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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 to tight.
Excessive belt
Loose belt.
wear.
Tight belt.
Loose pulley.
Pulley misalignment.
Squealing
Compressor pump has no
sound.
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,
145-165 in.-lbs.
Tighten flywheel screw,
33-37 ft.-lbs.
Tighten mounting screws,
20-25 ft.-lbs.
Check belt tension, see
Adjusting Belt Tension in the
Maintenance section.
Have checked by a Trained
Service Technician.
Check belt tension, see
Adjusting Belt Tension in the
Maintenance section.
Check belt tension, see
Adjusting Belt Tension in the
Maintenance section.
Check belt tension, see
Adjusting Belt Tension in the
Maintenance section.
Have checked by a Trained
Service Technician.
See Motor Pulley/Flywheel
Alignment paragraph in the
Maintenace section.
See Oil-Checking paragraph in
the Maintenace section.
Check belt tension, see
Adjusting Belt Tension in the
Maintenance section.
25- ENG
CORRECTION
D24225
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