Checking Operation Spring; Of Coasting Brake; Brake Spring Anchor - Stihl MS 270 User Manual

5.5.6 Checking Operation of
Coasting Brake
Check operation of the brake with
the bar and chain mounted.
When starting the machine observe
country-specific safety regulations
and the safety precautions in the
owner's manual.
– With the engine running, open
the throttle wide.
– Release the rear handle.
The chain must come to a standstill
in less than one second.
If the brake does not operate
properly, service the sliding and
bearing points shown in the
illustrations as follows:
Lubricate bearing points (arrows)
of interlock and switch levers with
Mobilplex grease – see
30
2
Lubricate brake lever bearing
points (1) with grease –
Coat outside diameter of clutch
drum (2) with chain oil –
If lightly contaminated:
– Clean all parts with a brush and
STIHL cleaner –
If heavily contaminated or
clogged with resin:
– Remove the parts concerned and
clean in STIHL cleaner –
– Replace worn or damaged parts.
– Before re-installing parts, clean
machine recesses and seats with
STIHL cleaner –
If a biological chain oil is preferred,
STIHL recommends the use of
rapidly biodegradable STIHL
Bioplus.
To guarantee troublefree operation,
use only original STIHL replace-
ment parts as per the latest parts
list.
14.
5.6
1
1
2
Removing
see 14.
The anchor pin (1) must be replaced
if it is worn or damaged:
see 14.
– Remove the fan cover
– see
– Remove the chain brake spring
see 14. – see 5.4.2
– Remove the shroud –
Use a suitable punch to drive the
anchor pin (1) out of the
see 14. crankcase in the direction of the
arrow.
Do not drive out the pin in the other
direction as this would damage the
annular bead which was formed in
see 14. the crankcase bore when the pin
was originally installed. In such a
case neither the new anchor pin nor
the brake spring would locate
properly. Furthermore, the
crankcase could be damaged in this
way and possibly impair correct
operation of the chain brake.
Brake Spring Anchor Pin
1
8.2.
or see 5.5.1.
see 6.4.
MS 270, MS 280