Binks air compressor

[Hank10]

Not sure where to post this, so I will start here. I recently acquired a new to me compressor. Having trouble finding info on It, as I think it may have been fabricobled to what it is here. The compressor head says Quincy 212-17. Have some feelers out to Quincy to get literature on it but they are having trouble. I have quite a bit of paperwork on the Binks line up. Also the oiler and unloaders arnt connected? I have run it on 220 and runs great, but builds to 175psi! So I need to address the pressure switch! Let me know what you guys think!

 

[The Tool Tyrant]

Nice. It's a single stage pump, so I'm shocked that it building that much pressure. This is my first time seeing a model 212.

So someone by-passed the hydraulic unloader (probably inoperable, I'd guess) and plumbed the head unloaders directly to the pressure switch. That being said, the pump will currently not have the function of the hydraulic unloader which keeps the pump unloaded until oil pressure raises high enough to close the unloaders.

I checked the Quincy literature library and found the oldest 212 ROC of 25 listed. There is also a list of all changes made to the various ROC, which dates your ROC 17 of 1925 or 1928 as the last digit is not clear.

 

[Hank10]

I had no idea someone posted a reply to my comment! Thank you! I’m still learning these forums. I have not hooked up the compressor since i originally purchased. Is this ok to run this way? With the hydraulic unloader unhooked? I’d like to try to hook up correctly, or how it was from factory, but not sure how it’s supposed to be connec

 

[seber]

You can run it that way but it is hard on the motor. I would definitely reduce the cutout pressure though.

 

[The Tool Tyrant]

Well Hank, I checked Quincy's literature library again and the oldest ROC for the 212 is still ROC 25, so it appears they haven't found any additional info for the ROC 17. On the later ROC model, the oil pump is located where your hydraulic unloader is and the unloader is around the corner on the right side. Take a look at the Binks ad, which shows the correct plumbing layout...receiver pressure to bottom of hydraulic unloader, top of hydraulic unloader to unloader tower.
The idea is that when the motor starts, until the hydraulic unloader sees oil pressure, which opens and closes a valve allowing receiver air pressure to the unloader towers the pump will not begin to make pressure. This action has 2 benefits, first, it allows the motor to start without a load, second, it allows the pump to have oil pressure before loading it.
I would have to guess that the hydraulic unloader has failed to function (due to worn internals) and was just bypassed.
The current single stage QR Quincy's only show 100 PSI as the maximum CONTINUOUS operating pressure, and a couple of models (108, 206 & 210) with a maximum INTERMITTENT operating pressure of 150 PSI. Does the Binks ad have any info regarding pressure rating?

 

[MacMcMacmac]

You are getting zero unloading with the current configuration. If you set up the lines as shown in the Binks ad, and the compressor won't build pressure, it may be a failed hydraulic unloader valve, or you might actually have no oil pressure.

 

[Hank10]

Good morning guys! Thanks for all the replies! So I have not had the compressor running since I originally purchased. When I did purchase, we ran compressor, untill it shut off, which was at 175ish psi. So I can easily have it shut off at the required 100 psi.

Would there be any long term issues (if there isn’t already) if I run it in its current state?

If I would re-plumb the copper line, like how it calls for from factory, and it does not pump air, does that mean the hydraulic unloader doesn’t work?

I will include a photo of the BINKS info. It does state the min/max psi, which is 80/100.

 

[oldmachinenut]

Hank,

I have a 1947 Quincy 310 ROC-14 that has that same unloader. It is splash-lube and the unloader is activated by centrifugal weights on the crankshaft end.

 

[Hank10]

You are getting zero unloading with the current configuration. If you set up the lines as shown in the Binks ad, and the compressor won't build pressure, it may be a failed hydraulic unloader valve, or you might actually have no oil pressure.

So I put a new pressure switch on, 80 on, 100 off. I also connected the hoses as shown on the BINKS ad. And what do ya know, it builds air pressure. It builds pressure to about 105, then cuts out. It’s a bit slow from 0-100, but she builds air. Now the next problem is now air is leaking out of one of the top towers, so I’ll have to dig into that next.

So if I understand this type of compressor, the motor starts, and will not allow the compressor to build air, until it has oil pressure. Once oil pressure is sufficient, it opens the unloader, and builds to desired pressure, then shuts off motor. And releases any pressure on top of piston, so motor can start easily.

 

[MacMcMacmac]

OldMachineNut is correct. I keep forgetting these old Quincys were splash lube. We even discussed it before. My sometimers is getting more frequent.

At any rate,if there is a constant bleed, one or both discharge valves are leaking, since they also act as the check valve on some Quincys.

 

[Jpkimmel]

So that compressors unloaders do not operate off oil pressure as that compressor is not pressure lubricated. It is operated off of centrifugal weights that close a normally open valve. When the compressor gets up to speed, it closes the valve and that turn stops the pressure to the unloaders and allows them to let the valves operate normally. When the pump shuts off and the RPM is slow down, the weights reopen the closed valve and air flows to the unloaded towers and relieves the pressure in the cylinder heads The oiling system on that is a slinger ring style.

 

[Jpkimmel]

The air leaking out of the tower could be one of two things could be a cracked old brittle diaphragm gasket or the disc valves, leaking pressure back into the cylinder from the tank. Those disc valves act as the check valve so on a non-modified Quincy Compressor QR series there is no check valve after the discharge valve.

 

[The Tool Tyrant]

Thanks to OldMachineNut & MacMcMacmac for sharing their knowledge regarding the OLD Quincy's being splash lubed.
I learn something new here daily!