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Oilless Compressors
Troubleshooting Chart
Symptom
Compressor will not run
Motor hums but cannot
run or runs slowly
Fuses blow/circuit
breaker trips repeatedly
CAUTION
!
Never use an extension
cord with this product
Thermal overload
protector cuts out
repeatedly
Knocks, rattles,
excessive vibration
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Possible Cause(s)
1. No electrical power
2. Blown fuse
3. Breaker open
4. Thermal overload open
5. Pressure switch bad
6. Check valve defective
1. Poor contacts, line voltage incorrect
2. Shorted or open motor winding
3. Defective check valve or unloader
1. Incorrect size fuse, circuit overloaded
2. Defective check valve or unloader
1. Low voltage
2. Clogged air filter
3. Lack of proper ventilation/room
temperature too high
4. Check valve malfunction
1. Leaking, broken, or loose valves or
restricted air passage
2. Defective pressure switch unloader
3. Defective bearing on eccentric or
motor shaft
4. Cylinder or piston ring is worn or
scored
5. Loose bolts, tank not level
Corrective Action
1. Plugged in? Check fuse/breaker or motor overload
2. Replace blown fuse
3. Reset, determine cause of problem
4. Motor will restart when cool
5. Replace
6. Remove and replace check valve
DANGER
!
1. Check connections, check with voltmeter
2. Replace motor
3. Replace or repair
DANGER
!
1. Check for proper fuse, use time-delay fuse.
Disconnect other electrical appliances from circuit or
operate compressor on its own branch circuit
2. Replace or repair
DANGER
!
1. Check with voltmeter
2. Clean filter (see Maintenance section)
3. Move compressor to well ventilated area
4. Replace
DANGER
!
1. Replace
2. Replace or repair as necessary
3. Replace
4. Replace or repair as necessary
5. Tighten bolts, shim tank to level position
6
Do not disassemble check valve
with air in tank; bleed tank
Do not disassemble check valve
with air in tank; bleed tank
Do not disassemble check valve
with air in tank; bleed tank
Do not disassemble check valve
with air in tank; bleed tank
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