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Minneapolis Moline Tractors Discussion Forum

UTU hydraulics

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Bill Becker

11-06-2006 06:39:29

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I hooked up a cylinder to the rock shaft on my UTU and pulled the lever to activate it. The hydraulics are now stuck. I unhooked the linkage, but the control lever at the resevoir won't return to neutral. I think I need to relieve the pressure to get it to return. Is there a way to relieve the pressure without opening up the reservoir?

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T.R.K.

11-09-2006 18:34:31

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Re: UTU hydraulics in reply to Bill Becker, 11-06-2006 06:39:29

Bill,
First off, in normal operation, there should be no hydraulic pressure on that valve unless the cylinder is moving. That is why it has to have the MM cylinder or a cylider with built in check valves to hold a load.

And even now, with the engine off it looks like the pressure would soon equalize.

The way its made inside is there are two spools. The control lever turns a shaft with a gear on it that forces one spool in one direction and the other in the other direction. so when you move the lever from neutral, one spool forces oil from the pump to the cylinder and the other directs oil from the cylinder back to the reservoir. (If you open it up you will see what I am talking about.)
There is a arc-shaped piece in there with 3 detent positions on it-the center is neutral, of course. I am betting that there is something wrong with the detents or it has jumped over the end of the arc.

My only other idea is there is trash in the bores the spools operate in. Those spools are precision fit-make sure you get the correct one back in the hole it came out of.

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ILL John

11-07-2006 16:28:00

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Re: UTU hydraulics in reply to Bill Becker, 11-06-2006 06:39:29

Bill, Didn't realize it was you, sorry for the obvious answer. Is that you in the new Antique Power throwing bundles?

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Bill Becker

11-08-2006 05:50:35

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Re: UTU hydraulics in reply to ILL John, 11-07-2006 16:28:00

That's me.

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Alan K

11-06-2006 22:43:57

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Re: UTU hydraulics in reply to Bill Becker, 11-06-2006 06:39:29

I dont think so...if it did it now it will do it again. That happened on our ZA ...it kind of goes over center with worn parts and doesnt come back.
You may have to take the side cover off the res. to get it back to neutral.

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ILL John

11-06-2006 19:00:59

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Re: UTU hydraulics in reply to Bill Becker, 11-06-2006 06:39:29

Were you using a MM cylinder? The others might not work due to the MM cyl having the Pressure control valve in the cyl. John

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