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TROUBLESHOOTING GUIDE
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 CAUSE CORRECTION
Excessive tank pressure - safety valve
pops off.
Air leaks at fittings.
Defective or dirty check valve.
Air leaks continously at pressure switch
release valve.
Air leaks in air tank or at air tank welds.
Air leak from safety valve.
Knocking noise.
Pressure switch does not shut off motor
when compressor reaches “cut-out” pres-
sure.
Pressure switch “cut-out” too high.
Tube fittings are not tight enough.
Air leaks at or inside 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 compressor mounting screws.
Loose belt.
Carbon build-up.
Belt too tight.
Move the pressure switch lever to the “OFF”
position. If the outfit doesn’t shut off, and
the electrical contacts are welded to-
gether, replace the pressure switch.
Return the outfit to an Authorized Warranty
Service Center to check, remove or re-
place switch.
Tighten fittings where air can be heard
escaping. Check fittings with soapy water
solution. DO NOT OVER-TIGHTEN.
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. (See page 11)
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. (See page 11)
Air tank must be replaced. Do not repair the
leak.
DO NOT DRILL INTO, WELD OR OTH-
ERWISE MODIFY AIR TANK OR IT
WILL WEAKEN. THE TANK CAN RUP-
TURE OR EXPLODE.
Operate safety valve manually by pulling on
ring. If valve still leaks, it must be replaced
with a valve of the same rating.
Remove and clean or replace.
Tighten pulley set screw, 70-80 in.-lbs.
Maintain prescribed oil level. Add oil.
Tighten screw 15-20 ft. lbs.
Check screws. Tighten as required. (15-20
ft.-lbs.)
See "Adjusting Belt Tension" on page 12.
Remove the head and valve plate. Clean
the valve plate and top of the piston. (Be
sure carbon does not fall into the cylinder.)
Reassemble to 25-30 ft. lbs. using new
gasket and torque screws.
Adjust belt tension (See page 12).