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PERFORMING TROUBLESHOOTING OR REPAIRS CAN EXPOSE MOVING PARTS OR COMPRESSED
AIR SOURCES. PERSONAL INJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY TROUBLESHOOTING
OR REPAIRS, THE ENGINE SPARK PLUG WIRE SHOULD BE REMOVED. NEVER OPERATE THE OUTFIT
WITH THE BELT GUARD REMOVED. THE BELT GUARD SHOULD BE REMOVED ONLY WHEN THE
SPARK PLUG WIRE IS REMOVED.
PROBLEM
Excessive tank pressure -
safety valve pops off.
Air leaks at fittings or hose.
Air leaks inside check valve.
Continuous air leak at un-
loader valve.
Air leaks in air tank.
Air leak from safety valve.
Knocking noise.
TROUBLESHOOTING GUIDE
CAUSE
Unloader valve does not release
pressure when tank reaches "blow-
off" pressure.
Tube or hose fittings are not tight
enough.
Defective or dirty check valve.
Defective check valve.
Defective air tank.
Possible defect in safety valve.
Defective check valve.
Loose pulley.
Low oil level (compressor or engine)
Loose flywheel.
Loose compressor or engine mount-
ing screws.
Loose belt.
Carbon build-up.
Stiffener bar loose.
16
CORRECTION
Unloader valve must be replaced.
Tighten fittings where air can be heard escaping.
Check fittings under soapy water solution. DO
NOT OVER-TIGHTEN.
Remove and clean or replace check valve. DO
NOT OVER-TIGHTEN.
Turn off engine, move unloader valve toggle lever
to vertical position. If air leaks out of tank through
unloader valve, clean or replace check valve.
Air tank must be replaced. Do not attempt repair
of any leaks.
DO NOT DRILL INTO, WELD, OR OTH-
ERWISE MODIFY AIR TANK OR IT WILL
WEAKEN.
Operate safety valve manually by pulling on ring.
If valve still leaks, it should be replaced.
Remove and clean or replace.
Tighten pulley set screw.
Maintain prescribed oil level. Add oil.
Tighten screw.
Check screws. Tighten as required.
Tension belt per instructions under "Engine -
Adjustments" section of this manual.
Remove the head and valve plate. Clean the
valve plate and the top of the piston. (Be sure
carbon does not fall into the cylinder.) Reas-
semble using new gaskets and torque screws 25
to 30 ft. lbs.
Check both nuts and tighten if required.
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