Need help identifying Quincy 370 compressor

[Dard]

I just acquired a Quincy compressor that is missing an ID tag. It has a 200 gal tank, 15hp motor and 6904 in the pump casting. Looking at previous threads with the same 6904, and one currently on Ebay, none have the ID tag- perhaps just a coincidence. Do I need to measure the bore size for a definitive answer, or, does the larger tank and motor place it as a 370?
The compressor was running when I removed it so I know there are not any major issues. Even though the oil looks very clean, I would be surprised if it has ever had much maintenance. Beyond an oil change, what would you recommend? It was cheap enough that I don't mind spending money on whatever it might need, but, don't want to spend the time on work that is not necessary.
It also came with a Hankinson 50 CFM air dryer. I've never used a mechanical dryer- Do they consume much power- ie do they run only when the compressor is running? Thanks for your help.

 

[pcmeiners]

Call Quincy with the info you have so far, the tank has a manufacture date on it, shaft end at pulley should have an RO number on it.

The unit looks in good shape other then grime, does not look too old, a real kick *** Quincy

If your worried about the air drier expense you could add a Hayden 1290 cooler to remove most of the heat from the air before it hits the Hankinson., Looked up the manuals and the Hankinson does not seem to have a pre-cooling coil, thus the Hayden DB1290.

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Personally I would pull the head, remove and wet/dry the valves, buy a new head gasket, check the bores, reassemble. Pull side cover, inspect the crank area, new side plate gasket, change the oil filter, add new oil. Check the tank inside, though it is not that old. Get an auto drain setup.

 

[Dard]

Thanks for the suggestions. I did call Quincy this morning and they insist without a tag there is no way to identify it. I can’t imagine there are too many models with 6904 in the casting-