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PROBLEM
Knocking Noise.
Compressor is
not supplying
enough air to
operate
accessories.
CAUSE
Possible defect in safety
valve.
Defective check valve.
Prolonged excessive use of
air.
Compressor is not large
enough for air requirement.
Hole in hose.
Check valve restricted.
Air leaks.
Restricted air intake filter.
Operate safety valve
manually by pulling on ring.
If valve still leaks, it should
be replaced.
Remove and clean, or
replace.
Decrease amount of air
usage.
Check the accessory air
requirement. If it is higher
than the SCFM or pressure
supplied by your air
compressor, you need a
larger compressor.
Check and replace if
required.
Remove and clean, or
replace.
Tighten fittings.
Clean or replace air intake
filter. Do not operate the air
compressor with the filter
removed. Refer to the "Air
Filter" paragraph in the
"Maintenance " section.
21- ENG
CORRECTION
D24450
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