Porter-Cable C7501 Instruction Manual page 21

PROBLEM
Compressor is Prolonged excessive
not supplying use of air.
enough air
Compressor is not
to operate
large enough for
accessories
air requirement.
Hole in hose.
Check valve restricted.
Air leaks.
Restricted air intake filter. Clean or replace air intake filter. Do not
Loose belt.
Restricted Dirty air filter.
air intake
Motor will Motor overload
not run protection switch
has tripped.
Tank pressure exceeds
pressure switch
"cut-in" pressure.
Check valve stuck open. Remove and clean, or replace.
Loose electrical
connections.
Possible defective motor
or starting capacitor.
Paint spray on internal
motor parts.
Pressure release valve on
pressure switch has not
unloaded head pressure.
Motor will not Fuse blown, circuit
run (continued) breaker tripped.
CAUSE
Decrease amount of air usage.
Check the accessory air
requirement. If it is higher than
the SCFM or pressure supplied
by your air compressor, you
need a larger compressor.
Check and replace if required.
Remove and clean, or replace.
Tighten fittings.
operate the air compressor with the
filter removed. Refer to the Air Filter
paragraph in the Maintenance section.
Loosen wingnut and then
tighten wingnut until it contacts
the washer, plus one turn.
Clean or replace. See Air Filter
paragraph in the Maintenance section.
Refer to Motor Overload Protection
under Operation. If motor overload
protection trips frequently, contact
a Trained Service Technician
Motor will start automatically when
tank pressure drops below "cut-
in" pressure of pressure switch.
Check wiring connection inside
pressure switch and terminal box area.
Have checked by a Trained
Service Technician.
Have checked by a Trained Service
Technician. Do not operate the
compressor in the paint spray area.
See flammable vapor warning.
Bleed the line by pushing the
lever on the pressure switch to
the "Off" position; if the valve
does not open, replace switch.
1.
2.
3.
4.
21 - ENG
CORRECTION
Check fuse box for blown fuse
and replace as necessary. Reset
circuit breaker. Do not use a fuse
or circuit breaker with higher
rating than that specified for
your particular branch circuit.
Check for proper fuse. You
should use a time delay fuse.
Check for low voltage conditions
and/or proper extension cord.
Disconnect the other electrical
appliances from circuit or
operate the compressor on
its own branch circuit.