Checking for wear on the tool shank
Use the gauge that corresponds to the insertion tool’s
shank dimension. See section "Technical data" for
correct tool shank dimensions.
● Check if the gauge’s hole (A) can be pushed down
on the insertion tool’s shank, this means that the
shank is worn out and the insertion tool should be
replaced.
● Check the length (B), that it is according to the
ordered machine type.
Operation
WARNING Involuntary start
Involuntary start of the machine may cause injury.
► Keep your hands away from the start and stop
device until you are ready to start the machine.
► Learn how the machine is switched off in the event
of an emergency.
Start and stop
Cold start
1. Slide the start button on the left handle
backwards.
2. Close the choke by turning the choke control
upwards.
3. Pump 5 times on the primer pump.
4. Press the decompression knob on the right side
of the engine cylinder.
5. Depress the throttle lever to full throttle and pull
on the starter handle.
6. When the machine starts, open the choke by
turning the choke control downwards.
7. Warm up the engine for 2–3 minutes.
Restarting a warm machine
1. Press the decompression knob.
2. Do not touch the throttle lever.
3. Check that the choke is open and pull on the
starter handle.
Restarting an overheated machine
If a hot engine stops after a short while, it can be due
to vapour lock. Use the following restart procedure:
1. Press the decompression knob.
2. Close the choke by turning the choke control
upwards.
3. Depress the throttle lever to full throttle and pull
on the starter handle.
4. When the machine starts, let it run for few
seconds then open the choke gradually to fully
open (this can take up to 30 seconds).
Stopping
1. Stop the machine by sliding the stop button on
the left handle forwards.
Operating
Starting a cut
♦
Stand in a stable position with your feet well away
from the inserted tool.
♦
Press the machine against the working surface
before you start.
♦
The impact unit is activated when the machine is
pressed down and loaded. When the machine is
lifted, the impact unit disengages automatically.
♦
The working speed of the machine is controlled
via the throttle lever.
♦
Start collaring at such a distance from the edge
that the machine is capable of breaking the
material without levering.
© 2010 Atlas Copco Construction Tools AB | No. 9800 0995 93 | 2010-01-12
Original instructions
16
COBRA PRO, TT, TT-AWDSafety and operating instructions
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