DeWalt 66-651 instruction manual Troubleshooting, Problem Cause Correction

TROUBLESHOOTING

Performing repairs may expose voltage sources, moving parts or compressed air sources, moving parts or

compressed air sources. Personal injury may occur. Prior to attempting any repairs, unplug the air compressor and bleed off all air tank air pressure.

PROBLEM	CAUSE	CORRECTION
Excessive tank	Pressure switch does not	Move On/Auto/Off lever to
pressure - safety	shut off motor when	the "OFF" position, if the
valve pops off.	compressor reaches "cut-	outfit does not shut off
	out" pressure.	contact a Trained Service
		Technician.
	Pressure switch "cut-out"	Contact a Trained Service
	too high.	Technician.
Air leaks at	Tube fittings are not tight	Tighten fittings where air can
fittings.	enough.	be heard escaping. Check
		fittings with soapy water
		solution. Do Not
		Overtighten.
Air leaks at or	Check valve seat damaged.	A defective check valve
inside check		results in a constant air leak
valve		at the pressure release valve
		when there is pressure in the
		tank and the compressor is
		shut off. Replace check
		valve. Refer to the "To
		Replace or Clean Check
		Valve" in the "Service and
		Adjustment" section.
Air leaks at	Defective pressure switch	Contact a Trained Service
pressure switch	release valve.	Technician.
release valve.
Air leaks in air	Defective air tank.	Air tank must be replaced.
tank or at air		Do not repair the leak.
tank welds.
		Do not drill into, weld or
		otherwise modify air tank
		or it will weaken. The tank
		can rupture or explode.
Air leaks	Leaking seal.	Contact a Trained Service
between head		Technician.
and valve plate.

19- ENG D26195