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Hydraulic pump priority port for you hyd experts

F

fixerupper

Well-known Member
Back in the store room I have two open center hydraulic pumps off of 105 Deere combines. I kept them around with the idea of using them for something someday.

Both pumps have two pressure out ports, one is priority to the steering and the other is the regular pressure port for the rest of the hyd functions. If I rig one of these pumps up for a log splitter, for example, only one port is needed, what do I do with the other port, and which one do I use? Do I tee the two together or what? I don't have a project planned for them at this time but when the time comes up I'd like to know what to do to make them work for me. Thanks. Jim
 
You will need to tee the ports together. If I remember correctly that is not a priority port but is actually a separate pump section. I think there are two sections in that pump and one is for the steering only.
 
JD, that explains a few things for me now. When I was still using the 105 I blew the steering hose coming out of the pump twice when I hit the stop with the steering wheel. Blew oil on the exhaust manifold and boy did it make a cloud of smoke. It really got the heart to pumping for sure. After some investigation I found out the relief in the pump was stuck. I never did figure out why there was a relief valve in the pump only for the steering but now I'm beginning to see the light here. That was 20 years ago and to this day I'm still careful about hitting the steering stop when I'm driving a combine. Jim
 
I never have any idea if my observations will help, but here are some thoughts.
AC used simple gear pumps on lots of tractors- 170-180-190,etc. come to mind. I don't know why, but they were all different shapes and sizes. Some had a valve built into one section, some didn't. It's been so long since I was into one I don't remember, but you can tell a lot just by looking at the seams/sections from the outside. From what you describe, and what JDSeller adds, it sounds like you might have pumps very much like what AC used on, for example, the 200 tractor.
 
With that being said about Teeing the 2 together you will find the one section will probably have a relief valve on the end and the other larger section will use a relief valve in the valve bank. Can you post a picture and no doubt this is a Cessna built unit since they ruled the ag market. I think I might have one of those laying in the barn as well. You could also place a scribe line on it to refer to and take it apart and look in there. J.
 
13276.jpg
13277.jpg

J. I think you hit it on the nose. Another idea that popped into my mind is to run the hose from the smaller side of the pump back to reservoir if the pump is used for a single function. Thanks for the the help. Jim
 
I am in agreement with Bob. You have a relief valve and a flow divider. The best thing to do is pull the pump apart and look.
 
J. Schwiebert has it correct. I pulled my old service manual out and looked at the hydraulic circuit. The easiest thing to do is just pull the spool and spring out of the priority valve, Then plug one outlet hole and you should be good to go. Plus the relief valve in the pump would be the system valve then.

The 100 series combines had two separate pumps stacked together in the same housing.
 
I'm not familiar with the machine... but it looks to me like you have a priority valve AND a releif valve on the side.
I'd probably take the whole thing apart and see what's actually in there and how it's plumbed. My inclination... if I only needed one line... I'd probably see if I couldn't just remove the priority spool completly as long as it didn't effect the releif valve... then block one of the ports and use the other one. Short of that, just tee them back together and use it.

Rod
 
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