Porter-Cable N028591 Troubleshooting, Problem Cause Correction, Replace or Clean Check Valve

TROUBLESHOOTING

Risk of Unsafe Operation. Unit cycles automatically when power is on. When servicing, you may be exposed to voltage sources, com- pressed air, or moving parts. Before servicing unit unplug or disconnect elec- trical supply to the air compressor, bleed tank of pressure, and allow the air compressor to cool.

PROBLEM	CAUSE		CORRECTION
Excessive	Pressure switch does	Move Auto/Off lever to the "Off"
tank pressure	not shut off motor when	position, if the unit does not shut off
- safety valve	compressor reaches	contact a Trained Service Technician.
pops off	"cut-out" pressure.
	Pressure switch "cut-	Contact a Trained Service Technician.
	out" too high.
Air leaks at	Tube fittings are not	Tighten fittings where air can be
fittings	tight enough.	heard escaping. Check fittings
		with soapy water solution. DO
		NOT OVER TIGHTEN.
Air leaks at	Check valve seat	A defective check valve results in
or inside	damaged.	a constant air leak at the pressure
check valve		release valve when there is pressure in
		the tank and the compressor is shut
		off. Replace check valve. Refer the To
		Replace or Clean Check Valve in
		the Service and Adjustments section.
Air leaks at	Defective pressure	Contact a Trained Service Technician.
pressure switch	switch release valve.
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				Risk of bursting.
		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 Technician.
between head
and valve plate
Pressure	It is normal for "some"	If there is an excessive amount of
reading on	pressure drop to occur.	pressure drop when the accessory
the regulated		is used, adjust the regulator as
pressure gauge		instructed in the Operation section.
(if equipped)		NOTE: Adjust the regulated
drops when		pressure under flow conditions
an accessory		(while accessory is being used).
is used
Air leak from	Possible defect in	Operate safety valve manually
safety valve	safety valve.	by pulling on ring. If valve still
		leaks, it should be replaced.

20 - ENG