Excell Precision E7540 operation manual Troubleshooting

PROBLEM

CAUSE

CORRECTION

Excessive

Pressure switch does not

Move On/Auto/Off lever to

tank pressure

shut off motor when com-

the "Off" position, if the unit

- safety valve

pressor reaches "cut-out"

does not shut off contact a

pops off.

pressure.

Trained Service Technician.

Contact a Trained Service

Pressure switch "cut-out"

Technician.

too high.

Air leaks at

Tube fittings are not tight

Tighten fittings where air can

fittings.

enough.

be heard escaping. Check fit-

tings with soapy water solu-

tion. DO NOT OVER TIGHTEN.

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 the "To Replace

or Clean Check Valve" in the

Service and Adjustments

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 be-

Leaking seal.

Contact a Trained Service

tween head and

Technician.

valve plate.

A18791

22-ENG