motor over heats
(holly ridge,n.c. usa)
speedaire--mod #3JR76 as the press goes up the comp. becomes harder to turn. at zero press the comp. turns freely @ 30 pounds of press, I can barly turn the pully by hand. at 50 I cannot turn the pully by hand. what can you advice of this problem? thanks.
As air is being compressed into your tank, the pressure in the tank builds, and this causes back-pressure. The compressor pump, and the electric motor, have to work harder to pump air into the tank.
That's normal, and the system is designed to accommodate that increasing load.... unless!
That you can't turn the pump sheave by hand as the pressure in the tank increases doesn't surprise me, unless you are closely related to the incredible Hulk, that is.
As your motor works harder in response to the increasing load, the motor will get warmer. That, too, is normal... unless!
Unless you have a load issue, that is increasing that load beyond the capability of the motor. The motor then will get really hot, and may go off on thermal overload. If it goes off on thermal overload, don't just keep resetting it, but find out what's causing the higher load.
It could be....
-motor wearing out
-check valve seized
-pump mechanical issue
or even other things.
I can't begin to diagnose your compressor problem more than that from the information you have provided.
Takes A long Tpme To Build Up Air
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I think you are talking about the intake valve, Jerry, but from your description, I can't be sure.
Visit the Troubleshooting page, click on the link to won't build pressure, and there is a tips page linked from there that gives many of the reasons why a compressor won't build air pressure properly.