Chain Brake Repair - Stihl 28 Service Manual

12
2.3,,2 Chain Brake
Detaching the tension spring
The clutch drum must be removed
before the brake band can be disas-
sembled" To do this, engage the
chain brake and detach the tension
spring" Remove retaining washer
from brake lever's pivot pin and
carefully withdraw the brake lever"
Collect the washers and helical
spring on the brake band's pivot pin"
The other end of the brake band can
now be prised out of its seat in the
crankcase"
Take out the clutch before removing
the release plate" Remove the re-
taining washers, washers and heli-
cal springs from the guide pins and
take the release plate out of the
crankcase"
Unscrew the handguard (the chee-
se-head screws will be difficult to
remove because they are fitted with
LOCTITE) and then take out the
actuating lever, relay lever and tor-
sion spring"
Top:
Removing retaining washer
Center and Bottom:
Unscrewing the handguard
The spring guide pins in the crank-
case must be replaced if they are
damaged"
These screw pins must be bonded
in position to prevent them loose-
ning in operation" To do this, use a
suitable solution (trichlorethlene,
diluted nitro or similar) to complete-
ly degrease the threads in the crank-
case and on the pins themselves,
Then coat the threads of the screw
pins with a little adhesive - 101, part
number 0786 111 1101, (LOCTITE
242) - and screw them into the
crankcase, Tighten to a torque of 4,,9
Nm (0.5 kpm).
It is essential to use a suitable
screwdriver with a tip which fits
snugly in the slot of the pin in order
to avoid damaging the pin materiaL
A 1 x 6.5 screwdriver in accordance
with DIN 5265 is recommended for
this purpose"