9
200-2966
Note: Troubleshooting problems may have similar causes and solutions.
TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE
SOLUTION
Excessive current draw
trips circuit breaker or
motor reset switch
Low voltage/motor overload
Check that power supply is adequate and that compressor is on a
dedicated circuit.
Drive belt tension too tight
Readjust belt tension.
Restricted air passages
Inspect and replace transfer tubes or the check valve, (see “To replace
or clean check valve” in the maintenance section).
Compressor stalls
Low voltage to motor
Furnish adequate power.
Bad check valve
Replace the check valve (see “To replace or clean check valve” in the
maintenance section).
Seized pump
Contact a qualified service center.
Low discharge pressure
Air leaks
Tighten or replace leaking fittings or connections. Do not overtighten.
Leaking valves
Contact a qualified service center.
Restricted air intake
Clean or replace air filter element(s).
Blown gaskets
Contact a qualified service center.
Worn piston rings or cylinder
Contact a qualified service center.
Compressor pump
knocking
Loose motor pulley or pump
flywheel
Retighten pulley and flywheel. Check alignment.
Low oil level in pump crankcase Keep oil at proper level at all times.
Excess carbon on valves or top
of piston
Contact a qualified service center.
Oil in discharge air
Worn piston rings or cylinder
Contact a qualified service center.
Restricted air intake
Clean or replace the air filter element(s).
Oil level too high
Reduce to proper level.
Overheating
Poor ventilation
Relocate compressor to an area with cool, dry, well circulated air, at
least 12 in. from nearest wall.
Dirty cooling surfaces
Clean all cooling surfaces thoroughly.
Restricted air passages
Inspect and replace transfer tubes or the check valve, (see “To replace
or clean check valve” in the maintenance section).
Excessive belt wear
Pulley out of alignment
Realign pulley with compressor flywheel.
Improper belt tension
Readjust.
Pulley wobbles
Replace the pulley and check for a damaged crankshaft or flywheel.
Compressor won’t start in
cold temperatures
Too much back pressure in tank Open petcock when starting motor.
40W oil in crankcase
Use full synthetic, non-detergent air compressor oil.
Compressor too cold
Move compressor to a warmer location.
Air leaking through
bleeder valve after
compressor shuts off
Dirty or defective check valve.
Replace or clean the check valve (see “To replace or clean check
valve” in the maintenance section).
