18
tROubLeshOOtING
Compressor
Problem
Possible Cause
Solutions
Compressor
stalls and dies
1. Drive engine low on fuel.
2. Compressor check valve not
functioning.
3. Compressor Pilot valve not
functioning.
4. Spark Plug in engine is bad.
5. Drive engine low on oil.
1. Check fuel level in drive engine.
2. Inspect compressor check
valve.
3. Check drive engine spark plug.
4. Check oil level on compressor
drive engine.
5. Check oil on compressor
pump.
Compressor
is running but
is not
compressing
air
1. Compressor pilot valve is
actuated.
2. Compressor pilot valve is
malfunctioning.
3. Compressor pump head
unloaders stuck engaged.
1. Check pilot valve to make sure
it is in the proper position.
2. Replace compressor pilot valve.
3. Check and clean compressor
pump head unloaders.
Compressor
does not idle
up for
compression
1. Throttle control valve (bullwhip)
not engaging.
2. Throttle control valve cable
broken.
3. Drive engine throttle
connection damaged.
1. Check throttle control valve
(bullwhip) for proper function.
2. Replace throttle control valve.
3. Check drive engine throttle
connection.
Compressor
pump knocking
1. Loose motor pulley or
compressor flywheel.
2. Low oil level in compressor
pump.
3. Carbon build up on valve and
piston.
1. Tighten pulley or flywheel.
2. Keep oil level at recommended
level for proper operation.
3. Only use factory recommended
oil.
Excessive oil
discharge in
air (All
Compressors
have a small
amount of oil
carry over in
compression)
1. Worn piston rings or cylinder.
2. Restricted air intake.
3. Oil level to high.
4. Compressor has exceeded
duty cycle.
1. Clean or replace air filters.
2. Reduce oil level to
recommended amount.
3. Reduce compressor duty cycle
(repair leaks or add another unit
to handle the excess demand).
Compressor
Overheating
1. Poor ventilation.
2. Dirty cooling surfaces.
3. Compressor is out of its
operating duty cycle.
1. Relocate compressor to any
area with better ventilation (at
least 18 inches from the
nearest wall).
2. Clean all cooling surfaces.
3. Reduce compressor duty cycle
(repair leaks or add another unit
to handle the excess demand).
Excessive belt
wear
1. Pulley out of alignment.
2. Improper belt tension.
3. Pulley damaged of loose.
1. Realign pulley with flywheel.
2. Readjust belt tension.
