Attention Quincy Air Compressor Experts! Help Me Identify This Pump!

[dr_clyde]

One of my customers has given this air compressor and dryer setup to me on the condition that we remove it from the premises.

I can't seem to find a tag on it anywhere that tells the model. I'm pretty sure its a QR-350, but I can't seem to confirm that.

It is driven by a 10 HP motor, and is physically larger than the 325 I have currently.

On my 325 the tag is on the crank case dipstick cover, and it appears those have been replaced on the new one.

The crank case part number matches the one in a 350 exploded view parts list.

It will be an interesting removal. It is up 25 or 30 feet up in a mezzanine, and none of the forklifts will go that high. There is a telehandler on site, but they can't get it into the building. Looks like we have to dis-assemble it and lower the pieces down in a scissor lift one at at time.

He said they haven't used it in a long time, but it was supposedly maintained by a service as their backup compressor.

The timing is pretty good, I will be needing more air in my new shop and this will become the primary compressor, with the 325 plumbed in as backup.

I know these old Quincys are tanks, so I'm not terribly worried. Either way, the price is right.

 

[pcmeiners]

What a steal.....

Very nice unit, looks like a 350. Pump is very heavy, will require two big guys to lift (480lbs). Paint is original, unit was used very little. My client's unit is slow running compared to my QR 325. Believe Quincy had warping issue with the side plates and had an upgrade. This compressor will do all your needs. At 890 rpm 49 cfm . My friend's unit runs at about 500rpm, a lot less noise then at 890. Wish I had the extra cfm this has. Did you get a price on one of these units? Mortal man can't afford these new.

 

[dr_clyde]

Any other thoughts?

 

[930dreamer]

I like it, what are they asking for it? Looks like a QR-25 pump?

 

[dr_clyde]

I like it, what are they asking for it? Looks like a QR-25 pump?

The whole system is mine for the price of come and get it out of here.

I’m pretty sure it’s a QR-25 pump, just curious if there were any positive size identification other than the tag which is missing on this one.

 

[dkmc]

Nice! Great deal! YOU ****!



If I was you, I'd ask every maintenance guy in the plant about that new cover, where is the old one, and then do a through search for it. Only other POSITIVE size ID is take the head off and measure Bore and Stroke.

 

[dr_clyde]

Nice! Great deal! YOU ****!



If I was you, I'd ask every maintenance guy in the plant about that new cover, where is the old one, and then do a through search for it. Only other POSITIVE size ID is take the head off and measure Bore and Stroke.

Thanks.

Unfortunately the maintenance guys here don’t maintain the compressors. They hire a service that does it for them.

Even if they did it themselves, that cover is LONG gone. This place doesn’t keep clutter.

 

[DSLTRK]

You ****!


Is there any exposed beam-work you can safely attach a chain hoist to?

They got it up there somehow, and I don't think they took it apart to do it.

 

[dr_clyde]

You ****!


Is there any exposed beam-work you can safely attach a chain hoist to?

They got it up there somehow, and I don't think they took it apart to do it.

There are a few ways to get it down, but the building is under construction right now and there are obstacles and new construction to work around.

 

[mattblast]

How did it get up there in the first place? Even in pieces it will still be heavy and hard to move. And you rig a chain fall to the ceiling trusses and then lift it up, push over edge then lower?

 

[dr_clyde]

Guys, it’s like 30 feet in the air.

I’m sure it was put in during construction with a telehandler. No can do now.

 

[dkmc]

How big are they making Quadcopters these days?

 

[pcmeiners]

Worse case scenario, to make it easier to haul, separate the upper half from the crank case. Reassembly is not to difficult , gasket $20, better then a hernia repair .

 

[MoonRise]

Contact the company that did the servicing on the unit and get the scoop right from them.

Or contact Quincy directly and ask them.

But the model and serial number tag SHOULD have been on the handhole/inspection plate on the side of the crankcase, right below the dipstick. Nameplate decal part number is 110831. Warning decals are part number 127889.

Quick check on the Quincy website and a QR-350HP-10hp pump looks like the specs are 31.1 cfm at 822 rpm down to 23.4 cfm at 676 rpm. Min and max rpm is listed as 400-940 rpm. But that -might- be for the "high pressure" variant.

The low-pressure bore is 6" dia and the high-pressure bore is 3.25", stroke is 3.5".

The 3-groove (3 belt) sheave/pulley on the pump -should be- 19.5" dia if that unit is a QR-350.

But like your checking already showed, the crankcase part number is 6904 for a QR-350.

Takes 4 qt 30 oz of oil in the sump. (really Quincy? 4 qt 30 oz and not just 5 qt? )

230V 3-phase power is 28 amps and 460V 3-phase is 14 amps per the spec sheet.

Watch out for the duty cycle! Spec sheet says duty cycle is 10 minutes per hour duty cycle. That's a 17% duty cycle.

 

[redmondjp]

Contact the company that did the servicing on the unit and get the scoop right from them.

Or contact Quincy directly and ask them.

But the model and serial number tag SHOULD have been on the handhole/inspection plate on the side of the crankcase, right below the dipstick. Nameplate decal part number is 110831. Warning decals are part number 127889.

Quick check on the Quincy website and a QR-350HP-10hp pump looks like the specs are 31.1 cfm at 822 rpm down to 23.4 cfm at 676 rpm. Min and max rpm is listed as 400-940 rpm. But that -might- be for the "high pressure" variant.

The low-pressure bore is 6" dia and the high-pressure bore is 3.25", stroke is 3.5".

The 3-groove (3 belt) sheave/pulley on the pump -should be- 19.5" dia if that unit is a QR-350.

But like your checking already showed, the crankcase part number is 6904 for a QR-350.

Takes 4 qt 30 oz of oil in the sump. (really Quincy? 4 qt 30 oz and not just 5 qt? )

230V 3-phase power is 28 amps and 460V 3-phase is 14 amps per the spec sheet.

Watch out for the duty cycle! Spec sheet says duty cycle is 10 minutes per hour duty cycle. That's a 17% duty cycle.

You are incorrect about the duty cycle - I've got several QR-25 brochures and I'm quoting from Page 3: "It's 100% duty cycle rated."

 

[dkmc]

You are incorrect about the duty cycle - I've got several QR-25 brochures and I'm quoting from Page 3: "It's 100% duty cycle rated."

Yea, always thought they bragged about the 100% DC.

 

[MoonRise]

Yeah, I thought the QR was 'better' than that.

Main QR-25 webpage claims 100% duty cycle.

https://www.quincycompressor.com/products/reciprocating-piston/qr-25/

But the literature page turns up a 'spec sheet' for a QR-350

https://www.revbase.com/TagTeam/Client/Gallery.asp?startat=1&keywords=qr-350&cs=0&ftm=0&groupids=0#

QR-350HP TECH DATA
3/20/2019

https://www.revbase.com/TagTeam/client/Download.asp?FileID=7885810&DataID=2471626&ViewID=2&OrderID=0

which flat-out says

QR350HP-10HP

Duty Cycle 10 min per hr

 

[dr_clyde]

Well, either way I don't expect to run this compressor that hard.

It will be feeding a CNC mill and general fab shop work, but we really don't use a ton of air. My 325 keeps up fine, this is just future proofing for the CNC.

 

[redmondjp]

Yeah, I thought the QR was 'better' than that.

Main QR-25 webpage claims 100% duty cycle.

https://www.quincycompressor.com/products/reciprocating-piston/qr-25/

But the literature page turns up a 'spec sheet' for a QR-350

https://www.revbase.com/TagTeam/Client/Gallery.asp?startat=1&keywords=qr-350&cs=0&ftm=0&groupids=0#

QR-350HP TECH DATA
3/20/2019

https://www.revbase.com/TagTeam/client/Download.asp?FileID=7885810&DataID=2471626&ViewID=2&OrderID=0

which flat-out says

First, I don't have login rights for that revbase website that you linked to.

Second, I am surmising that the "HP" on the end of that model number is for "High Pressure", as some of these QR series will do up to 500psi or so. So my hunch is that the 10% duty cycle is for high-pressure operation.

For a standard maximum pressure of 175psi, that pump will run 24/7/365 for decades.

 

[dkmc]

First, I don't have login rights for that revbase website that you linked to.

Second, I am surmising that the "HP" on the end of that model number is for "High Pressure", as some of these QR series will do up to 500psi or so. So my hunch is that the 10% duty cycle is for high-pressure operation.

For a standard maximum pressure of 175psi, that pump will run 24/7/365 for decades.

I think you're right!

 

[396foxRN]

I'd go to your local industrial tool-rental place and see what kind of lift you might be able to rent for a day to get it outta there. Will be well worth it considering what could happen to you or the compressor when trying to 'cheap-out' on getting it down, particularly since you got it free anyway.