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Insufficient
Output
Low
Discharge
Pressure
Motor Stalls
Water In
Crankcase
Oil
Breaking
Up
Oil Gets
Dirty,Rusty
Valves or
Cylinders
• Clogged inlet filter
• Leaks in air lines,air valves,
fittings etc,..
• Drive belts slipping
•Drain valve left open
• Defective pressure gauge
• Compressor incorrectly sized
• Leaking head gasket
• Dirty or plugged inter cooler
tubes
• Unloader pilot or pressure
switch adjusted too low, or
defective
• Worn or defective
compressor valves
• Worn piston,worn out rings
• Restrictive check valve
• Faulty unloader/check valve
• Valves incorrectly installed
• Drive belts too tight
• Cycle too short; compressor
does not operate long
enough to vaporize
condensed moisture during
compression
• Compressor operating
outside in cold conditions or
inlet filter not protected
against weather
• System pressure leaking
back through check valve
when compressor is stopped
• Wrong oil being used
• Clean or replace as
necessary
• Replace worn components
as necessary
• Tension V-Belts
• Close drain valve
• Replace pressure gauge
• Replace head gasket
• Remove and clean inter
cooler tubes
• Make necessary
adjustments
• Replace worn parts
• Replace worn parts
• Clean check valve and
replace if necessary
• Replace unloader or check
valve
• Install valves correctly
• Tension V-belts
• Allow for a longer
operating cycle
•Provide adequate
protection against extreme
weather conditions
• Check and replace/check
valve if necessary
• Drain and replace with
proper oil
TROUBLE SHOOTING
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
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