Adjusting The Release Power; Maintenance Of The Chain Brake - Husqvarna 181 Workshop Manual

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Safety Equipment
A
T
chain brake is assembled in reverse order to dismantling.
Before fitting the front sleeves, the hand guard must be locked (push it down-
wards).
The nut M should be tightened completely.
A r p
The distance between the Swed-o-Matic release screw and the front handle
(B) determines the release power. A smaller gap means reduced release power.
The release power can be checked as follows: Push the guide bar tip against
a spring balance. With a 18" guide bar the chain brake should be released at
a load of 12–17 kp.
The forestry worker could make a rough check on the spot as follows:
Hold the saw horizontally over a trunk, at a height of abt 25 cm. As the saw
by force of its own weight swings around the rear handle and hits the trunk,
the brake should be released.
Note that during this check the engine must not be running.
M c b
Clean the brake band and the mechanism. Check that the band has at least
0.75 mm thickness on the most worn part.
Lubricate the links and supports of the brake mechanism with twostroke oil.
Release and lock the brake repeatedly to check that the mechanism works
smoothly.
Check the chain brake function. Start the saw on clear ground making sure that
the chain runs freely. Apply full throttle and release the chain brake. The chain
should immediately stop rotating.
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