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TROUBLE SHOOTING CHART FOR COMPRESSOR
Always disconnect unit from power supply and relieve all pressure from air tank before performing
any maintenance. "Tag Out" or "Lock Out" all power sources. Failure to do so may result in
equipment damage or injury.
Never operate unit without belt guard in place.
Never use gasoline or flammable solvent on or around compressor unit. Explosion may result.
Symptom
Motor will not start.
Starter trips repeatedly.
Tank pressure builds up slowly.
Tank pressure builds up quickly.
Discharge pressure relief valve pops
off while compressor is running.
Compressor will not unload
Excessive belt wear.
Compressor runs hot.
Interstage pressure relief valve pops off.
Excessive oil consumption.
Troubleshooting Chart
Possible Cause(s)
1.
Main switch and fuses open.
2.
Starter heater coils open.
3.
Starter tripped
4.
Defective pressure switch-
contacts will not close
5.
Low voltage.
1.
Improperly adjusted pressure switch.
2.
Faulty check valve.
3.
Incorrect fuse size or magnetic starter
heaters.
4.
Low voltage.
5.
Defective motor.
1.
Air leaks.
2.
Dirty air filter.
3.
Defective compressor valves
1.
Excessive water in tank.
1.
Wrong pressure switch setting.
2.
Defective ASME relief valve.
1.
Wrong pilot valve setting.
2.
Defective pilot valve.
3.
Lack of air to pilot valve..
1.
Pulley out of alignment.
2.
Belts too tight or too loose.
1.
Improper flywheel rotation
2.
Defective compressor valves.
3.
Dirty air filter.
4.
Dirty cylinder and/or intercooler.
1.
Defective compressor valves.
1.
Dirty air filter.
2.
Wrong oil viscosity.
3.
Oil leaks.
4.
Worn piston rings.
5.
Scored cylinder
18
Corrective Action
1.
Check all fuses and switches. Check
for loose or faulty wires.
2.
Check overload relay in starter.
Reset starter.
3.
Reset starter. If starter trips
repeatedly, have electrical system
inspected by an electrician.
4.
Repair or replace pressure switch.
Warning – Relieve tank pressure
before servicing.
5.
Check with voltmeter. Be sure
voltage corresponds to unit
specifications.
1.
Adjust or replace.
Warning – Relieve tank pressure
before servicing.
2.
Clean or replace
Warning – Relieve tank pressure
before servicing.
3.
Be sure that fuses and heaters are
properly rated.
4.
Check with voltmeter. Be sure
voltage corresponds to unit
specifications.
5.
Replace motor.
1.
Tighten fittings.
2.
Clean or replace.
3.
Install new valve plate assembly.
1.
Drain tank.
1.
Adjust to correct setting.
2.
Replace valve.
Warning – Relieve tank pressure
before servicing.
1.
Adjust to correct stting
2.
Replace pilot valve.
3.
Open needle valve to pilot valve.
1.
Realign motor pulley.
2.
Adjust belt tension.
1.
Check for correct rotation.
(Counter clockwise when viewed
from drive side.)
2.
Install new valve plate assembly.
3.
Clean or replace.
4.
Clean cylinder fins and/or intercooler.
1.
Install new valves.
1.
Clean or replace.
2.
Refill with proper viscosity oil.
3.
Tighten bolts. Replace gaskets.
4.
Replace rings.
5.
Replace cylinder.
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