TROUBLESHOOTING GUIDE (CONTINUED)
MAINTENANCE /
REP
AIR
TROUBLESHOOTING
OPERA
TION
ASSEMBL
Y /
INST
ALLA
TION
SAFETY
/
SPECIFICA
TIONS
GETTING ST
ARTED
13
SYMPTOM
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
Motor hums and runs slowly or
not at all (Continued)
7. Defective unloader valve on pressure
switch
7. Replace unloader valve.
8. Defective motor capacitor(s)
8. Replace capacitor(s).
9. Defective motor
9. Replace motor.
Reset mechanism cuts out
repeatedly or circuit breaker trips
repeatedly
1. Lack of proper
ventilation / room temperature too high
1. Move compressor to well-ventilated area.
2. Too many devices on same circuit
2. Limit the circuit to the use of only the air compressor.
3. Restricted air intake
3. Clean or replace filter element.
4. Loose electrical connection
4. Check all electrical connections.
5. Pressure switch shut-off pressure set
too high
5. Replace pressure switch.
6. Malfunctioning check valve
6. Replace check valve.
Risk of Explosion. Do not
disassemble check valve
with air pressure in tank.
7. Defective unloader valve on pressure
switch
7. Replace unloader valve.
8. Defective motor capacitor(s)
8.Replace capacitor(s).
9. Malfunctioning motor
9. Replace motor.
Tank does not hold pressure
when compressor is off and the
shut off valve is closed
1. Air leaks (fittings, tubing on compressor,
or plumbing outside system)
1. Check all connections with soap and water solution.
Tighten; or remove and apply sealant to threads, then
reassemble.
2. Worn check valve
2. Replace check valve.
Risk of Explosion. Do not
disassemble check valve
with air pressure in tank.
3. Check tank for cracks or pin holes
3. Replace tank. Never repair a damaged tank.
Pressure switch continuously
blows air out the unloader valve
Malfunctioning check valve
Replace the check valve if the unloader valve on the
pressure switch bleeds off constantly when unit shuts off.
Risk of Explosion. Do not
disassemble check valve
with air pressure in tank.
Excessive vibration
1. Loose fasteners on pump or motor
1. Tighten fasteners.
2. Belt needs replaced
2. Replace with correct size.
3. Belt alignment
3. Align flywheel and pulley.
Pressure switch does not
release air when the unit shuts
off
Malfunctioning unloader valve on pressure
switch
Replace the unloader valve if it does not release the
pressure for a short period of time when the unit shuts off.
Risk of Explosion. Do not
disassemble unloader
valve with air pressure in tank.
