Instruction Manual
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6
Problem solving
It is assumed that the engine is in good condition and that there is adequate fuel flow to the filter and injection
equipment.
Make sure that the wires are not damaged and that they are clamped tight to their terminals.
For denomination of switches, relays, etc., see
2.5 Electric system
.
See also section
3.3.1 Control panel
.
Problem: Compressor capacity or pressure below normal.
An electrical fault must be traced by an electrician.
Possible faults
Corrective actions
Air consumption exceeds capacity of compressor.
Check equipment connected.
Choked air filter elements (AF).
Remove and inspect elements. Clean or replace, if
necessary.
Regulating valve (RV) defective.
Have regulating valve removed and inspected by an
Atlas Copco Service representative.
Blow down valve stuck in open position.
Check and correct as necessary.
Loading valve (LV) leaking past O-ring.
With compressor running at max. load speed,
disconnect hose leading to unloader. If air leaks from
the hose, remove and inspect loading valve. Replace
damaged or worn O-rings.
Oil separator element clogged.
Have element removed and inspected by an Atlas
Copco Service representative.
Air intake throttle valve remains partially closed.
Remove air filters, air intake manifold and throttle
valve spring seat. Withdraw the valve and inspect.
Replace parts where necessary. Caution: the spring seat
is fixed with 4 short and 2 long setscrews: first remove
the short screws, then release the spring tension
unscrewing the long ones.
Safety valve (SV) leaking.
Remove and inspect. Replace if not airtight after
reinstallation.
Blow-off valve leaking.
Remove and inspect. Replace if necessary.