Operation; Maintenance - Atlas Copco COBRACOMBI Al-cyl Bedienungsanleitung

Number of revs
The engine speed is regulated by means of the
throttle lever:
Lever released – idling speed
Lever depressed – full engine speed
Ground probing
If the machine is started on top of long tools such
as probing rods; a starter-cord bracket must be
used to prevent the cord from damaging the fuel
tank.
Stopping the engine (Fig. 8)
Stop the engine by depressing the stop button
Drain the fuel tank before transporting the machine,
and when the machine is not to be used for a long
period of time

Operation

Tool shank (Fig. 10)
Use a shank gauge to check that the tool shank is
of the correct size, i.e. H 22x108 mm (7/8" x 4 1/4").
The shank must be clean and the tool must be in
good condition.
Flushing (Fig. 11)
Before drilling, check that the fl ushing hole in the
drill steel is not blocked.
Inserting the tool (Fig. 12)
Stop the machine. Insert the tool into the chuck
and use your foot to lock the tool retainer.
Function selector
Turn the function selector downwards. This will
engage rotation and fl ushing air.
Function selector - breaking (Fig. 13)
To adjust the direction of the tool blade, fi rst put the
function selector in the neutral position.
Now lock the tool blade in the desired position by
turning the selector upwards. The rotation mecha-
nism is now locked.
Collaring
With the engine idling, press the machine and tool
against the spot where you wish to drill. Increase
the engine speed once the drill bit has collared a
drilling (Fig. 13)
–
footing in the rock (or other material).
Grip the side handle for better control of the
machine.
Drilling deep holes (Fig. 14)
First use a short drill steel, and drill it into the hole
fully. Then change to a longer drill steel, with a
slightly smaller bit diameter (approx. 1 mm smaller).
Regular care
Air fi lter (Fig. 15)
In the event of continuous use, check and change
the fi lter at least every shift
1. Unscrew the fi lter cover.
2. Carefully strike the fi lter against the palm of your
hand. Extremely dirty fi lters must be replaced.
The fi lter must never be washed.
Gas duct (Fig. 16)
The gas duct must be checked regularly for carbon
deposits, and cleaned if necessary.
1. Pull the starting handle until the arrow in the
centre of the fl ywheel (which can be seen
through the fan cover) points upwards. This
indicates that the engine piston is in the upper
position.
2. Unscrew the gas duct valve and take out the
cleaning rod. Clean the duct and cleaning rod
using the cleaning needle provided.
3. Clean the cleaning thread.
4. Clean the channel using the cleaning needle
provided.
5. Check that the ball in the gas duct valve is not
stuck.
Decals (Fig. 1)
Replace damaged or worn decals. Order numbers
can be found in the spare-parts list.

Maintenance

Spark plug (Fig. 17)
1. Lift the spark plug cover by the lower lip, and
turn it up to one side.
2. Use a plug spanner to remove the spark plug.
English English
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