Checking For Wear On The Tool Shank; Operation; Start And Stop; Cold Start - Atlas Copco Cobra MK1 Sicherheitshinweise Und Betriebsanleitung

Safety and operating instructions

Checking for wear on the tool shank

Use the gauge that corresponds to the insertion tool's
shank dimension. 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. See section "Technical data"
for correct tool shank dimensions.

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 knop 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.
16
A

Restarting a warm machine

1. Press the decompression knop.
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 knop.
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 leverage.
© 2008 Atlas Copco Construction Tools AB | No. 9800 0665 90 | 2008-10-28
COBRA MK1, TT, TT-AWD