Porter-Cable C7501 Instruction Manual page 22

PROBLEM
Knocking Noise Possible defect in
safety valve.
Defective check valve.
Loose pulley.
Loose flywheel.
Compressor mounting
screws loose.
Loose belt.
Carbon build-
up in pump.
Belt too tight.
Excessive Loose belt.
belt wear
Tight belt.
Loose pulley.
Pulley misalignment.
Squealing Compressor pump
sound has no oil.
Loose belt.
CAUSE
Operate safety valve manually
by pulling on ring. If valve still
leaks, it should be replaced.
Remove and clean, or replace.
Tighten pulley set screw.
Tighten flywheel screw.
Tighten mounting screws.
Loosen wingnut and then
tighten wingnut until it contacts
the washer, plus one turn.
Have checked by a Trained
Service Technician.
Loosen wingnut and then
tighten wingnut until it contacts
the washer, plus one turn.
Loosen wingnut and then
tighten wingnut until it contacts
the washer, plus one turn.
Loosen wingnut and then
tighten wingnut until it contacts
the washer, plus one turn.
Have checked by a Trained
Service Technician.
See Motor Pulley/Flywheel
Alignment paragraph in the
Maintenance section.
See Oil-Checking paragraph
in the Maintenance section.
Loosen wingnut and then
tighten wingnut until it contacts
the washer, plus one turn.
22 - ENG
CORRECTION