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I am trying to repair a broken switch on a craftsman compressor the electric motor is model number is 91916415

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  • amberjason Apr 01, 2011

    Hi Kelly,

    Thanks for getting back to me. I am not sure how to tell the difference between the pressure switch and the start switch. The on and off switch is 2" that turns the pump on and off. There is a pressure relief valve that I can manually pull and air will escape. Does this valve automatically come on if the pressure gets to high? Before the on off switch broke the compressor would turn off automatically when the pressure got to the right level. Now I am not confident that it will turn off.

    Hope that helps, Scott



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Hi and welcome to FixYa. I am Kelly.
I am trying to sort out which switch is broken. Is it the Motor start switch (Centrifugal) or the pressure switch?

There is this switch: ( item 24 / $85.99 )

If it is the centrifugal start switch I need to know a lot more about this motor. There has to be another data plate on it with different numbers. I need all of the numbers you can locate on the motor. Note the motor itself is "no longer available."


Posted on Apr 01, 2011

  • Kelly
    Kelly Apr 01, 2011

    Hi Scott,

    All aircompressors by law must have a "High Pressure Relief Valve" and most of them are set some where beween 150 and 175 Psi. The reason they all have this valve is that in case of a pressure switch failure you do not rupture / explode your tank. When they actuate it will get your attention quick. Trust me you will know when it opens.

    From everything I am reading and all the research I have done the switch (Item 24) of the link in my first response is an all in one switch that includes the on / off switch and the pressure switch. It appears that there is also a line pressure release in the switch assembly so that there is not too much head pressure on the pump which enables the motor to start when the pressure switch is telling the motor to start. I.e it prevents the motor from burning up.

    I downloaded the owners manual and it was useless in trying to get detailed view of the switch. You would think a manufacturer would at least show a picture of the operating controls in their manual.

    I personally would not be comfortable operating the pump if it is not automatically cycling. You could install one of these switches:

    It would just be a matter if connecting the power cord to the switch and the motor wires. I would NOT remove the old switch as it still functions to relieve head pressure for motor stating. (mechanical) yet, you can electrically isolate it and install a new switch. You would have to do some creative 1/4' tube plumbing to install the new switch but it can be done.

    If you want it fixed right... the $85.00 on / off / pressure switch is the only option.




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