Maintenance - Hitachi Koki CS 51EAP Bedienungsanleitung

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. 28)
29. Relieving cut
30. Cross cut
31. Pressure on top
32. Pressure side
33. Tension 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
chain saw towards you, followed by previous procedure.
(Fig. 29)
If the log is lying on the ground make a boring cut to avoid
cutting into the ground. Finish with a bottom cut. (Fig. 30)
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. 31)
35. Relieving cut
36. Cross cut
37. Pressure on bottom
38. Tension side
39. Pressure side
40. 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. 32)
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. 33)
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. 34)
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. 35)
The air fi lter (41) 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.
Remove the air fi lter cover (42) and the fi lter (41).
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. 36)
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.
Oiler port (Fig. 37)
Clean the chain oiler port (43) whenever possible.
Guide bar (Fig. 38)
Before using the machine, clean the groove and oiler port
(44) in the guide bar.
Side case (Fig. 39)
Always keep the side case and drive area clean of saw dust
and debris. Periodically apply oil or grease to this area to
protect from corrosion as some trees contain high levels of
acid.
NOTE
Pull up the front hand guard towards you and release the
brake to remove or install the side case.
Fuel fi lter (Fig. 40)
Remove the fuel fi lter (45) from the fuel tank and thoroughly
wash it in solvent. After that, push the fi lter into the tank
completely.
NOTE
If the fuel fi lter (45) is hard due to dust and dirt, replace it.
Chain oil fi lter (Fig. 40)
Remove the oil fi lter (46) and thoroughly wash it in solvent.
After that, push the fi lter into the tank completely.
NOTE
If the oil fi lter (46) is hard due to dust and dirt, replace it.
Cleaning the cylinder fi ns (Fig. 41)
When wood chips are caught between cylinder fi ns (47),
the engine may overheat, resulting in lower output. To avoid
this, always keep cylinder fi ns and fan case clean.
13
English