Quincy 325 - Which way should it rotate?

DistantHorizon · Dec 14, 2011

Got a used 325 on an 80 gallon tank, got a new single phase 5hp motor, got a used magnetic starter box with appropriate guts. Ready to wire up to see if the pump is any good.

Compressor guy I talked with said it doesn't matter which way it rotates, as it is splash lube, but I think he is wrong.... I'm under the impression that unless it's a very old 325, it is pressure lubed (after all, it's got an oil pressure gauge), and I would think that would require it to rotate in a specific direction.

Thanks for any help!

larry_g · Dec 14, 2011

http://www.mesaequipment.com/Html/Products/Quincy/qr25_basic.html

If you read the above link you will see that they are reversible but require a different flywheel and oil pump modification if you do.

lg
no neat sig line

Speed-Racer · Dec 14, 2011

This is a great youtube video of a quincy compressor rebuild. Please post pictures of your project.

Jagmandave · Dec 14, 2011

Isn't there a mark on the flywheel?

larry_g · Dec 14, 2011

Speed-Racer said:
This is a great youtube video of a quincy compressor rebuild. Please post pictures of your project.

If you look at the vid above you will see a rotation arrow right behind the pressure gauge and an instruction on the bottom of the plate if it is reversed then the rotation is also the other way.. Check your oil pump plate for arrows..

In this vid at approx 10 minutes he assembles the pump and shows the top/rotation arrow.

lg
no neat sig line

DistantHorizon · Dec 14, 2011

So larry_g's link says the normal compressor rotation is counterclockwise, though I wasn't sure of which end to look at.

Yeah, I found the youtube video while looking, but it seemed like a lot of watching and I didn't know if he'd mention the rotation direction.

No, the pulley doesn't have a mark, I thought it would too.

I think the first photo shows the correct rotation - it's the little arrow below the word "TOP", correct? So it'll rotate clockwise when looking at the oil pump end, and counterclockwise when looking at the pulley end.

Intercooler tube was bent and fins crushed by the belt guard (not pictured) when someone (not me) tipped the compressor while loading it without having it slung securely.

Not sure if it will hold pressure or not.

oilslick · Dec 14, 2011

gotta love the quincy sound heres an oppurtunity to post mine, sorry I have to do it.

Steevo · Dec 14, 2011

If you can't tell by looking at the flywheel/pully on the pump, then you shouldn't mess with it anyway.
i.e: The blue unit above has to rotate CCW when facing at the flywheel side of the pump.

930dreamer · Dec 14, 2011

In the last pic, does the 8 o'clock flywheel spoke have an arrow on it?

DistantHorizon · Dec 14, 2011

Steevo said:
If you can't tell by looking at the flywheel/pully on the pump, then you shouldn't mess with it anyway.
i.e: The blue unit above has to rotate CCW when facing at the flywheel side of the pump.

If you're referring to the the way the pulley will blow air, yeah, I had thought the pulley would have to push air across the pump. Compressor guy I know said it could be set up to pull air across (though I would think you'd have to have a shroud for that to work effectively).

I have started to question a lot of the things said compressor guy says, which is why I came here in the first place.

71flh · Dec 14, 2011

I think of the spokes of the compressor pulley as fan blades so as already mentioned, CCW looking at the pulley.

That's what moves air over the cylinder to cool it/them.

Is it me or does the size of the motor pulley seem a bit large?

DistantHorizon · Dec 14, 2011

930dreamer said:
In the last pic, does the 8 o'clock flywheel spoke have an arrow on it?

It does kinda look like one, doesn't it? I'll have to look again, but I could swear I've checked for an arrow. Been a while since I've messed with it, will check when I do.

olytdi · Dec 15, 2011

I have this compressor. The flywheel must fan the compressor with airflow. The oil pump structure needs to be reversed (flipped 180 deg.) if you wish to reverse the direction of the flywheel. These are oil bath but splash only in the proper orientation. Mine has a pressure safety swith coming off of the oil pump line that in yours, goes to the pressure gauge.

PM me if you want me to email you all of the owner's manuals, tear-down manual, and parts lists. I have them from Quincy in PDFs.

hofferwood · Dec 15, 2011

BEGINNING WITH CHANGE RECORD NO.6 THE 30020 PLAIN MACHINE
SPLASH TYPE LUBRICATION SYSTEM IS REPLACED
BY A VANE TYPE OIL PUMP. THIS CHANGES
ENTIRE LUBRICATION SYSTEM

Mine has a record of change #1

This is splash lube

Yours turns ccw as stated, to force air over the pump and intercooler.
Chuck

DistantHorizon · Dec 18, 2011

I am a *******. I had looked on the rim of the compressor pulley for an arrow; I did not look on the fan spokes, where the directional arrow is located.

Anyway, got it wired in and up and running just now. Oil pressure is low (falls to 15psi when pressure starts getting up there, is supposed to be at least 18-20, so I will adjust that (thanks to documentation olytdi sent me, I think I know how). Belt slips on startup too, so I'll have to address that as well.

Not sure why oil pressure is low, guessing it could be
* Old 3-phase motor spun the compressor faster
* Oil pressure was previously set low
* Compressor is due for rebuild

But at any rate, compressor pumped up fairly quickly and I'm very happy. Have been without compressed air at home for a while now, good to see light at the end of the tunnel. Thanks for everyone's assistance!

Trey T · Dec 20, 2013

Anybody know where I can get that double groove belt?

A_Pmech · Dec 20, 2013

Trey T said:
Anybody know where I can get that double groove belt?

You don't need a banded belt for an air compressor. Go to your local power transmission supplier and order two matched belts.

:thumbup:

b-body-bob · Dec 20, 2013

DistantHorizon said:
Compressor guy I talked with said it doesn't matter which way it rotates, as it is splash lube

That's curious. I was told to take care that I install the rods in my splash-lubed Champion in so the oil slingers would actually sling oil. They're basically long roll pins, so I faced them with the split facing so it would catch and hold oil as it rotates. Turned the other way it'd only pick up what held on to the outside curve of the slinger. Just posting this so someone doesn't see the comment about splash lubing and take it as gospel.

rustyjames · Dec 20, 2013

71flh said:
I think of the spokes of the compressor pulley as fan blades so as already mentioned, CCW looking at the pulley.

That's what moves air over the cylinder to cool it/them.

Is it me or does the size of the motor pulley seem a bit large?

I agree, that motor pulley does look to big. I have the same pump and running a much smaller pulley.

sberry · Dec 20, 2013

As for belts it used to be common to order matched belts but mfg got so much better I don't think they even do it in common apps like this any more. That's quite a comp. If its got a pressure adj turn it up a pinch.

Quincy 325 - Which way should it rotate?

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