20 MS 362, MS 362 C
5. Chain Brake
5.1 Checking Operation
The chain brake is one of the most
important safety devices on the
chain saw. Its efficiency is
measured in terms of the chain
braking time, i.e. the time that
elapses between activating the
brake and the saw chain coming to
a complete standstill.
Contamination (with chain oil, chips,
fine particles of abrasion, etc.) and
smoothing of the friction surfaces of
the brake band and clutch drum
impair the coefficient of friction,
which 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.
Machines with QuickStop Super
With the chain brake released, open
the throttle wide and release the
interlock lever on the rear handle –
the chain must come to an abrupt
stop.
The braking time is in order if
deceleration of the saw chain (less
than a second) is imperceptible to
the eye.
If the chain brake does not operate
properly, refer to troubleshooting,
b 3.2.
5.2 Brake Band
– Remove the clutch drum, b 4.1
– Troubleshooting, b 3.2
: Take out the screw (arrow) and
remove the side plate (1).
Machines with Quick Chain
Tensioner
: Take out the screw (arrow) and
remove the side plate (1).
: Take out the screws (arrows).
– Remove the cover (1).
19RA042 TG
1
1
0001RA016 TG
1
0001RA017 TG
– Engage the chain brake.
The brake band is now tensioned.
: Remove the screw (1) from the
underside of the machine.
: Pry the brake band (1) out of its
seat (arrow).
– Remove the brake band (1).
Do not overstretch the brake band.
– Pull the hand guard towards the
handlebar to simplify assembly of
the brake band.
1
0001RA019 TG
1
0001RA020 TG
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