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20 200-2888
Note: Troubleshooting problems may have similar causes and solutions.
TROUBLESHOOTING CHART
PROBLEM POSSIBLE CAUSE SOLUTION
Excessive current draw
trips circuit breaker of
motor reset switch
Low voltage/motor overload 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 circut protected by a fuse, use dual
element time delay fuses (Buss Fusetron type “T” only).
Drive belt too tight Readjust belt tension
Restricted air passages Inspect and replace transfer tubes or check valve, as required.
Compressor stalls Low voltage motor Furnish adequate power.
Bad check valve Replace the check valve.
Seized pump Contact authorized service center.
Low discharge pressure Air leaks Tighten or replace leaking fittings or connections. Do not
overtighten.
Leaking valves Contact authorized service center.
Restricted air intake Clean or replace air filter element(s).
Blown gaskets Contact authorized service center.
Worn piston rings or cylinder Contact authorized service center.
Compressor pump
knocking
Loose engine pulley or
compressor 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 authorized service center.
Oil in discharge air Worn piston rings or cylinder Contact authorized 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 Replace transfer tubes and/or unloader.
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 synthetic blend, non-detergent air compressor oil.
Compressor too cold Move compressor to a warmer location.
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