21 GALLON CENTERAL PNUMATIC AIR COMPRESSOR SHUT OFF SWITCH PRICE

That is exactly what you will get, There are no repair parts. buy oil lubed compressor. be aware that the comp may not deliver enough air at high pressure for task.

MCGRAW 21 gallon 175 PSI Oil-Free Vertical Air Compressor
CENTRAL PNEUMATIC 29 gallon 2 HP 150 PSI Cast Iron Vertical Air Compressor

The pressure switch turns on the power when it's low and shuts it off when the pressure has come up. There is a lever on the side of the switch that manually shuts the compressor off. Check both .

check the pressure switch

You can use a generic replacement , I would check "Drillspot".

Don F

Hi,
Two things to check... the wiring to the compressor may not be a heavy enough gauge to support the current draw...

The start capacitor on the motor may be going bad...

heatman101

I would first find out what pressure the compressor is supposed to shut off at. If it is supposed to shut off at lets say 110 then the pop off valve is doing its job you have to reset the pressure switch so it shuts off less than 120 pounds.

sounds like the unloader/check valve is stuck or damaged. This is the part that holds the pressure in the tank and allows the compressor to start up without being under pressure

Pressure switch setting is off. Readjust to Mfg. spec. (on @ 60/off @ 8o...)

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

1)Let your unit pump up.
2)Turn it off.
3)Find the supply line from the pump to the tank.
4)Remove the supply line from the pump head.
5a)If you hear air coming from the tank you have a bad check valve.
5b)If you do not hear air coming from the tank, you have a leaky
pressure switch.