Craftsman 919.728001 Owner's Manual page 28

PROBLEM
Knocking Noise. Possible defect in safety
Excessive belt
wear.
Squealing
sound.
CAUSE
valve.
Defective check valve.
Loose pulley.
Loose flywheel.
Compressor mounting
screws loose.
Loose belt.
Carbon build-up in pump.
Belt to tight.
Loose belt.
Tight belt.
Loose pulley.
Pulley misalignment.
Compressor pump has no
oil.
Loose belt.
CORRECTION
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,
see Parts manual for torque
specifications.
Tighten flywheel screw, see
Parts manual for torque
specifications.
Tighten mounting screws,see
Parts manual for torque
specifications.
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.