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24-ENG
D26998
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.
Compressor or engine
mounting screws loose.
Loose flywheel.
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.
Check belt tension, see
Adjusting Belt Tension in the
Maintenance section
Check belt tension, see
Adjusting Belt Tension in the
Maintenance section
Stiffener bar loose.
Check both nuts and tighten if
required.
Low oil level (compressor
or engine)
Maintain prescribed oil level.
Add oil.
Tighten pulley set screw, see
Parts manual for torque speci-
fications.
Tighten mounting screws,see
Parts manual for torque speci-
fications.
Tighten flywheel screw, see
Parts manual for torque speci-
fications.