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25- ENG
D28301
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.
Compressor mounting
screws loose
Tighten mounting screws,see
Parts manual for torque
specifications.
Carbon build-up in pump Have checked by a Trained
Service Technician.
Squealing
sound.
Compressor pump has no
oil.
See Oil-Checking paragraph in
the Maintenance section.
Defective check valve. Remove and clean, or replace.
Air vent on
dipstick is
blocked
Air vent clogged with
debris
Clean air vent or replace
dipstick