12
tROubLE ShOOtInG
PRObLEM
POSSIbLE CAuSE
CORRECtIvE ACtIOn
System pressure leaking back
through check valve when
compressor is stopped.
Check and replace check
valve if necessary.
Wrong oil being used.
Drain and replace with proper
oil
Excessive
vibration
Loose compressor, engine or
engine guard.
Tighten components.
Compressor not level.
Level compressor
Leg bolts over tightened to
floor.
Loosen leg bolts.
Excessive discharge pres-
sure.
Reduce operating pressure.
Wrong oil being used.
Drain and replace with proper
oil.
Loose flywheel, drive, pulley
or drive belts.
Tighten loose components and
check belts.
Worn connector rods, wrist
pin or main bearings.
Check and replace worn parts.
Compressor
Knocks
Compressor valves loose or
broken.
Check and replace worn or
broken valves..
Check valve knocks at low
pressure.
Remove and clean check
valve.
Compressor
uses too
much oil
Clogged inlet filter.
Clean inlet filter or replace as
necessary.
Wrong oil being used, wrong
viscosity.
Drain and replace oil.
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 compres-
sor when not needed. Check
for air leaks.
