Porter-Cable C7550 Instruction Manual page 21

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
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.
TROUBLESHOOTING
CAUSE
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.
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.
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.
21-ENG
CORRECTION
Risk of Bursting.
Do not drill into,
1000003897