Old Air King compressor trips breaker at about 60 psi

by Charlie
(Tennessee)

I've got an old Air King compressor probably from the 50's or 60's that has developed a problem. This is the type of compressor that runs continuously and uses a bypass valve to allow the compressor to 'freewheel' when it reached full pressure but the motor continues to run.


My problem is that now it will start up and run but as it builds up pressure it puts more and more strain ion the motor. It is a one cylinder compressor and you can see the room lights pulsing in sync with the compressor.

At about 60 psi the back pressure is too much and the breaker trips.

I really like this old machine and would like to fix it. Any suggestions?
Thanks!

Comments for Old Air King compressor trips breaker at about 60 psi

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Aug 29, 2016
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Dec 05, 2015
Fault
by: Anonymous

Hi, I would suggest you check the motor supply voltage is correct and you have not got a supply problem first.

if this is ok, check the full load current of the motor on the data plate and test the motor with a clip ammeter see if the phases are balanced and what load the motor is under.

from this result is the motor is fully or over loading and tripping out the supply or the motor is part loaded or has a fault.

if the motor tests ok, I would look at the non return valve a blockage here can cause over pressure at the pump and the unloader will be monitoring the pressure from the tank not here.

is the gauge correct ?

are you over pressure ?
is the tank full of water (seen that before) ?

if you suspect the motor you would need to check the windings for balance across the phases or for insulation faults , have an electrician look at this if you are not sure !

other mechanical issues you could have are cylinder seize or bearing issues are the belts too tight ?

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