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641 Ford

M

Metal Man

Member

years ago my ford started shifting hard in 1st and 3rd so I changed the fluid. When I drained it a lot of water came with the oil. It continued shifting hard to the point I couldn't get to shift at all. A day ago had a chance to take the cover off the transmission. The 1st and 3rd shifting rail is covered with rust. I found a spring sticking out of the case under the seat. My
guess this is where the water is getting in. So can someone tell me how I can free op the rail. I've been using liquid wrench
and evapo-rust so far with no help. Also I know there should be a cover over the spring. Any help would be greatly appreciated.
In case anybody wonders the tractor has been stored inside sense I've owned it. And many thanks for any advise.
 
The water might be running down the shift lever, do you have a ( good)rubber boot at the bottom of the shifter ?? Jim in N.M.
 
Shiftier boot is the most likely place water gets in. Pour some ATF on the shifter area and let it soak in most of the tiem that will let things move again
 
Since he said it has been setting inside since he has owned it, which he says is for several years. The water would have had to gotten in before he got it. I doubt that is his problem with water being the boot. I would consider condensation more than leaking around the lever boot. As for the rust I would guess it is not being run enough to keep oil slung up on the rails in the lid.
 


Much more water gets into the transmission or hydraulic hiusings by condensation than by leaks. I can't picture what you mean by a spring under the seat. Before I started running a dehumidifier in my shop I would have puddles of water of condensation under tractors in there a number of times a year. If you have it on the outside it is inside as well.
 
I am not sure how long it sat outside at the implement where I bought the tractor and yes the shifter boot does leak. As far
as the spring goes it holds a detent ball in the shift rail.Looking at the shop manual it looks like there is cap or something
that holds it in but gives no part number. This spring sits in just outside of the edge of transmission cover. Hope this helps.
Thanks guys
 
My 841S got water in the transmission due to a bad shiftier boot due to sitting out side. Had enough in it one winter that it would not start due to ice locking up the transmission
 
Well your question is how to free up the shift rail, not so much how to keep water out. You will need to remove the rail from the housing. I am not familiar with that tractor specifically, but usually you remove the bolt in the shift fork and slide the rail out. In your case you may need to drive it out with a hammer and punch. There may be a welch plug at the end of the rail's travel in it's bore that will drive out also. Do not lose the detent ball and spring. There also could be an inter lock between the shift rails-anther detent ball on the side of the rail in the cover. So do not lose anything. Clean the rail with sand paper and it's bore and reassemble. You should replace the welch plugs with new-NAPA should have them- and reseal with silicone. The detent spring and ball probably are held in with a welch plug also.
If the rails are not located in the top cover but in the case below, then the tractor would possibly need to be split.
Good luck, Mark.
 
I've had good luck using ATF poured on the trouble area or over filling with a mix of UTF and AFT. The bearing between the input and out put shaft of my 8N had froze up and I over filled it with a mix of UTF and ATF and it freed up
 
Gasket is # E5NN7Z307AA - $10.76.
Cap - (Seat) - 747238F - $45.67.

Messics and pretty steep. Hopefully one of the guys here has one they will part with.
 
Have you tried PB Blaster on the rail? For the detent spring, the cover has a slot that protudes out that covers the gasket and that spring. Messicks does have them but it wasnt cheap. 797234 is the spring part number. My NAA wouldnt stay in gear without it. Somehow when I removed the transmission case it fell off. I had to change the fluids in it due to water in the oil. Also, that rail is adjustable as we adjusted the rail on mine as well.
 
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