Craftsman 919.167780 Operator's Manual page 17

PROBLEM
Knocking Noise.
Compressor is not supplying
enough air to operate accessories.
Regulator knob has continuous air
leak.
Regulator will not shut off air out-
let.
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
Damaged regulator
Damaged regulator
CORRECTION
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 require-
ment. 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
Replace
Replace
17-Eng D22130