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09
Troubleshooting (Continued)
Possible Cause(s)
Excessive discharge pressure
Wrong oil being used
Loose flywheel, drive, pulley
Corrective Action
Reduce operating pressure
Drain and replace with proper oil
Tighten loose components
Problems
Compressor Uses Too Much Oil
Excessive Vibration (Continued)
Clogged inlet filter
Clean inlet filter or replace as
necessary
Wrong oil being used, wrong
viscosity
Drain and replace oil
Compressor Knocks
Piston Rings Not Seated
Worn connector rods, wrist pin,
or main bearings
Check and replace worn parts
Compressor valves loose or
broken
Check and replace worn or
broken valves
Check valve knocks at low
pressure
Remove and clean check valve
Oil level too high
Fill compressor with oil to
proper level
Crankcase breather valve
malfunction
Replace crankcase breather
Compressor runs unloaded too
long
Increase load or stop compressor
when not needed. Check for air
leaks
Compressor operating outside in
cold conditions or inlet not
protected against weather
Provide adequate protection
against extreme weather
conditions
Worn piston rings
Piston rings not seated
Replace piston rings
See below
Allow 100 hours of normal
operation for new rings to seat.
Drain oil and refill with the
recommended oils.