Winter Operation - Stihl MS 240 Instruction Manual

English
The chain brake will operate only if the
hand guard has not been modified in any
way.
Check operation of the chain brake
Before starting work: Run engine at idle
speed, engage the chain brake (push
hand guard toward bar nose) and open
the throttle wide for no more than
3 seconds – the chain must not rotate.
The hand guard must be free from dirt
and move freely.
Chain brake maintenance
The chain brake is subject to normal
wear. It is necessary to have it serviced
and maintained regularly by trained
personnel. STIHL recommends that you
have servicing and repair work carried
out exclusively by an authorized STIHL
servicing dealer. Maintain the following
servicing intervals:
Full-time usage: every 3
months
Part-time usage: every 6
months
Occasional usage: every 12
months
22

Winter Operation

At temperatures below +10°C
N Turn the lever above the rear handle
90° counterclockwise.
N Lift off the carburetor box cover
vertically.
1
N Pry the shutter (1) out of the
carburetor box cover.
2
N Slide the shutter into the slot (2) at
the bottom end of the carburetor box
cover.
At temperatures above +20°C:
Return shutter to the "summer"
position. This is necessary to
avoid engine running problems
and overheating.
N Refit the carburetor box cover and
lock it with the lever.
Heated air is now drawn in from around
the cylinder and mixed with cold air –
this helps prevent carburetor icing.
At temperatures below -10°C
It is advisable to fit the intake air
preheating kit (special accessory) if you
use your saw in extremely cold
conditions (temperatures below -10°C,
in powder or drifting snow).
When fitted, the kit ensures that only
heated air is drawn in from around the
cylinder – this helps prevent air filter and
carburetor icing.
The shutter for carburetor preheating
must be in the "winter" position when the
intake air preheating kit is fitted.
MS 240