Chain Brake; Checking Operation - Stihl MS 210 Service Manual

2
1
: Attach one end of each spring (1)
to the clutch shoes.
: Use the hook (2) 5910 890 2800
to attach other ends of springs
and press them firmly into the
clutch shoes.
: Screw on the clutch and tighten
down to 50 Nm (37 lbf.ft).
– Install the clutch drum / chain
sprocket – b 5.1.
18
– Remove locking strip from the
cylinder.
– Insert spark plug and tighten
down to 25 Nm (18.5 lb.ft).
: If spark plug has a separate
terminal nut, make sure it is
properly tightened down.
– Fit boot on the spark plug.
: Fit the shutter so that its lugs
engage the recesses in the
handle housing.
– Install the air filter – b 11.1.
5.4

Chain Brake

5.4.1

Checking Operation

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. The shorter the braking
time, the better the efficiency and
protection offered against being
injured by the rotating chain.
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.
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 throttle wide for a
brief period (max. 3 seconds) –
the chain must not rotate.
– With the chain brake released,
open 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.
MS 210, MS 230, MS 250