Instruction Manual
2954 2510 03 87
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 3.4.1 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.
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