Chain brake ; Starting / Stopping the engine
ENGLISH 12
7. Chain brake
When the chain brake is activated, it stops the saw
chain in a fraction of a second.
Automatic engagement:
In an emergency, the chain brake engages instantly in
response to the inertia caused by kickback.
Please note that even the highly effective
automatic chain brake cannot offer complete
protection against injury. Always work with
great care and always avoid working situations which
would put you at risk of kickback.
Manual activation:
" To manually activate the chain brake, press
the hand protection (3) forwards towards the
guide bar.
As well as providing a quick response in an emergency
situation, manual activation of the saw chain brake is
intended as a means for immobilising the tool in all
situations in which the operator cannot knowingly
control the position of the guide bar or in which the risk
of unintentional contact between the saw chain and a
foreign body or the user himself cannot be entirely
excluded. This particularly applies to starting the engine
and carrying the tool, e.g. when assessing an object or
the surroundings before starting cutting work or when
walking from one working area to the next.
In order to avoid excessive wear, the chain brake
should not be applied until the chainsaw has come to a
standstill – except of course in an emergency. During
start-up, once the engine has started the part throttle
setting should be cancelled as soon as possible by
briefly pulling the throttle control. This ensures that the
engine does not have to work against the blocked chain
for too long under part throttle.
# To release the chain drive (i.e. cancel the
chain brake), pull the hand protection (3) back to
the front handle (4) again
Each time, before commencing your work, check
the function of the chain brake as follows:
• Start the engine (see chapter 8)
• trigger the chain brake at idle speed
• then briefly accelerate to full throttle
• the chain should then not move.
Never operate the chainsaw if it is faulty; instead let a
service workshop check your power tool immediately
8. Starting / Stopping the engine
Every time you pull the starter cord, observe the
correct position and the safe position of the
chainsaw in accordance with the following chapter 8.2
"Starting".
8.1 Start-up settings
Before starting the engine, apply the chain brake
to immobilise the device.
• Set the stop switch (18) to "I".
Type 636, 642 and 643IP:
• When starting the device for the first time, or after
having completely run down the fuel tank and
refuelled, press the primer (21) several times (at
least 5 x) until fuel can be seen in the plastic bubble.
Type 636 and 642:
• Before pulling the starter handle, press the
decompression valve (22) to make the starting
process easier. (Once the engine has started, the
decompression valve automatically jumps back to
the normal position.)
Cold start:
Pull out the choke (7) [this also activates
the part throttle setting, which can be seen
from the pulled-out part throttle control pin
(8)]
Slowly pull the starter handle until a first
resistance is felt, then pull it through in a
fast and strong motion.
Repeat the starting process until the engine audibly and
briefly starts up (ignites).
Then immediately press the choke back
in again. When the engine is restarted
again it then keeps running at part throttle
(visible from the part throttle control pin).
With the engine running, briefly operate
the throttle control to cancel the part
throttle setting (the part throttle control
pin jumps back in again). The engine will
then continue to run at idle speedter.
Warm start:
Start the engine in idle setting with the choke not pulled
out, or start it in
part throttle setting:
by pulling the choke out and pressing it
back in again [the part throttle setting is
activated as a result, which is visible from
the pulled-out part throttle control pin (8)]
Start the engine until it runs, then briefly operate the
throttle control to cancel the part throttle setting (the part
throttle control pin jumps back in again). The engine
then runs on at idle speed.
Fig. 7
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