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Old 06-06-2008, 06:02 PM
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Old Quincy air compressor

I acquired an old Quincy, model 325 two stage air compressor that is about 50 years old. It does run. I would like to find out what the various copper tubes do (one disconnected), what the various parts are and how to restore the connections. The pressure regulator has been disconnected, I'm trying to figure out how it works. One tube goes from the lower crankcase to the top of the compressor. Quincy sent me some pictures but no parts names or connection info. Thanks for any help. Johnny

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Old 06-06-2008, 06:33 PM
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I have one almost that old (1969 model) that still works just fine! Could you post some pics and maybe some more info on that old beast?
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Old 06-06-2008, 06:35 PM
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Post some pics of that so we can take a look..Several guys have had those..maybe we can figure out what tube goes where from that..

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Old 06-11-2008, 07:34 PM
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Quincy compressor

I have a picture of the compressor with the motor removed, tubes and piping also. I'm sandblasting the unit and repainting it. When I get it more assembled, I'll be able to send additional picts. The tag on the tank says it was assembled in 1953. The tank is a Weaver, compressor is Quincy, the motor was replaced in 1993 with the present 5 HP, it draws 31 amps. Previous owner sand the motor has very little use. I'm new to any forum and sending picts, so bear with me if it doesn't go thru the first time. John
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Old 06-11-2008, 08:13 PM
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How old is the tank? If it is original I would STRONGLY recommend having it hydo tested or even replaced. Corrosion in an old tank can be dangerous although most often it starts leaking first and usually, but not always, does not become too dangerous unless someone attempts to repair it which should never be done. The biggest problem with a really old tank is that it most likely has gone though so many charge/discharge cycles that the metal has fatigued from the expansion and contraction that normally occurs and basically it reaches the end of it's service life. This metal fatigue can be vary dangerous and when a tank fails under those circumstances it is more likely to do so violently, if that tank is 1953 model I personally would not even consider using it for safety reasons. I really like these old compressors and I know of a couple more as old as mine that the owners have used for many years and treasure them as much as I do mine. I have seen some old Quincy's that had absolutely unbelievable service time on them and still being used every day! One in particular has worn out two gas engines and a couple of tanks but that was during the THIRTY years the guy used it on his service truck(s) at the mines and this was doing regular duty, he has done nothing but regular service to this old pump which has since been retired but still does occasional duty in his home garage. Darn right I like those old Quincy's!
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Old 11-04-2009, 12:57 PM
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Old Quincy Air Compressors - Answers

The tube from the "bottom" goes to the unloader actuator on top of at least one cylinder valve. The open connection goes to the receiver and the valve operates to open to route pressure to the air operated unloader when the compressor stops and oil pressure falls below setpoint. This way the compressor starts unloaded and also unloads the cylinders when it stops.
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