Troubleshooting - Porter-Cable C7501M Instruction Manual

Risk of Unsafe Operation. Unit cycles automatically when
power is on. When servicing, you may be exposed to voltage sources, com-
pressed air, or moving parts. Before servicing unit unplug or disconnect elec-
trical supply to the air compressor, bleed tank of pressure, and allow the air
compressor to cool.
PROBLEM
Excessive Pressure switch does
tank pressure not shut off motor when
- safety valve compressor reaches
pops off "cut-out" pressure.
Pressure switch "cut-
out" too high.
Air leaks at Tube fittings are not
fittings tight enough.
Air leaks at Check valve seat
or inside damaged.
check valve
Air leaks at Defective pressure
pressure switch switch release valve.
release valve
Air leaks in air Defective air tank.
tank or at air
tank welds
Air leaks Leaking seal.
between head
and valve plate
Pressure It is normal for "some"
reading on pressure drop to occur.
the regulated
pressure gauge
(if equipped)
drops when
an accessory
is used
Air leak from Possible defect in
safety valve safety valve.
N020206

TROUBLESHOOTING

CAUSE
20 - ENG
CORRECTION
Move Auto/Off lever to the "Off"
position, if the unit does not shut off
contact a Trained Service Technician.
Contact a Trained Service Technician.
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 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.
Contact a Trained Service Technician.
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.
Contact a Trained Service Technician.
If there is an excessive amount of
pressure drop when the accessory
is used, adjust the regulator as
instructed in the Operation section.
NOTE: Adjust the regulated
pressure under flow conditions
(while accessory is being used).
Operate safety valve manually
by pulling on ring. If valve still
leaks, it should be replaced.