Troubleshooting guide

17
PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS OR COMPRESSED AIR SOURCES.
PERSONAL INJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY REPAIRS, UNPLUG THE COMPRESSOR AND BLEED OFF
ALL TANK AIR PRESSURE.
PROBLEM
Excessive tank pressure - safety valve
pops off.
Air leaks at fittings.
Air leaks at or inside check valve.
Air leaks at pressure switch
release valve.
Air leaks in air tank or at air tank welds.
Air leak from safety valve.
Knocking noise
CAUSE
Pressure switch does not shut off motor
when air compressor reaches “cut-out”
pressure.
Pressure switch “cut-out” too high.
Tube or hose fittings are not tight
enough.
Defective or dirty check valve.
Defective pressure switch release valve.
Defective check valve.
Defective air tank.
Possible defect in safety valve.
Restricted or defective check valve.
Loose pulley.
Low oil level.
Loose flywheel.
Loose pump or motor mounting bolts.
CORRECTION
Move the pressure switch "OFF/ON-
AUTO" lever to the “OFF” position. If the
air compressor doesn’t shut off, replace
the pressure switch.
If the pressure switch contacts are good,
check to see if the pin in the bottom of the
pressure release valve is stuck. If it does
not move freely, replace the valve.
Return the unit to an Authorized War-
ranty Service Center to check, remove or
replace pressure switch.
Tighten fittings where air can be heard
escaping. Check fittings with soapy wa-
ter solution. DO NOT OVER-TIGHTEN.
If leak persist, remove fittings and rein-
stall with thread sealant.
A defective check valve results in a con-
stant air leak at the pressure release
valve when there is pressure in the tank
and the compressor is shut off. Remove
and clean or replace check valve. DO
NOT OVER-TIGHTEN.
Remove and replace the release valve.
A defective check valve results in a con-
stant air leak at the pressure release
valve when there is pressure in the tank
and the compressor is shut off. Remove
and clean or replace check valve. DO
NOT OVER-TIGHTEN.
Air tank must be replaced. Do not at-
tempt repair of any leaks.
DO NOT DRILL INTO, WELD OR
OTHERWISE MODIFY AIR TANK
OR IT WILL WEAKEN. THE TANK
CAN RUPTURE OR EXPLODE.
Operate safety valve manually by pull-
ing on ring. If valve still leaks, it must be
replaced.
Remove and clean or replace check
valve.
Retighten pulley set screw.
Maintain prescribed oil level. Add oil.
Torque bolt 15-20 ft.-lbs.
Check bolts. Torque as required (15-20
ft.-lbs.)
TROUBLESHOOTING GUIDE