39TROUBLESHOOTING
6.13 COMPRESSOR OIL LEAKING IN CONTROL LINES/ORIFICES
POSSIBLE CAUSE ACTION
Compressor oil level in sump tank too full Check and adjust compressor oil as needed.
Oil return line (scavenger tube) plugged or restricted Remove the oil return line and clean.
Separator element plugged or damaged Replace the separator element and change compressor
oil.
High compressor discharge temperature Check the compressor oil level; add oil as needed.
Clean the oil cooler.
Check the fan belt. Adjust or replace as needed.
Check thermal bypass valve (compressor oil thermostat).
Clean the oil cooler internally.
Discharge pressure below 90 psi The air demand may be too much. Add compressors or
decrease the demand.
Adjust the discharge pressure above 90 psi.
Check MPV operation, rebuild/replace as needed.
Diaphragm in recirculation valve ruptured Inspect the diaphragm, rebuild/replace as needed.
Condensation in sump tank Drain condensation from sump tank.
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