A friend of mine offered me this old air compressor that is otherwise getting scrapped. I am 90% sure its a Quincy. Its been sitting in the elements and is obviously rusty but I can clean that up. Step one is identifying the thing so I can price parts to see if it is a worthy candidate for a rebuild before mounting on a new tank. The ID plate is all rubbed off except for the punched numbers. Serial is there but the model number is gone. I think this info is also stamped on the crank, and can possibly also measure the bore to identify, but I wanted to see if anyone could recognize this to at least narrow to a model number. Pics attached.
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Old Quincy air compressor ID
- Thread starter Toyomech
- Start date
justanengineer
Well-known member
That’s one of Quincy’s QR25 line of commercial compressors, the best ever made IMHO and still sold/supported today. Dual unloaders means it’s single stage, which some will dismiss, but the 5 hp motor suggests it could be a larger single stage like a 230 or even bigger. Ultimately flow is the important figure, not cylinder or stage count, and the larger single stage Quincy’s can flow quite a lot. Before scrapping I’d investigate further. If you can find a bore x stroke marking on it then ID’ing via their sales literature is easy - google QR25. Worst case call Quincy and their IL customer support folks will prob tell you all about it from the serial. Even if it’s a smaller compressor, if it spins freely then I’d change the oil and see how it sounds bc it’ll still bring $1-300 on Craig’s if not a solid lump of iron. Those compressors last forever bc theyre lubed by an oil pump, not splash lubed like 99.9% of the rest.
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Thank you that is very helpful. I will measure bore and stroke and external dimensions to confirm. If it is a 230 and based on record of change 30 it would be from 1965. Amazing how long old equipment used to last compared to current day stuff.
Hobby_Man22
Well-known member
It's says on the motor 230v
csp
Well-known member
It's one of the larger single stage units, either a 230 or a 240.
Definitely old as it has the vane style oil pump.
Definitely old as it has the vane style oil pump.
TonyJ
Well-known member
On the side of the cylinder there should be a casting number usually 4 digits. What number is there and I’ll look at my list and see what all models shares the same cylinder and that’ll narrow it way down. The number stamped on the end of the crank is the roc #
TonyJ
Well-known member
If it’s 7888 then it’s a 230 if it has a stamp of 7889 then it’s a 240.