6.5 Hp the motor run for 10 sec and shuts off sputtering out

I have a 6.5 HP 60 gallon compressor and the motor kicks on for 10 seconds and shuts off as if it is fully pressurized and it is only at 10 PSI.

___________________
Drain the tank and start the compressor, with the lid off the pressure switch, and being super careful as this is a live box.

The switch should be on already if the pressure in the tank is zero, meaning power should flow to the start circuit immediately.

When the pressure in the tank reaches the point where the compressor stops, are you seeing the pressure switch trip off? If not, then it's not the pressure switch that is the problem. If the switch trips to off, cutting the power to the motor circuit at 10 HP (maybe check this with a multi-meter to see if power is still flowing or not) then it is likely the pressure switch that has failed.

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Craftsman Compressor Issues.

Trying to troubleshoot - 22 Gal. Craftsman is doing now. Run all day and never get over 50 psi

That is what my 22 Gal. Craftsman is doing now. Run all day and never get over 50 psi.

Reading some troubleshooting on the site, I wanted to look at the intake valve to see if it is bypassing.

In the exploded view of the book there is no such valve shown.

Additionaly, the regulator pressure dial shows looseness if squeezed gently. The plastic lens over it moves just a bit and the square connection nut of back of it is a bit loose also.

I would hate to have to haul it off to the scrap yard.

________________
Bill says....

OK, don't haul it off to the scrap yard. I've got it on good authority that an old, drained, compressor pump works real good as a boat anchor! :-)

At the top of the compressor pump there is normally a plastic gizmo that is the intake filter. You should be able to unscrew that to access the intake port.

With the compressor running, and carefully, feel around the intake port to see if air is huffing out. If it is, for sure, you intake valve is failing.

Check that out and let me know. K? It would be useful if you could give me your answer(s) as a comment here, so that I can follow our discussion as we try to figure out what is happening (or not happening) with your air compressor.

Cheers,

Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Craftsman Compressor Issues.

craftsman 7 gallon 125 psi air compressor - psi problem?

i just bought a new craftsman 7 gallon 125 psi air compressor. my problem is that the psi stops at 120 psi then slowly drops to 110 psi. it hold steady at 110 psi there are no leaks, is this normal or do i have a psi problem.






Bill wonders...

Howdy. Hmmm! You've got me a bit stumped on this one.

No, what you are seeing isn't normal. If you see a loss of air pressure then that air is going somewhere.

To better understand the problem, I'd like to know:

  • Does this happen every time?

  • DHow long does it take to drop from 120 to 110 PSI?

  • DWhat is attached to the discharge coupler from the tank?

  • Does air bleed slowly (and quietly) from the PRV valve?

  • When the compressor stops, place your hand under the unloader valve. Do you feel any air movement there?

  • When the compressor stops, place your hand over the intake valve. Do you feel any air movement there at all?


  • I need this info to try to understand your problem.

    Cheers,

    Bill

Click here to post comments

Add your own question or comment. It's easy to do. How? Simply click here to return to Craftsman Compressor Issues.