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11. Compressor capacity or pressure
below normal.
a. Air consumption exceeds capacity of compressor.
b. Choked air filter elements (AF).
c. Unloading valve (UV) not completely open.
d. Engine does not run at max. speed.
e. Oil separator element (OS) clogged.
a. Check equipment connected.
b. Replace air filter element (AF).
c. Speed regulation cable maladjusted; see section
Adjustment of the continuous pneumatic regulating
system.
d. Check the maximum speed, service the fuel filter.
e. Have element removed and inspected by an Atlas Copco
Service representative.
12. Working pressure rises during
operation and causes safety valve to
blow.
a. See faults 10.
b. Safety valve (SV) opens too soon.
a. See remedies 10.
b. Have safety valve adjusted; consult Atlas Copco.
13. Excessive compressor oil
consumption. Oil mist being
discharged from air outlet valve(s).
a. Restrictor in oil scavenging line (SL) clogged.
b. Oil separator element (OS) defective.
c. Oil level too high.
a. Dismount, clean and refit restrictor.
b. Replace element.
c. Check for overfilling. Release pressure and drain oil to
correct level.
14. Compressor shuts down through a
shutdown switch.
a. Alternator V-belt broken or slipping.
b. Compressor overheating.
c. Engine oil pressure too low.
d. Engine temperature too high.
a. Re-tense or replace V-belt.
b. See condition 16.
c. Check lubricating system.
d. Check engine oil system; see Engine Operation Manual.
15. Air and oil mist expelled from air filter
after stopping.
a. Unloader valve (UV) defective.
b. Wrong oil type (without foam-retarding additives).
a. Repair valve.
b. Consult Atlas Copco.
16. Compressor overheating. a. Insufficient compressor cooling.
b. Oil cooler (OC) clogged externally.
c. Oil system clogged internally.
d. Oil level too low.
a. Relocate compressor.
b. Clean cooler; see section Cleaning coolers.
c. Consult Atlas Copco.
d. See section Compressor oil level check.
Problem Possible faults Corrective actions
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