Troubleshooting Tips for Belt Driven Units

Excessive current draw trips circuit breaker of motor reset switch

1. Low voltage/motor overload
   
   
   
   
   
2. Drive belt too tight
3. Restricted air passages
   

1. Check that power supply is adequate and that compressor is on a dedicated circuit. If using extension cord, try using without. If compressor is connected to a circuit protected by a fuse, use dual element time delay fuses (Buss Fusetron type “T” only).
2. Readjust belt tension
3. Inspect and replace transfer tubes or check valve, as required

Compressor stalls

1. Low voltage motor
2. Bad check valve
3. Seized pump

1. Furnish adequate power
2. Replace the check valve.
3. Contact authorized service center.

Low discharge pressure

1. Air leaks
   
   
2. Leaking valves
3. Restricted air intake
   
4. Blown gaskets
   
5. Worn piston rings or cylinder
   

1. Tighten or replace leaking fittings or connections. Do not overtighten.
2. Contact authorized service center.
3. Clean or replace air filter element(s).
4. Contact authorized service center.
5. Contact authorized service center.

1. Loose engine pulley or compressor flywheel
2. Low oil level in pump crankcase
3. Excess carbon on valves or top of piston

1. Retighten pulley and flywheel. Check alignment.
2. Keep oil at proper level at all times.
3. Contact authorized service center.

Oil in discharge air

1. Worn piston rings or cylinder
2. Restricted air intake
3. Oil level too high

1. Contact authorized service center.
2. Clean or replace the air filter element(s).
3. Reduce to proper level.

Overheating

1. Poor ventilation
2. Dirty cooling surfaces
3. Restricted air passages

1. Relocate compressor to an area with cool, dry, well circulated air, at least 12 in. from nearest wall.
2. Clean all cooling surfaces thoroughly
3. Replace transfer tubes and/or unloader

1. Pulley out of alignment
2. Improper belt tension
3. Pulley wobbles

1. Realign pulley with compressor flywheel.
2. Readjust.
3. Replace the pulley and check for a damaged crankshaft or flywheel.

Compressor won’t start in cold temperatures

1. Too much back pressure in tank
2. 40W oil in crankcase
3. Compressor too cold

1. Open petcock when starting motor.
2. Use SAE 10W-30 synthetic oil.
3. Move compressor to a warmer location.