Page 24
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