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Ford Tractors Discussion Forum
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Re: Hydraulic fluid pouring from shifter on 641

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John Smith8N

06-13-2007 18:44:09




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I had the same thing on my 861 a couple of years ago. Amazing how fast a small hole in the pressure tube can drain your hyd reservoir and fill up the transmission. By removing the manifold under the pump you'll expose the front end of both tubes. Splitting the tractor behind the transmission exposes the back end of both tubes. You don't need to disassemble it any further than that. I heard about sleeving the tube but that makes the pressure line awfully small and restricted and puts a lot of pressure on your epoxy seal. Whether you replace it or sleeve it I'd recommend removing it. If you're sleeving it you'll have the tube out on the bench and can get it clean. Just go to the backside of the trans with a flat end punch or piece of round stock that is just under 1/2" and drive the tube out the front side. It's a press fit but only for an inch, then it will pull out freely. I like originality and don't mind a challenge so I chose to replace mine. The tube is basically a piece of steel hydraulic tubing 26.5" long. It has 3 press fit diameters, the front end, back end, and one in the middle. The rest of the tube is in open space. The smallest end (rear)is .485". The center is .495", and the big end is .505". I took a piece of .500" hydraulic tube and made a mandrel just slightly (.008") bigger than the ID of the tube. Then I heated the end of the tube red and pushed the mandrel in to swage the first 1" of the tube slightly oversize. Then it was a simple matter to put the tube in a lathe and turn the swaged portion to .505", turn the center position to .495" for an inch and turn the rest of the tube down to .485". I used the heavy wall tube so it was plenty strong. When it goes back in it slides freely until the last inch when all 3 finished diameters are pressing in at once. You'll have to push a little harder for the last inch (read hammer gently). It's not a bad job. If you've got access to a lathe or have a friend who does, you might consider making a new tube. Doesn't take long to make.

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Ben Van Wagner

06-20-2007 08:14:06




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 Re: Hydraulic fluid pouring from shifter on 641 in reply to John Smith8N, 06-13-2007 18:44:09  
Thanks.. That makes it much easier for me to understand and now I think I see the big picture.



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