Checking Operation; Of Chain Brake; Brake Band, Removal - Stihl MS 441 Manual

The clutch drum is correctly seated
in the carrier of the wormwheel
when the crankshaft stub protrudes
approx. 5 mm (= distance a) from
the clutch drum.
1 2
– Fit rim sprocket (1).
: Fit washer (2) with the flange
facing towards the chain sprocket
cover.
1
: Insert circlip (1) in the groove of
the crankshaft stub.
– Reassemble all other parts in the
reverse sequence.
MS 441, MS 441 C
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
chain coming to a complete
standstill.
Contamination (particularly 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. This in turn
extends 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 OK if
deceleration of the saw chain is
imperceptible to the naked eye.
Machines with QuickStop Super
– With the chain brake released,
open the throttle wide and
release the trigger interlock in the
rear handle – the chain must
come to an abrupt stop.
The chain must come to a complete
stop within less than one second.
If the chain brake does not operate
properly, refer to the
troubleshooting chart, b 4.2.
7.1 Brake band, removal and
installation
– Troubleshooting chart, b 4.2.
– Remove chain sprocket cover,
bar and chain, b 5.
: Take out screw (arrow).
: Remove side plate (1).
: Take out screws (arrows).
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