31
Instruction Manual
Problem Possible faults Corrective actions
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 4.6.
c. Consult Atlas Copco.
d. See section 4.4.
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