Compressor unloading problem

I have a speedaire compressor model 3JR76.
After it runs for an hour it sometimes does not unload when it reaches its set pressure. When this happens the motor trips out. If I let it sit and it then starts fine again. I do not have a manual but would like one if you can help with this as well.

Thanks in advance for your help
Dick

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Bill says...

It sounds as though you may have a pressure switch issue.

Here is info on pressure switches.

Regarding your manual, if you haven't contacted Grainger as yet, that's your best bet. Follow the guidelines on the Speedaire page on this site.

If you have and they cannot help then please post your request here.

Cheers,

Bill