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TROUBLE SHOOTING
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
output, low
discharge
pressure
Leaks in air lines, air valves,
Clean or replace as necessary.
Replace worn components as
necessary.
Drive belts slipping. Tension V-belts.
Drain valve left open. Close drain valve.
Defective pressure gauge. Replace pressure gauge.
Leaking head gasket. Replace head gasket.
Dirty or plugged inter cooler
tubes.
Remove and clean inter cooler
tubes.
Unloader pilot adjusted too
low, or defective.
Make necessary adjustments.
Worn or defective compressor
valves.
Replace valves.
Worn piston, worn out rings. Replace worn parts.
Restrictive check valve. Clean check valve and replace
if necessary.
Compressor incorrectly sized. Upgrade to larger compressor.
Engine stalls. Faulty unloader / check valve.
Low oil in engine
Replace unloader check valve.
Add oil to engine
Compressor not level. Level compressor.
Water in
crankcase
oil gets dirty,
rusty valves
or cylinders
Cycle too short; compressor
does not operate long enough
to vaporize condensed mois-
ture during compression.
Allow for longer operating
cycle.
Compressor operating out-
side in cold conditions or inlet
weather.
Provide adequate protec-
tion against extreme weather
conditions.