Instruction manual
TROUBLE SHOOTING
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Will not start
• Incorrect power supply and/or
wiring
• Air receiver is at full pressure
• Make sure power is turned on
• Consult with a licensed
electrician
• Drain air receiver
Low pressure
• Safety valve leaks
• Drain cock open
• Loose tubes or fittings
• Dirty or plugged air filter
• Defective unloader valve
• Replace safety valve
• Close drain cock
• Tighten fittings
• Clean or replace as necessary
• Replace unloader valve
Oil in discharge
• Improper oil viscosity
• Too much oil in the crankcase
• Compressor overheated
• Restricted air filter
• Worn piston rings
• Drain and replace oil
• Drain oil and fill to proper level
• Air pressure regulated too high
• Clean or replace air filter
• Replace piston rings
Compressor
overheats
• Clogged inlet filter
• Dirty compressor, head,
cylinder or intercooler
• Operating pressure too high
• Low oil or wrong oil being used
• Compressor cycle too long,
proper cycle is 50-60% on
stop/start operation
• Leaks in air system
• Clean or replace as necessary
• Clean with compressed air
• Reduce operating pressure
• Drain and replace oil
• Allow for longer rest between
cycles
Compressor loads
and unloads or
stops and starts
excessively
• Pressure switch differential
adjusted too close
• Defective compressor valves
• Compressor too small for
intended use
• Replace worn components as
necessary
• Make necessary adjustments
• Replace valves
Insufficient output
• Clogged inlet filter • Clean or replace as necessary
Low discharge
pressure
• 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
• Pressure switch adjusted too
low, or defective
• Worn or defective compressor
valve
• Worn piston, worn out rings
• Restrictive check valve
• 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 valves
• Replace worn parts
• Clean check valve and replace
if necessary
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