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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.
An electrical fault must be traced by an
electrician.
Problem: Compressor capacity or pressure below normal.
Possible faults
Air consumption exceeds capacity of compressor.
Choked air filter elements (AF).
Regulating valve (RV) defective.
Blow down valve stuck in open position.
Loading valve (LV) leaking past O-ring.
Oil separator element clogged.
Air intake throttle valve remains partially closed.
Safety valve (SV) leaking.
Blow-off valve leaking.
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.
Corrective actions
Check equipment connected.
Remove and inspect elements. Clean or replace, if necessary.
Have regulating valve removed and inspected by an Atlas Copco Service representative.
Check and correct as necessary.
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.
Have element removed and inspected by an Atlas Copco Service representative.
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.
Remove and inspect. Replace if not airtight after reinstallation.
Remove and inspect. Replace if necessary.
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