Stihl MS 192 T Manual page 22

: Slip sprocket (1) onto crankshaft
stub.
The sprocket must engage the
studs (arrow) of the wormwheel.
– Reassemble remaining parts in
reverse order.
MS 192 T
7. Checking Operation of
Chain Brake
The chain brake is one of the most
important safety devices on the
chainsaw. Its efficiency is measured
in terms of the chain braking time,
i.e. the time that elapses between
activating the brake and the saw
1
chain coming to a complete
standstill. The shorter the braking
time, the better the efficiency and
protection offered against being
injured by the rotating chain.
The coefficient of friction is impaired
by contamination (with chain oil,
chips, fine particles of abrasion,
etc.) and smoothing of the friction
surfaces on the brake band and
clutch drum. This in turn reduces
the frictional forces and thus
prolongs the braking time. A
fatigued or stretched brake spring
has the same negative effect.
– Start the engine.
– With the chain brake activated
(locked), open the throttle wide
for a brief period
(max. 3 seconds) – the chain
must not rotate.
– With the chain brake released,
open the throttle wide and
activate the brake manually – the
chain must come to an abrupt
stop.
The braking time is in order if
deceleration of the saw chain is
imperceptible to the eye.
If the chain brake does not operate
properly, see troubleshooting chart,
b 4.2.
7.1 Removing and Installing
1
Removal
– Troubleshooting, b 4.2
– Remove the sprocket cover and
bar and chain, b 5.1
: Engage the chain brake by
pushing the hand guard (1)
downwards.
The brake spring of the brake band
is now relaxed.
: Take out the screws (arrows).
21