Sears 919.727121 owner manual Troubleshooting Guide, Problem Cause Correction

TROUBLESHOOTING GUIDE

PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS OR COMPRESSED AIR SOURCES. PERSONAL INJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY REPAIRS, UN- PLUG THE COMPRESSOR AND BLEED OFF TANK AIR PRESSURE.

	PROBLEM	CAUSE	CORRECTION
Excessive tank pressure -		Pressure switch does not shut off	Move the pressure switch lever to the “OFF”
safety valve pops off.		motor when compressor reaches	position. If the outfit doesn’t shut off, and the
		“cut-out” pressure.	electrical contacts are welded together, replace
			the pressure switch.
		Pressure switch “cut-out” too high.	Return the outfit to Sears Service Center to check
			and adjust, or replace switch.
Air leaks at fittings.		Tube fittings are not tight enough.	Tighten fittings where air can be heard escaping.
			Check fittings with soapy water solution. DO NOT
			OVERTIGHTEN.
Air leaks at pressure switch		Defective pressure switch release	Remove and replace the release valve.
release valve.		valve.
		Defective flapper valve in manifold.	Check to see if the pin in the bottom of the
			pressure release valve is stuck. If it does not move
			freely, replace the valve.
			A defective flapper valve results in a constant air
			leak at the pressure release valve when there is
			pressure in the tank and the compressor is shut
			off. Remove and clean or replace valve.
		Check valve seat damaged.	Inspect and replace upper manifold assembly.
	Air leaks in air tank or at air tank	Defective air tank.	Air tank must be replaced. Do not repair the leak.
	welds.
			DO NOT DRILL INTO, WELD OR OTHER-
			WISE MODIFY AIR TANK OR IT WILL
			WEAKEN. THE TANK CAN RUPTURE OR
			EXPLODE.
	Air leaks between head and	Leaking seal.	Torque head screws to 8 ft. lbs. If this does not
	valve plate.		stop leak, replace seal.
Pressure reading on the		It is normal for “some” pressure	If there is an excessive amount of pressure drop
			when the accessory is used, adjust the regulator
regulated pressure gauge		drop to occur.
			following the instructions on page 7.
drops when an accessory is
used.			NOTE
			Adjust the regulated pressure under flow
			conditions (while accessory is being used).

D20414 Rev. 0 2/15/00 12 — ENG