Fault Finding - Atlas Copco Cobra Combi Al-cyl Instrucciones Para El Operario

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3. If the spark plug is dirty or burned, it must be
replaced. Use original Bosch WR7AC spark
plugs.
4. If the pin has been dampened by fuel, dry it off
and check the ignition spark, and pull 2-3 times
on the starter handle to ventilate off any excess
fuel.
5. Now fi t the spark plug back into cylinder.
The electrode gap should be 1.5 mm (0.060 in.).
Changing the starting cord (Fig. 18)
1. Remove the screw-cap of the PTO. Remove the
three hex. bolts from the protective cover of the
starting mechanism.
2. Lift off the cover, grasping the starter pulley as
well. Let the cover rotate carefully against the
starter pulley, to release the spring tension.
3. Remove the old starting cord (fi g. 18).
Fit a new cord (Fig. 19).
1. Oil the needle bearing in the starter pulley.
2. Fit together the starter pulley and protective
cover, so that the starting spring locates in the
starter pulley.
3. Wind the full length of the cord on to the pulley.
4. Pre-tension the starting spring by about one
turn (clockwise) before fi tting the assembly into
place.
5. Pull the starting handle carefully, in order to
locate the cover correctly.
6. Fit and tighten the hex. bolts and the PTO
screw-cap.
Tool chuck (Fig. 20)
If the chuck gauge provided can be inserted
fully across the fl ats of the hexagonal chuck, this
indicates that the chuck is worn out and must be
replaced.
Carburettor (Fig. 9)
On delivery the carburettor is adjusted and locked
so it meets EPA's exhaust-gas standard.
The carburettor nozzle does not normally need to
be adjusted.
Normal setting:
Main nozzle (1)
................................
Idling nozzle (2) ........................ 2,0 turns open
When loaded, the maximum revs should be
2500-2650 rpm. The idling revs should be
1600-1800 rpm.
8 8
2,0 turns open
Fault fi nding
If the engine does not start, is diffi cult to start,
runs unevenly or has poor output, check the points
mentioned below.
1. Check that the Stop button (Fig. 8) is in ON
position.
2. Check the fuel level.
3. Check the spark plug's electrode distance.
4. Check that the air fi lter is not blocked.
5. Check that the fuel fi lter (U) is not blocked
(Fig. 2)
If the machine still does not work satisfactorily
following this procedure, please contact your
nearest authorised Atlas Copco workshop.
Scrapping worn-out machines
Worn-out machines must be dealt with and
deposited in such a way that the maximum amount
of material can be recycled and the environment is
affected as little as possible.
NB: Before a motor-driven drill is deposited it must
be emptied and cleaned of petrol.
Remaining petrol must be dealt with in such a way
as not to affect the environment.