Quincy compressor having trouble starting

by marty
(greenforest ar 72638)

I have a Quincy compressor the tag by the oil fill tube is 3.1/2 x3 the top of tag is 230 14 143006s

i have run this for along time never had problems until today compressor doesn't come to full speed acts if motor pulls down

took belts off motor runs compressor has pressure on it but can turn by hand I think motor bad

does this compressor have a unloader on it it has a valve on side of compressor head for when you use a gas engine to pop off any information would be great it was my dads and I want to keep it up and running thank you

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