Fading Pumping Issue Quincy 325

by Lee
(Burgaw, N.C. )

Quincy 325 air compressor (Photo: www.yabe.chudov.com/Quincy-325-Compressor/)

Quincy 325 air compressor (Photo: www.yabe.chudov.com/Quincy-325-Compressor/)

I have a older Model 325 2 cylinder piston air compressor. It has given years of good service but recently has started doing something strange. It will come on normally when the pressure goes down, but after pumping for a minute or so, it stops pumping even though it is still turning. It will do this for several sconds (8-10) and will then start pumping again. It will do this until it will eventually pump back up to cut off pressure. I feel like there may be valve sticking but am not sure. I have cut it off until I figure out what is wrong and fix it.

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Hello Lee... given that I'm a bit slow on the uptake, when you say "It will come on normally when the pressure goes down, but after pumping for a minute or so, it stops pumping even though it is still turning." what is still turning?

You might also want to check any belts for proper tension.

Please post a comment here with more info if you can.

Bill

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Jan 31, 2015
Bad Unloader
by: Doug

The hydraulic unloader has gone bad..It's thr brass valve on the right side looking at the pump from the rear

Jan 15, 2013
Fading 325
by: Anonymous

Mr. Bill,

The motor is turning the compressor at the same rate as it was while it is actually pumping, but it is not actually pumping air. The pump pressure gauge will spike, then fall and the pumping will resume without the compressor ever having stopped.
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Are you saying you are seeing a spike and pressure drop in the tank pressure gauge, or are you seeing it on the regulator gauge?

I would remove the intake filter, and feel the intake port - carefully - to see if a pressure variance occurs at the same time that the intake air flow varies.

I'm leaning towards a valve problem here, but not sure.

Bill

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Gilbarco compressor -Quincy pump not maintaining pressure?

by thomas
(Winnsboro SC )

When I removed air filter noticed air leaking thru intake?

I have a Gilbarco compressor that is utilizing a Quincy pump.

I am having trouble maintaining pressure while running tools.

I was told to check the air filter and belt tension and in doing so I removed the air filter (intake).

When I did so I noticed the sound of leaking air and discovered that air is leaking back thru the intake.

What does this signify and could this be a symptom of my problem? If so what is the solution?
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Hi Thomas...
Air coming back out of the intake valve on any air compressor suggests that the intake valve is compromised. Depending on how long it takes for the compressor to refill, if it is quite a bit longer than ordinary, the longer it is the more serious the intake valve problem.

The solution is, of course, to dismantle the pump and replace the valve. It might have a valve plate containing both the intake and pressure valves, or they many be individual valves, I am not sure, not having ever taken a Quincy compressor apart.

In terms of parts, you will have to identify the pump ( a plate or something? ) and then contact Quincy at www.quincycompressor.com to see if they can direct you to parts.

I did a quick search and found some afternmarket sources too, yet you will will need to know the details of the pump to chase down parts.

Cheers,

Bill




Comments for Gilbarco compressor -Quincy pump not maintaining pressure?

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Sep 18, 2014
QUINCY
by: Anonymous

NEEDS OIL IN IT

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Model 216 early 80's stops building at 60psi

by Walt
(Indiana)

Hello, got a model 216 quincy , it's not building pressure sometime and stops at 60psi. It I stop and start it it might build to the switches cut off point. It sounds like its free wheeling so to speak? When it does not build. Really need to get it going fast! Thanks . Walt.

Comments for Model 216 early 80's stops building at 60psi

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Jun 04, 2014
Info 216 single stage
by: old grunt

Ck your oil level & oil press should be above 10# bad hyd unloder , low oil,loose belt, bad Diap on unloader on top.

May 19, 2014
More info model 216
by: Walt

Sorry, well it stops building pressure but but the motor is still running . And now now when it does build enough pressue to trip the pressure switch limit it's sticking .a tap on the switch and it shuts off. Is there anything that can be cleaned in the pressure switch housing? Oh by the way my belts are shot! Cracked and very loose . Thanks , Walt

May 18, 2014
stops?
by: Doug in s.d.ca

Not sure what all stops, but it sounds like you may have a worn and/or loose belt.

Moderate finger pressure on the middle of the belt should move it less than 1/2 inch.


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