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Can you get a picture of the pump and motor labels?

Quincy QR-25 series pumps that start with a 3 are two stage while those that start with a 2 are single stage. The 310 is a two stage compressor with max working pressure of 200 PSI. It is primarily designed for HVAC and industrial control applications where CFM is less important than...

BTW the current version of 310 CFM ratings are at 175 PSI and it is rated for max continuous pressure of 200 PSI.

Your limiting factor in output is max pump RPM and that's just a matter of math between the pulley sizes. Common wisdom is that the lower 1700 RPM motors have more torque and will probably last longer as they have to work less hard at startup, allow for lower belt tension which helps motor...

Bigger motor sheave/pulley = more RPM at the pump and all things being equal the extra pump RPM require an equivalent increase in horsepower at the same air pressure. In your scenario you can't double the motor pulley size after going to 3HP since that would put you at well over max pump rpm...

I spoke to Quincy technical support and as usual the technician I spoke with was great. He described the continuous run behavior and stated that unloaded air should escape through the air filter only and that if any air is escaping the pilot that the internal check valve isn't sealing and that...

Here's a video of the compressor and pilot valve behavior.

OK so there's no check valve on the tank fitting for the piping to the pilot valve. So looking at this, what's stopping tank pressure from escaping when the pilot valve trips at the high pressure point?

OK I found a tutorial for adjusting the pilot unloader valve and was able to set it to 110 off 90 on without much issue. The fact that tank pressure is dropping while the unloader is tripped indicates a bad check valve at the tank right?

I hauled it home today, and noticed that it doesn't have a pressure switch so obviously set up for constant run. I plugged it in to check it out and it came right to life. This is by far the quietest compressor I've ever heard. Granted with its 1.5hp motor and small sheave its only turning the...

I've never seen a Z184 frame designation. Any idea if I can use a 184T or do I need to wait to get it home and take measurements to see if it is comparable?

Heh, I just bought one for $50 while I continue my search for a bigger brother! Mine is a ROC19 with no pressure gauge, does that mean it's not pressure lubed? I actually bought it remotely while on a business trip and can't wait to pick it up and start messing with it on Saturday.

Seller sent a few more pictures and it appears that I may have scored pretty decently as this is a 216. Only a 1.5 HP motor on it, but evidently will take up to a 3HP motor and make ~10cfm at max pressure according to this thread. Not bad for $50, I am out of town and won't be able to check it...

Last week I made arrangements to pick up the Speedaire on Saturday and as I was about to hitch up the trailer got an email that stated that he sold it on Friday. So this is turning into quite the ordeal. So back to the drawing board. I'm traveling this week and saw this unit for $50 and...

First two digits are the year? I would think Quincy should be able to provide the ROC via the S/N.

Here's the SN for the Quincy Pump

Oh and it turns out the Speedaire from the top of the thread is still available for $300.

Seller sent a short video, not sure it tells any story other than the motor turns and the pump isn't seized.

No I haven't gotten the video yet, I have seen various Quincy rebuild videos with before and after of rod knock so should know what to listen for. Horizontal tank not ideal, but they are the ones that seem to come up more often with the Industrial pumps so I think I'm prepared for that. I can...

Yes single phase. Assume this motor needs a mag starter, correct? It's 3 hours away though, so dragging a trailer that far I'm pretty committed lol. It's been on CL for quite a while but not listed as a Quincy.