Hey everybody. First post here on the forum. I have an Allis Chalmers 5050 that's in pretty rough shape that I'm trying to get working. Only thing left that's giving me major trouble is the 3 point hitch lift. When I got the tractor, the arms wouldn't lift at all. I knew there was some pretty bad water intrusion in the oil, so I changed that and the filter. That didn't make an difference. I pulled the spring located under a large bolt under the seat that I have read can cause problems, which is the control valve spring I believe. After pulling that and cleaning it up, I was able to get the lift to move up and down, but not with any resistance at all. Even me holding pressure by hand against the lift arms kept them from raising up. Once the arms were up I could apply as much force as I wanted and they wouldn't budge. I figured I still had some water in the oil, so I drained again, and there was in fact a ton of water still there. After some research I decided to flush with diesel to try and get the water out. I did that, then refilled with oil, and it's the same as before. It will lift, just not with any weight. I have one hose disconnected right now that leads to the auxiliary ports so I could visually check flow, and if I engage that, fluid flows out but not with a ton of force. As in, it shoots oil out maybe 6 inches and that's it. I'm at a loss as to what to try next. My thought is that the pump is shot, but I don't want to keep guessing at things and getting nowhere. Any help and suggestions would be greatly appreciated!!!
Help Troubleshooting 3 point lift
- Thread starter jraffini
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jenkinsph
Super Star Member
Do you have a test gauge to check the hydraulic pressure with? That is where I would start. Hook up a test gauge to the aux. port you mentioned and see how much pressure you have.
All this water may have ruined the pump. The oil floats on top of the water so the water is the first thing the hydraulic pump is sucking up. Doesn't take much running time to ruin the pump this way.
All this water may have ruined the pump. The oil floats on top of the water so the water is the first thing the hydraulic pump is sucking up. Doesn't take much running time to ruin the pump this way.
jenkinsph
Super Star Member
If the pump is bad I did a little looking and you may be able to replace it with an after market pump for reasonable money.
ovrszd
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A pressure gauge isn't something you will use often. Only when you have some sort of hydraulic problem. But I think pressure is what you need to verify next.
Does the tractor have a loader? How about rear remote hydraulic connectors? What I'm looking for is another hydraulic function to check. One hydraulic pump provides pressure for the loader, rear remote connectors and 3pt.
Once you can verify there's pressure or lack of it then you can move on to the next likely source of the problem.
Oh, an open port won't create a spewing mess. It will just flow at the rated capacity of the pump. In your case that's probably somewhere around 12 gallons per minute. It only creates a spew when it's choked down and starts building pressure.
Low pump pressure would certainly create the problem you are encountering. But other things will as well.
If lift the arms as you described and then add a load, hang some weight on them, then leave it overnight and they are still up that would indicate the lift cylinder is somewhat intact as well as the control valve.
My Brother bought a 5050 new. He used the snot out of that tractor. It spent hundreds if not thousands of hours running at PTO speed running a feed grinder. Very good tractors!!!
Welcome to TBN!!! Is that Belton Missouri??
Does the tractor have a loader? How about rear remote hydraulic connectors? What I'm looking for is another hydraulic function to check. One hydraulic pump provides pressure for the loader, rear remote connectors and 3pt.
Once you can verify there's pressure or lack of it then you can move on to the next likely source of the problem.
Oh, an open port won't create a spewing mess. It will just flow at the rated capacity of the pump. In your case that's probably somewhere around 12 gallons per minute. It only creates a spew when it's choked down and starts building pressure.
Low pump pressure would certainly create the problem you are encountering. But other things will as well.
If lift the arms as you described and then add a load, hang some weight on them, then leave it overnight and they are still up that would indicate the lift cylinder is somewhat intact as well as the control valve.
My Brother bought a 5050 new. He used the snot out of that tractor. It spent hundreds if not thousands of hours running at PTO speed running a feed grinder. Very good tractors!!!
Welcome to TBN!!! Is that Belton Missouri??
Thanks for the reply! It's actually Belton South Carolina. Good to hear it's a good tractor. I'm getting to that point now where I'm debating baling out of this tractor and putting the money towards anything that fully functions. The tractor does have a loader, but I have it pulled off right now because I found a huge crack in one of the cylinders and don't want to spend money fixing that until the tractor itself is working. It's actually driven off a different pump. The 5050 has a sort of auxiliary drive connection above the pto that has a dedicated pump on it for the loader. One of these days I'll put the money into getting that thing going. I got it for $2500, so with it being a running driving diesel tractor with 50hp and a loader (albeit broken) I figured I'd jump in and see what happens.
ovrszd
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Rusty brain cells. Forgot that's how they ran the loader.
Unless you have a friend with a gauge looks like you are going to have to invest in one along with the necessary fittings. Needs to be at least a 3000psi gauge. Tractor probably functions somewhere around 2500psi.
I'd stand away from the shrapnel zone when I first cranked it up just in case.
Unless you have a friend with a gauge looks like you are going to have to invest in one along with the necessary fittings. Needs to be at least a 3000psi gauge. Tractor probably functions somewhere around 2500psi.
I'd stand away from the shrapnel zone when I first cranked it up just in case.
Ok, I finally got a gauge on it. It reads about 1500psi at idle and around 2500psi if I give it some throttle. That tells me the pump is good, correct? If the pump is good, what other things should I look at? The port that I was testing at is for the remote hookups. That would seem to point to something in the three point control setup specifically. Any kind of direction would help a ton! The only other thing I saw in the manual that I thought it might be was the pressure relief valve. Any thoughts on that? Thanks!!