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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.
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.
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