Atlas Copco XAS 185 CDU T4 Original Instructions Manual page 41

Problem
14. Excessive compressor oil consumption. Oil mist
being discharged from air outlet valve.
15. Compressor shuts down through a shut-down switch.
16. Air and oil expelled from air filter after stopping.
17. Compressor overheating.
Possible faults
a.Restrictor in oil scavenging line clogged,
b.Oil separator element (OS) defective.
c.Oil level too high.
a.Alternator V-belt broken or slipping,
b.Compressor overheating.
c.Engine oil pressure too low.
d.Engine temperature too high
a.Unloader valve defective,
b.Wrong oil type with no foam-retarding additives.
a.Insufficient compressor cooling,
b.Oil cooler (OC) clogged externally.
c.Oil system clogged internally.
d.Oil level too low.
e.Cooling fan (F) defective.
f.Oil separator element clogged.
g.Oil filter clogged.
h.Broken fan belt.
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Corrective actions
a.Dismount, clean and refit restrictor;
b.Replace element.
c.Check for overfilling. Release pressure and drain
oil to correct level.
a.Re-tense or replace V-belt.
b.See condition 17.
c.Check engine lubricating system.
d.Check engine cooling; see engine operation manual
a.Repair valve.
b.Consult Atlas Copco.
a.Relocate compressor for adequate ventilation.
b.Clean cooler; see Safety Precautions.
c.Consult Atlas Copco.
d.See Service Kits.
e.Replace fan.
f.Replace oil separator.
g.Replace oil filter.
h.Replace.