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25-ENG D27042
PROBLEM
CAUSE
CORRECTION
Knocking Noise.
Possible defect in safety
valve.
Operate safety valve manually
by pulling on ring. If valve still
leaks, it should be replaced.
Loose pulley. Tighten pulley set screw, see
Parts manual for torque
specifications.
Compressor mounting
screws loose.
Tighten mounting screws,see
Parts manual for torque
specifications.
Loose flywheel. Tighten flywheel screw, see
Parts manual for torque
specifications.
Loose belt.
Check belt tension, see
Adjusting Belt Tension in the
Maintenance section.
Carbon build-up in pump. Have checked by a Trained
Service Technician.
Belt to tight. Check belt tension, see
Adjusting Belt Tension in the
Maintenance section.
Excessive belt
wear.
Loose belt.
Tight belt.
Loose pulley.
Have checked by a Trained
Service Technician.
Pulley misalignment.
See Motor Pulley/Flywheel
Alignment paragraph in the
Maintenance section.
Squealing
sound.
Loose belt.
Compressor pump has no
oil.
See Oil-Checking paragraph 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.
Check belt tension, see
Adjusting Belt Tension in the
Maintenance section.
Defective check valve. Remove and clean, or replace.