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Speedaire
®
Stationary Air
Compressors
Speedaire Operating Instructions
Manufactured for Dayton Electric Mfg. Co.
Niles, Illinois 60714 U.S.A.
Symptom
Possible Cause(s)
Corrective Action
Troubleshooting Chart (Continued)
Water in discharge air/tank
1. 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. Use of extension cord
2. Malfunctioning check valve or
unloader valve
3. Low voltage
4. Malfunctioning pressure
switch - contacts will not close
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.
Reset mechanism cuts out
repeatedly or fuses blow repeatedly
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. 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.
Tank does not hold pressure when
compressors off and the shut off
valve is closed
1. Worn check valve
2. Check all connections and
fittings for leaks
3. Check tank for cracks or pin
holes
1. Replace check valve.
Do not disassemble check valve with
air pressure in tank.
2. Tighten.
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 bleeds off
constantly.
Do not disassemble check valve with
air pressure in tank.
Pressure switch does not release air
when the unit shuts off
Malfunctioning unloader valve on
pressure switch
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 air pressure in tank.
Black stain on oil sight glass (if
pump was supplied with sight glass)
1. Too long of an interval
between oil changes
2. Wrong type of oil
1. Drain oil. Remove sight glass and clean. Refill with new oil.
2. Refer to lubrication section for proper oil specifications.
Excessive vibration
1. Loose fasteners
2. Belt needs replaced
3. Belt alignment
1. Tighten.
2. Replace with correct size.
3. Align flywhell and pulley.
