Atlas Copco XAS 185 CD7 T4, Instruction Manual, Page: 35 / 40

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Problem Possible Faults Corrective Action
14. Excessive compressor oil consumption. Oil
mist being discharged from air outlet valve (5-
fig. 4.2).
a. Restrictor in oil scavenging line 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.
15. 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 17.
c. Check engine lubricating system.
d. Check engine cooling; see engine operation manual
16. Air and oil expelled from air filter after
stopping.
a.Unloader valve defective,
b. Wrong oil type with no foam-retarding additives.
a. Repair valve.
b. Consult Atlas Copco.
17. Compressor overheating. 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.
a. Relocate compressor for adequate ventilation.
b. Clean cooler; see section Storage.
c. Consult Atlas Copco.
d. See section Cleaning Coolers.
e. Replace fan.
f. Replace oil separator.
g. Replace oil filter.