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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 Electric system.
See also sectionControl 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.
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