Hitachi CS 33EDTP Bedienungsanleitung Seite 13

25. Hinge
26. Felling cut
Never saw completely through the trunk. Always leave a
hinge.
The hinge guides the tree. If the trunk is completely cut
through, you lose control over the felling direction.
Insert a wedge or a felling lever in the cut well before the tree
becomes unstable and starts to move. This will prevent the
guide bar from binding in the felling cut if you have misjudged
the falling direction. Make sure no people have come into the
range of the falling tree before you push it over.
FELLING CUT, TRUNK DIAMETER MORE THAN TWICE
GUIDE BAR LENGTH
Cut a large, wide notch. Then cut a recess into the center of
the notch. Always leave a hinge on both sides of the center
cut. (Fig. 24)
Complete the felling cut by sawing around the trunk as in
the Fig. 25.
WARNING
These methods are extremely dangerous because they
involve the use of the nose of guide bar and can result in
kickback.
Only properly trained professionals should attempt these
techniques.
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. 26)
Stand on the left side of the trunk. Maintain a secure footing
and rest the chain saw on the trunk. Hold the chain 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. 27)
27. Relieving cut
28. Cross cut
29. Pressure on top
30. Pressure side
31. Tension side
32. Relative depth of saw cuts
THICK LOG, LARGER THAN GUIDE BAR LENGTH
Begin by cutting on the opposite side of the log. Pull the
chain saw towards you, followed by previous procedure.
(Fig. 28)
If the log is lying on the ground make a boring cut to avoid
cutting into the ground. Finish with a bottom cut. (Fig. 29)
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. 30)
33. Relieving cut
34. Cross cut
35. Pressure on bottom
36. Tension side
37. Pressure side
38. Relative depth of saw cuts
THICK LOG, LARGER THAN GUIDE BAR LENGTH
Begin by cutting on the opposite side of the log. Pull the
chain 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. 31)
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. 32)
IF THE CHAIN 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 chain
saw free. If you do, you can deform the handle or be injured
by the saw chain if the chain saw is suddenly released.
MAINTENANCE
Carburetor adjustment (Fig. 33)
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. 34)
The air fi lter (41) and cleaner sponge (40), (42) 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.
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