TROUBLESHOOTING
PROBLEM CAUSE REMEDY
Leaks in air system
Replace worn parts as necessary
Worn or loose drive belts
Tighten or replace belts as
necessary.
Pilot valve or pressure switch
differential adjusted too close
Have adjustments made by
authorized service location
Compressor valves not operating
properly
Replace valves
Compressor Loads/Unloads or
Starts/Stops excessively
Compressor too small for
application
Use compressor with higher air
output ratings
Clogged inlet filter
Clean or replace as necessary
Leaks in air lines, valves, or fittings
Replaces parts as necessary
Drive belts slipping
Tension belts
Drain valve left open
Close drain valve
Broken pressure gauge
Replace pressure gauge
Leaking head gasket
Replace head gasket
Dirty or plugged intercooler tubes
Remove and clean tubes
Unloader pilot or pressure switch
adjusted too low, or inoperative
Make necessary adjustments, or
replace
Worn or broken compressor valves
Replace worn parts
Worn piston or rings
Replace worn parts
Insufficient output - low
discharge pressure
Restrictive check valve
Clean check valve and replace if
necessary
Faulty unloader/check valve
Replace valve
Valves incorrectly installed Install
valves
correctly
Motor stalls
Drive belts too tight
Adjust belt tension
Cycle too short to vaporize moisture
during compression
Allow for a longer operating cycle
Compressor operating in cold
conditions - inlet filter not protected
against weather
Provide adequate protection
against extreme weather
conditions.
System pressure leaking back
through check valve
Check and replace check valve if
necessary
Water in crankcase oil - Oil gets
dirty, valves or cylinders get
rusty.
Wrong oil being used
Drain oil and replace with proper
oil
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