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Problem: Air and oil mist expelles from air filters immediately after stopping.
Problem: Compressor overheating.
Possible faults Corrective actions
Check valve at element outlet. Remove and inspect. Replace if necessary. Replace air filter elements and
safety cartridges. Check the oil level and add oil if necessary. Run the
compressor for a few minutes, stop and recheck oil level.
Plunger of oil stop valve jammed. Remove and inspect. Replace if necessary. Replace air filter elements and
safety cartridges. Check the oil level and add oil if necessary. Run the
compressor for a few minutes, stop and recheck oil level.
Possible faults Corrective actions
Insufficient compressor cooling. Locate compressor away from walls; when banked with other compressors,
leave space between them.
Oil cooler clogged externally. Clean oil cooler. Refer to section Cleaning coolers.
Oil cooler clogged internally. Consult Atlas Copco.
Oil filters clogged. Replace oil filters.
Oil level too low. Check oil level. Top up with recommended oil if necessary.
Thermostatic by-pass valve remains stuck in opened
position.
Remove valve and check for proper opening and closing. Replace if out of
order.
Fan blade(s) broken. Check and correct if necessary.
Oil stop valve malfunctioning. Remove and inspect valve.
Oil separator element (OS) clogged. Have element removed and inspected by an Atlas Copco Service
representative.
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