9
11
trouble shooting
problem
possible Cause
CorreCtiVe aCtion
Will not start
Incorrect power supply and/or
wiring.
Make sure power is turned
on. (Consult with a licensed
electrician).
Air receiver is at full pressure. Drain air receiver.
Low pressure Safety valve leaks.
Replace safety valve.
Drain cock open.
Close drain cock.
Loose tubes or fittings.
Tighten fittings.
Dirty or plugged air filter.
Clean or replace as necessary.
Defective unloader valve.
Replace unloader valve.
Oil in
discharge
Too much oil in the crank-
case.
Drain oil and fill to proper level.
Improper oil viscosity.
drain and replace oil
Compressor overheated.
Air pressure regulated too
high.
Restricted air filter.
Clean or replace air filter.
Worn piston rings.
Replace piston rings.
Compressor
overheats
Dirty compressor head, cylin-
der or intercooler.
Clean with compressed air.
Clogged inlet filter.
Clean or replace as necessary.
Operating pressure too high.
Reduce operating pressure.
Low oil or wrong oil being
used.
Drain and replace oil.
Compressor cycle too long.
Proper cycle is 50-60% on
Stop/Start operation.
Allow for longer rest between
cycles.
Leaks in air system.
Check for leaks.
Compres-
sor loads &
unloads or
stops & starts
excessively
Pressure switch differential
adjusted too close.
Replace worn components as
necessary.
Make necessary adjustments.
Defective compressor valves. Replace valves.
Compressor too small for
intended use.
Upgrade to larger compressor.
