Craftsman Air compressor - Troubleshooting Guide; Pressure and Leak Issues; Tank and Seal Leaks; Gauge and Noise Issues

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 TANK AIR PRESSURE.
PROBLEM CAUSE
Excessive tank pressure - safety
valve pops off.
Air leaks at fittings.
Pressure switch does not shut off mo-
tor when compressor reaches "cut-
out" pressure.
Pressure switch "cut-out" too high.
Tube fittings are not tight enough.
Air leaks at or inside check Defective or dirty check valve.
valve.
CORRECTION
Move the pressure switch lever to the "OFF" posi-
tion. If the outfit doesn't shut off, and the electrical
contacts are welded together, replace the pressure
switch.
Returnthe outfit to Sears Service Center to check and
adjust, or replace switch.
Tighten fittings where air can be heard escaping.
Check fittings with soapy water solution. DO NOT
OVER-TGHTEN.
A defective check valve results in a constant air leak
at the pressure release valve where there is pressure
in the tank and the compressor is shut off. Remove
and clean or replace check valve.
Remove and replace the release valve.Defective pressure switch release
valve.
Defective check valve.
Air leaks at pressure switch re-
lease valve.
Defective air tank.Air leaks in air tank or at air
tank welds.
If the 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.
Pressure reading on the regu-
lated pressure gauge drops when
an accessory is used.
A defective check valve results in a constant 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.
Air tank must be replaced. Do not repair the leak.
DO NOT DRILL INTO, WELD OR
OTHERWISE MODIFY AIR TANK
OR IT WILL WEAKEN. THE TANK
CAN RUPTURE OR EXPLODE.
Air leaks between head and Leaking seal. Torque head screws to 8 ft. lbs. If this does not stop
valve plate, leak, replace seal.
It is normal for "some" pressure drop
to occur.
If there is an excessive amount of pressure drop when
the accessory is used, adjust the regulator following
the instructions on page 6.
NOTE
Adjust the regulated pressure
under flow conditions (while accesory is
being used).
Air leak from safety valve. Possible defect in safety valve. Operate safety valve manually by pulling on ring.
If valve still leaks, it should be replaced.
Knocking Noise Defective check valve. Remove and clean, or replace.
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