21
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
Large quantity of
oil in the discharge
air
NOTE: In an
oil lubricated
compressor there
will always be a
small amount of oil
in the air stream.
1. Worn piston rings.
1. Replace with new rings. Maintain oil level and
change oil more frequently.
2. Compressor air intake
restricted.
2. Clean or replace filter. Check for other
restrictions in the intake system.
3. Excessive oil in
compressor.
3. Drain down to full level.
4. Wrong oil viscosity.
4. Use Mobil 1
®
10W-30 or full synthetic.
Water in discharge
air / tank.
Normal operation. The
amount of water increases
with humid weather.
1. Drain tank more often. At least daily.
2. Add a filter to reduce the amount of water in the
air line.
Motor hums and
runs slowly or not
at all.
1. Low voltage.
1. Check incoming voltage. It should be
approximately 230 volts. Motor will not run
properly on 208 volts. Low voltage could be due
to wires (from electrical source to compressor)
being too small in diameter and / or too long.
Have a qualified electrician check these
conditions and make repairs as needed.
2. Too many devices on
same circuit.
2. Limit the circuit to the use of compressor only.
3. Loose electrical
connections.
3. Check all electrical connections.
4. Malfunctioning pressure
switch - contacts will not
close.
4. Replace pressure switch.
5. Malfunctioning check
valve.
5. Replace check valve.
Risk of Explosion.
Do not
disassemble check valve with air
pressure in tank.
DANGER
6. Defective unloader valve
on pressure switch.
6. Replace unloader valve.
7. Defective motor
capacitor(s).
7. Replace capacitor(s).
8. Defective motor.
8. Replace motor.
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