Regular Service; Fault Finding - Atlas Copco Pionjar 120 Instrucciones Para El Operario

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Drilling deep holes (fig. 11)
First drill a short drill steel all the way into the hole.
Then change to a longer drill steel with a slightly
smaller bit diameter (approx. 1 mm smaller).

Regular service

Air filter (fig. 12)
Clean the air filter regularly, at least once a shift if
the machine is in continuous use.
Turn the locking spring of the filter housing to the
side, and take out the filter housing and filter. Tap
the filter carefully with the palm of your hand, or
blow through it carefully with compressed air.
N.B. Blow from the inside out.
If the filter is very dirty, it should be replaced.
Paper filters must never be washed.
Gas duct (fig. 13)
The gas duct must be checked regularly and
cleaned of carbon deposits.
Pull the starter handle slowly until the arrow at the
centre of the flywheel points upward (which means
that the engine piston is at its upper turning posi-
tion). Unscrew the gas-duct valve and take out the
cleaning rod. Use the accompanying cleaning nee-
dle to clean both the duct and the cleaning rod.
Check that the ball in the gas-duct valve is not
stuck.
Maintenance
Spark plug (fig. 14)
Remove the spark-plug cap and then remove the
spark plug with the aid of a plug spanner.
If the spark plug is dirty or burned, it should be re-
placed. Use an original spark plug type Motorcraft
AE6 or Bosch W7A.
If the spark plug is wet with fuel, dry it with a clean
cloth and check the spark. Then pull the starting
handle 2-3 times to get rid of any excess fuel.
Fit the spark plug back into the cylinder.
The electrode gap should be 1.5 mm.
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Changing the starter cord (figs. 15a-
15d)
Remove the protective cover of the starter mecha-
nism, at the same time grasping the starter pulley
so that it comes off with the cover. Carefully let the
cover rotate in order to release the spring tension.
Remove the old starter cord.
Fit the new starter cord.
Check the gasket between the fuel tank cover and
the protective cover. Oil the starter pulley's needle
bearing. Fit together the starter pulley and protec-
tive cover, with the starter spring fixed into the
starter pulley. Wind all of the cord on to the starter
pulley.
Pre-tension the starter spring by turning the pulley
clockwise by approx. 360° relative to the cover be-
fore mounting the assembly. Pull the starter handle
carefully in order to locate the cover correctly. Fit
and tighten the nuts for the protective cover.
Chuck bushing (fig. 16)
I the chuck gauge provided can be inserted all the
way into the chuck bushing (i.e. between the flats
of the bushing), this indicates that the bushing is
worn out and must be replaced.

Fault finding

If the machine does not start, is difficult to start,
runs unevenly or has low power output, check the
figures 2 - 16.
If, after checking the figures, the machine still does
not function satisfactorily, please contact your near-
est Pionjär workshop.
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