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PROBLEM
Air leaks (cont)
Low Discharge Pressure
Knocking
CORRECTION
Operate safety valve manually by
pulling on ring. If valve still leaks, it
should be replaced.
A defective check valve results in a
constant air leak, back through the
unloader valve when there is pressure
in the air tank and the compressor is
not running. Turn the engine off; move
the unloader valve toggle lever to the
vertical position. If air leaks out of the
tank through the unloader valve, clean
or replace the check valve. (DO NOT
OVERTIGHTEN).
Decrease amount of air usage.
Remove and clean, or replace.
Clean or replace air intake filter.
Tighten fittings.
Check and replace if required.
Repair or replace.
Tighten pulley set screw.
Check oil level and maintain at
prescribed level.
Remove and clean or replace.
Follow oil recommendations listed
in the "Gasoline Engine Owners
Manual".
Check all bolts and tighten as
required.
Remove the head and valve plate.
Clean top of piston and bottom of
valve plate. Reassemble using new
gasket and torque screws to
35 foot-pounds.
PAGE 22
CAUSE
Air leak in safety valve.
Defective check valve.
(Unloader valve)
Prolonged excessive use of air.
Restricted check valve.
Restricted air intake filter.
Air leaks.
Hole in hose or air piping.
Faulty pump.
Loose pulley.
Low oil level (compressor pump
and/or gasoline engine).
Restricted check valve.
Wrong oil used.
Compressor and/or engine bolts
loose.
Excessive carbon deposits in head.
TROUBLESHOOTING CHART (Continued)