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Idiomas disponibles
TROUBLESHOOTING CHART (CONTINUED)
SYMPTOM
POSSIBLE CAUSE(S)
Motor hums and runs
1. Use of extension cord
slowly or not at all
2. Malfunctioning check valve or unloader
valve
3. Low voltage
4. Malfunctioning pressure switch - contacts
will not close
Reset mechanism cuts out
1. Too many devices on same circuit
repeatedly or fuses blow
repeatedly
2. Incorrect fuse size or circuit breaker
3. Malfunctioning check valve
4. Pressure switch set too high
5. Loose wiring
6. Malfunctioning motor
Tank does not hold
1. Worn check valve
pressure when
compressors off and the
shut off valve is closed
2. Check all connections and fittings for leaks
3. Check tank for cracks or pin holes
Pressure switch
1. Malfunctioning check valve
continuously blows air
out the unloader valve
Pressure switch does not
1. Malfunctioning unloader valve on
release air when the unit
pressure switch
shuts off
Black stain on oil sight
1. Too long of an interval between oil
glass (if pump was
changes
supplied with sight glass)
2. Wrong type of oil
Excessive vibration
1. Loose fasteners
2. Belt needs replaced
3. Belt alignment
CORRECTIVE ACTION
1. Do not use an extension cord. Use longer air hose
with larger diameter.
2. Replace check valve, unloader valve or pressure
switch.
Do not disassemble check
valve with air pressure in tank.
3. Check with voltmeter, check reset switch on motor.
If reset switch trips repeatedly, find and correct the
cause. See next item.
4. Repair or replace pressure switch.
1. Limit the circuit to the use of only the air
compressor.
2. Be sure that fuses or circuit breakers are rated
properly.
3. Replace check valve.
Do not disassemble check
valve with air pressure in tank.
4. Adjust or replace.
5. Check all electrical connections.
6. Replace motor.
1. Replace check valve.
Do not disassemble check
valve with air pressure in tank.
2. Tighten.
3. Replace tank. Never repair a damaged tank.
1. Replace the check valve if the unloader valve bleeds
off constantly.
Do not disassemble check
valve with air pressure in tank.
1. Replace the pressure switch if it does not release the
pressure for a short period.
Do not disassemble check
valve with air pressure in tank.
1. Drain oil. Remove sight glass and clean. Refill with
new oil.
2. Refer to lubrication section for proper oil
specifications.
1. Tighten.
2. Replace with correct size.
3. Align flywhell and pulley.
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