Husqvarna 50 Rancher - Manual (Page 3)

MAINTAINING THE CHAIN BRAKE
This chain saw is equipped with a new type of automatic chain brake
that has been adjusted at the factory. It will need no further adjust­
ment.
Release the chain brake as soon as you move or cease working even
if it is for a short break. Push the front hand guard to release the
brake. • -
During the break: •
Check that the brake mechanism works smoothly.
If not, remove resin and sawdust. Check that supports and sliding
surfaces are lubricated with grease or temperature-resistant engine
oil.
Apply full throttle and release the chain brake. The chain should
immediately stop rotating.
ADJUSTING THE CARBURETTOR
The carburettor has three adjusting screws;
L = Low speed needle
H = High speed needle
T = Throttle adjusting screw
The carburettor is adjusted as follows:
1. Clean the air filter.
2. Screw the needles H and L carefully right in.
3. Then screw the needles out to recommended basic position:
H = 1 turn out
L = 1 turn out
I I
4. Start the engine and warm it up. Adjust the idling speed by means
of the throttle adjusting screw so that the chain starts rotating.
5. Adjust the low speed needle to reach the highest speed at which
the engine is still idling. Then screw the needle out equivalent to
10 minutes on a clock-face.
«1»
'
Use the followiuy tc cìil - lk liiat ihu auU'iiatiL -^hain brake
actuates correctly;
Hold the chain saw horizontally abt 20 cm over a trunk. NOTE! Switch
off the engine! Release your grip on the front handle. As the saw by
force of its own weight swings around the rear handle and the guide
bar tip hits the trunk, the brake should actuate.
At the service workshop:
Check that the brake mechanism and the brake band are free from
sawdust and dirt.
Check the wear of the brake band. In unbraked position it must not
touch the clutch drum.
Check the wear of the chain brake mechanism.
Check that the front hand guard is not damaged.
Lubricate the supports and gliding surfaces of the front hand guard
with grease or temperature-resistant engine oil.
Again adjust the idling speed by means of the throttle screw (see
under 4 above) so that a speed of approx 2,500 r/min is received.
Apply full throttle. At correct adjustment of the high speed needle,
the engine should be fourstroking.
If this is not the case screw out the needle to reach a distinct
fourstroke.
Engine speed: Maximum 12,500 r/min.
NOTE!
Should the engine not be fourstroking, there is a risk
of piston seizure.
Adjust the high speed needie for maximum power and not
for maximum speed!