britech Bt 42/40CS Mode D'emploi page 40

GB
Fig. 32
e) Before starting each job, check manually that the
lever click releases both forwards and backwards.
It is recommended that the check be performed with
the engine running at minimum and for a short time.
If the click releases do not occur or
operation of the lever has become
stiff, do not use the chainsaw. Contact a
qualified service centre.
Periodically remove all shavings and sawdust
from the visible parts of the chain brake
mechanisms.
Do not attempt repairs or modifica-
tions.
8.4 CHAIN
MAINTENANCE AND SHARPENING
- When the chain is properly sharpened, the work
is not tiring, the cutting yield is high, and there is
no abnormal wear on the mechanical parts or
the bar.
- If the chain is not sufficiently lubricated, increase
the oil flow by rotating the setting screw of the
pump anticlockwise (Fig. 17).
- Before sharpening, the chain must be
made taught by means of the chain
tensioner (Fig. 9) see the section on
"MOUNTING THE BAR AND CHAIN ".
40
CHAIN SAW OPERATING MANUAL
STOP
- After sharpening, slacken the chain as per the
mounting instructions.
- During sharpening, lock the chain, using the
brake.
- Use a round file (specific for chains) 5/32" (4
mm) in diameter (Fig. 18 part.1).
Observe the sharpening angle as in (Fig. 18
part.2-3).
- Sharpen by filing from the inside outwards (Fig.
18 part. 5) all the teeth on one side and then all
the teeth on the other.
- Position the blade in such a way that it projects
about 1 mm (Fig. 18 part. 4) above the level of
the cutting edges.
8.5 "MINIMUM" ENGINE RPM ADJUSTMENT
- SCREW [t]
- The carburettor of your chainsaw has been set
at standard values during manufacture. To
regulate minimum engine rpm, only screw [T]
can be used (fig. 19).
Because such adjustment requires specific
training and work tools, always contact
an AUTHORISED AFTER-SALES SERVICE.
Screw [T]: hold the butterfly valve slightly open
so as to be able to regulate the "MINIMUM"
rpm at an appropriate rotation speed.
C A U T I O N - H A Z A R D ! ! A h i g h
adjustment of the "minimum" rpm
could trigger the centrifugal clutch and set
the cutting chain in motion even when the
throttle lever is released.