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Hi, There are different posibilities. I would need more information. Was it always like that? Does the guage on the main tank and the guage on the regulator both not show more than 20psi? When the auto shut-off is triggered do you feel there is more than 20 psi in the tank?
To increase the life of your compressor you will need to lower the pressure setting of your pressure switch, or replace it with new one that will cut-out at 120. Most compressors have the pressure switch set to cut-out at about 125 psi. Lately, I have seen compessors being sold with factory set pressure from 150 to 200psi. Most single stage compressors can easily handle 120 to 125, however higher pressures are pushing the motor/pump to the limits. This is like driving your car at full speed everywhere you drive. Your car lasts many years because for the most part, you are only uning 20 to 40 % of capacity. Problem is that pressure switch is not really designed to be adjusted (factory set) but not impossible. Look for model number of the pressure switch itself and google for more info. If in fact it cannot be adjusted replace it with generic switch at lower setting. The lower the pressure cut-out , longer life of motor pump. Tiny hole in head is an unloader of sorts and helps the motor to overcome head pressure (yes, this method is less efficient than using pressure switch with unloader valve, however cheaper to build).
the start capacitor on the motor body is weak,the motor needs this component to over come the air pressure when cycling to re-build the low air pressure,change both the start and run capacitors when doing the start because the other run capacitor is just as old and it will soon fail
Yes...the drain valve on the bottom of the tank is just a standard 1/4 Drain Pedcock that you can purchase at most hardware store.
You can also find these in the hardware section of Lowes or Home Depot where they sell the Air Compressors.
It could be that the input air filter is badly clogged. I might more likely be that the Non-return valve on the air tank input is not sealing properly and not allowing the tank to build up pressure. This valve is at the end of the main pipe runs between the compressor and tank. It could also mean (less likely) that the poppet valves inside the compressor cylinder head are not sealing properly. Other faults could be worn rings on the compressor pistons or a bad seal between the compressor cylinder head and block.
To check the Non return valve allow compressor to build up some pressure and then loosen union nut on Non return valve. There should be some air released at first but should stop if valve is ok. If leaking remove valve and check for dirt and clean. If valve still leaks replacement is the only fix.
The burst of air you hear as the compressor shuts off is the cylinder unloading so it will not have to restart against a high pressure load. If the unloader is electrical it would explain the hum that you hear. This could be a normal function.
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