Porter-Cable C7550 - Manual (Page 22)

22-ENG D27042
TROUBLESHOOTING
Performing repairs may expose voltage sources, moving
parts or compressed air sources. Personal injury may
occur. Prior to attempting any repairs, unplug the air compressor and
bleed off all air tank air pressure.
PROBLEM CAUSE CORRECTION
Pressure switch does not
shut off motor when
compressor reaches "cut-
out" pressure.
Pressure switch "cut-out"
too high.
Move On/Auto/Off lever to
the "Off" position, if the unit
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
fittings with soapy water
solution. DO NOT OVER
TIGHTEN. Air leaks at
fittings.
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.
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. Contact a Trained Service
Technician.
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 Adjustments"
section.