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Operating Instructions
Cast Iron Series
Troubleshooting Chart
Symptom
Water in discharge air/tank
Motor hums and runs slow-
ly or not at all
Reset mechanism cuts out
repeatedly or fuses blow
repeatedly
Tank does not hold pres-
sure when
compressors off and the
shut off valve is closed
Pressure switch
continuously blows air out
the unloader valve
Pressure switch does not
release air when the unit
shuts off
Excessive vibration
(Continued)
Possible Cause(s)
1. Normal operation. The
amount of water increases
with humid weather
1. Use of extension cord
2. Malfunctioning check valve
or unloader valve
3. Low voltage
4. Malfunctioning pressure
switch - contacts will not
close
1. Too many devices on same
circuit
2. Incorrect fuse size or circuit
breaker
3. Malfunctioning check valve
4. Pressure switch set too
high
5. Loose wiring
6. Malfunctioning motor
1. Worn check valve
2. Check all connections and
fittings for leaks
3. Check tank for cracks or
pin holes
1. Malfunctioning check valve
1. Malfunctioning unloader
valve on pressure switch
1. Loose fasteners
2. Belt needs replaced
3. Belt alignment
Corrective Action
1. Drain tank more often. At least daily.
2. Add a filter to reduce the amount of water in the air line.
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
DANGER
!
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
DANGER
!
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
DANGER
!
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
DANGER
!
air pressure in tank
1. Replace the pressure switch if it does not release the pressure
for a short period of time when the unit shuts off.
Do not disassemble pressure switch with
DANGER
!
air pressure in tank
1. Tighten.
2. Replace with correct size.
3. Align flywhell and pulley.
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