Sears 919.72512 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, UNPLUG THE COM- PRESSOR AND BLEED OFF TANK AIR PRESSURE.

PROBLEM	CAUSE	CORRECTION
Excessive tank pressure - safety	Pressure switch does not shut off	Move the pressure switch lever to the “O”
valve pops off.	motor when compressor reaches	position. If the compressor doesn’t shut off,
	cut-out pressure.	disconnect from the electrical outlet source
		and return to a Sears Service Center to re-
		place the pressure switch.
	Pressure switch cut-out too high.	Return the compressor to Sears Service Cen-
		ter to check and adjust, or replace switch.
Air leaks at fittings or hose.	Tube or hose fittings are not tight	Tighten fittings using teflon tape where air
	enough.	can be heard escaping. Check fittings with
		soapy water solution. DO NOT OVER-
		TIGHTEN.
Air leaks at pressure switch	Defective pressure switch release valve.	Return to Sears Service Center for replace-
release valve.		ment of pressure switch.
		Check to see if the pin in the bottom of the
		pressure release valve is stuck. If it does not
		move freely, return to the Service Center for
		replacement of pressure switch.
	Defective or dirty check valve.	A defective check valve results in a constant
		air leak at the pressure release valve when
		there is pressure in the tank and the com-
		pressor is shut off. Remove and clean or re-
		place check valve. DO NOT OVERTIGHTEN.
Air leaks in air tank or at air tank	Defective air tank.	Air tank must be replaced. Do not repair the
welds.		leak. Return compressor to Sears Service
		Center.
		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 valve	Leaking seal.	Torque head screws to 7-10 ft. lbs. If this
plate.		does not stop leak, replace seal.
Pressure reading on the regu-	It is normal for some pressure drop	If there is an excessive amount of pressure
lated pressure gauge drops when	to occur.	drop when the accessory is used, adjust the
an accessory is used.		regulator.
		NOTE
		Adjust the regulated pressure under flow
		conditions (while accessory is being used).
Air leak from safety valve.	Possible defect in safety valve.	Operate safety valve manually by pulling
		on ring. If valve still leaks, it should be
		replaced .
Knocking noise	Defective check valve.	Remove and clean, or replace.

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