Old combine Hydrolics 101

Posted by Arnie on February 14, 2003 at 21:17:22 from (12.166.18.137):

This may be the wrong forum but here goes. I have and old M, a 47 I think. I was given a loader. A trip bucket, a Freeman I think. It was originaly made for something like an 8n sized tractor so in some ways it was a bit short. Nonetheless, in the spirit of tinkering we've managed to get it mounted.
My problem was/is the hydrolic system. Not having a live pump, we've fitted one from a junked out combine to the side and ran it from the fan belt. The combine was red so I figure is was either an Int. or a Massey. Those are the only red combines I'm aware of. I'm guessing a late 60's early 70's model. Since I got nearly everything cheap if not free I also decided to take the steering axle from the combine. Thinking this would serve as a wide front end. A handy addition to a loader tactor. (Most of the time). We also have the valve body from inside the cab. Pretty much the whole original system.
Here's the problem. The combine had a hydrolic steering mechanism. The pitman arm merely activates a valve on the steering cylinder. This cylinder has it's own port coming directly from the pump. As near as we can deduce this line moves fluid all time (valve in neutral). When the steeing valve is activated (left or right) it uses the exsisting flow, as opposed to a dead head type valve. Hence the other hose from the cylinder goes straight to the resevour. Thats how it was plumbed on the combine.
The pump is strong. At first we decided to cap off the steering hose just to run the loader. In just a few turns off the pump it blew the steering hose apart. There was no output to the the larger main line that supplied the valve body from the cab.
Thinking a valve was stuck inside the pump we took it a part and found nothing obviously wrong. No dirt, no broken springs. All the moving parts seem free.
What could be wrong here? Does it need the steering cylinder to complete the system. That didn't make sence to me.
Furthermore, In trying to get the loader working, we remove the valve from the pump allowing it to pump out both ports with the steering ports being blocked off. Now all fluid is going to the valve body. We were fucntional so far.
After bleeding the system, we can raise the loader (one way cylinders). But what we thought was a two way valve to operate the bucket (we added a cylinder) won't funtion like a two way valve. As one side pumps the other should release. It doesn't.
So what did we do wrong. As near as we can tell it's plumbed just like it was on the combine but it's not working.
Any ideas?
If it will help I can send photos.
Arnie

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• Re: Old combine Hydrolics 101 DHuth2 21:07:38 02/17/03 (0)

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