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MAINTENANCE
30 – English
High speed jet H
This chain saw is equipped with a carburettor that has a
built-in fixed high speed jet.
CAUTION! There is an integrated speed governor in the
ignition that limits the maximum speed to 12,000 rpm.
Adjusting the jet therefore has no effect on the maximum
speed. The high speed jet affects the chain saw’s power.
CAUTION! Setting the high speed jet too lean reduces the
engine’
s power and causes overheating. This results in
engine damage.
Correctly adjusted carburettor
When the carburettor is correctly adjusted the machine
accelerates without hesitation and burbles a little at full
throttle. It is also important that the chain does not rotate
at idle. If the L-jet is set too lean it may cause starting
difficulties and poor acceleration. If the H-jet is set too
lean the machine will have less power, poor acceleration
and could suffer damage to the engine. If the L and H-jets
are set too rich it will lead to acceleration problems or too
low a working speed.
Checking, maintaining and
servicing chain saw safety
equipment
Chain brake and front hand guard
Checking brake band wear
Brush off any wood dust, resin and dirt from the chain
brake and clutch drum. Dirt and wear can impair
operation of the brake.
Regularly check that the brake band is at least 0.6 mm
thic
k at its thinnest point.
Checking the front hand guard
Make sure the front hand guard is not damaged and that
there are no visible defects such as cracks.
Move the front hand guard forwards and back to make
sure it mo
ves freely and that it is securely anchored to the
clutch cover.
Checking the inertia brake release
Place the chain saw, with the engine switched off, on a
stump or other stable surface. Release the front handle
and let the saw fall by its own weight, rotating around the
rear handle towards the stump.
When the bar hits the stump the brake should be
applied.
Note! All service and repair work on the machine
demands special training. This is especially true of the
machine’s safety equipment. If your machine fails any of
the checks described below we recommend that you
take it to your service workshop.