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Quincy 325—no unloader—-ok to use?

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jayfrank5074

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Dec 1, 2013
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So my grandfather gave me an old Quincy 325. It was hooked to a Wisconsin 2 cylinder engine for blowing out wells while drilling them.

It has no unloader(block off plate) or the valve on the head. Is this ok to use on an air tank with a 5hp baldor? The unloader would be in the pressure switch like my Kobalt 80gallon.

I understand oil pressure runs the unloader.

Opinions?

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Little paint
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OccupantRJ

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I unload one of my compressors using a normally open electric solenoid right before where the output line enters the tank check valve. When the pressure switch cuts off, it also cuts off power to the valve, thereby opening it and bleeding pressure off the head.
 
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American Locomotive

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As long as your pressure switch has an unloader, and you hook it up, you will not have a problem. Just make sure the unloader is between the check valve and the compressor head. I've seen people hook that up wrong and the unloader just drains the entire tank.
 
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jayfrank5074

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I understand using a pressurestat that has the unloader built in, and to plum it right before the tank check valve. That is how my Kobalt 80gal unit works now.

The reason I am asking is should the compressor have no load as the oil pressure builds up?

This unit has sat up for quite awhile, but it was free.

I think I have a line in a Kobalt 60gal that has a bad motor and a knocking compressor to test this unit on.


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American Locomotive

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I really wouldn't worry about it. It's a compressor, not a race engine. If it has sat for a long time, you could just leave the discharge disconnected and motor it over a bit. You could also turn it by hand with no belt, and it should build some oil pressure. My smaller pressure-lube Quincy compressors will build a few PSI spinning by hand.
 
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jayfrank5074

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American Locomotive said:
I really wouldn't worry about it. It's a compressor, not a race engine. If it has sat for a long time, you could just leave the discharge disconnected and motor it over a bit. You could also turn it by hand with no belt, and it should build some oil pressure. My smaller pressure-lube Quincy compressors will build a few PSI spinning by hand.
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I did plan to let it run a bit with no discharge line initially. Probably let it build pressure afterwards and then maybe pull the side cover after I see the compressor is good for a good cleaning.


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seber

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I have an identical unit hooked up to a two hp electric motor with no unloader. I've been using it that way for ten years. It does not get daily use but for occasionally filling tires, air bubbles, blowoffs etc. I'm not worried about it. One or two restarts under pressure will not build enough heat in the motor to cause a problem. By the way, small piston engines are generally rated at least double their actual output. If it had a five hp gas motor, a two hp electric will be enough to drive it. If you are worried about it, you can use a slightly smaller drive pulley.
 
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