Craftsman 919.724321 - Manuel (Page 21)

21- ENG A14411
TROUBLESHOOTING
Risk of Unsafe Operation. Unit cycles automatically when
power is on. When servicing, you may be exposed to
voltage sources, compressed air, or moving parts. Before servicing unit
unplug or disconnect electrical supply to the air compressor, bleed tank of
pressure, and allow the air compressor to cool.
PROBLEM CAUSE CORRECTION
Pressure switch does not
shut off motor when com-
pressor reaches "cut-out"
pressure.
Pressure switch "cut-out"
too high.
Move On/Auto/Off lever
to the "OFF" position, if
the outfit does not shut off
contact a Trained Service
Technician.
Contact a Trained Service
Technician.
Excessive tank
pressure - safety
valve pops off.
Tube fittings are not tight
enough. Tighten fittings where air can
be heard escaping. Check fit-
tings with soapy water solu-
tion.
Do Not Overtighten.
Air leaks at fit-
tings.
Air leaks at
pressure switch
release valve. Defective pressure switch
release valve. Contact a Trained Service
Technician.
Air leaks in air
tank or at air
tank welds. Defective air tank. Air tank must be replaced.
Do not repair the leak.
Risk of
Bursting.
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 valve plate. Leaking seal.
Air leaks at or
inside check
valve Check valve seat damaged. 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. Replace check
valve. Refer the "To Replace
or Clean Check Valve" in the
"Service and Adjustment"
section.
Contact a Trained Service
Technician.