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Odd 8N transmission problem

O

old

Well-known Member
Location
Camdenton Missouri
First off if your going to post an answer that does not help please don't have enough of those down in the Ford forum.
But any how my 8N with a backhoe on it seem to be in gear when out of gear. If you let up on the clutch pedal and you have a rear tire off the ground it will spin up like it is in 4th gear but it is not in gear. I took the top off to make sure it is in fact out of gear and it is. Not really sure what the heck is going on that it is doing this. So is there some bearing or other such thing that maybe locked up that would cause this type of thing to happen??? I have never been into an 8N transmission and the FO-4 manual I have is not clear as to having a bearing that might cause this.
Oh and by the way some of the people did try to help but well a number all they could do was put me down for not knowing what is going on

Thanks
 
Rich, I could not find your other post.
I do know that in the winter especially, I can crank my 52 8N and when it is out of gear, the oil will be thick enough to try to make it creep forward. I assume it is the oil on a shaft or oil slinging from one gear to another one that is very close.
I remember seeing wheels on back hoes spin like that a lot over the years when off the ground with the outriggers down.
Richard
 
My other post is under the same heading but in the Ford forum and I posted it yesterday.
That said this one spins up in such a way if the rear tires are on the ground and the clutch pedal is let up it will try to move the tractor to the point if it cannot do so it will stall the engine. Act like it is stuck in 4th gear but I know it is not since I had to top off to make sure. Also if you do shift it into say 1st or for that matter any gear and let up on the clutch pedal it stalls the engine like it is in 2 gears. So all I can think is going on is some how the input shaft and out put shaft have some how locked up with each other.
 
I could not find your other post either.If I under stand correctly-the clutch is releasing,and it tries to move as if it is in 4th/high gear when you release the clutch.Was this tractor under water when you got flooded?And it sets a lot of the time? I would bet the mainshaft pilot bearing inside the transmission is seized inside the rear of the input shaft.This would cause the transmission to be locked in direct drive(high gear!)-if an 8n tranny is like any other tranny that I have worked on.Good luck,Mark.
 
I am gonna guess that 4th gear has galled itself to countershaft. Key # 24 on messicks site. This shaft is in bottom of trans and requires double spilt.
 
Old no 8n or tranny expert but other than your bearing idea a bent shaft,stuck gear, even clutch issues.
 
I know it is not a clutch problem since when I run the backhoe and keep the pedal locked down all is well. But let he clutch pedal up and it is like it is in gear but it is not in gear that has been checked. But if it is like the 2N transmission there is in fact a bearing between the input shaft and out put shaft which is it is locked up I guess it could do what it is doing. I have 2N transmission and rear end laying around so I just pulled the input shaft and found a bearing between the 2 shafts
 
I'm guessing that you've got internal transmission problems, you say you've had the top cover off and the rails have it in neutral, are the forks moving what they should move or are they broken, bent or worn? Not sure on an 8N but a lot of transmissions high gear is direct drive and the gears on the main shaft engage to send the power down the main shaft, the counter shaft doesn't come into play, well is whatever engages galled, rusted or jammed together? Has something broken and in the process of floating around in the transmission got stuck somewhere that is causing things to stay locked or messed together even when they shouldn't be? If you try to shift it into another gear what happens?
 
Yes it was under water in Dec of 2015. It had been working just fine up till just a few days ago. I did pull the input out of a 2N transmission that I have laying and found the bearing your talking about so yep may be where the problem is and if it is it could be fun to take apart since if it is locked up that tight it could be welded up or close.
Thanks
 
Every thing moves as it should when you shift gears be it 1,2,3,4 or R. Everything moves as it should and not broken parts that i can see. I am think there is a good chance the bearing between the input shaft and out put shaft has rusted up froze up or welded it self up in some way. I plan to that the top off here in a few and try to pry the high gear backwards and see if the engine turns at the same time when I do that. If find it to be a bad bearing this is not going to be fun to split to fix it with the back hoe and loader on it
Thanks

Oh by the way if it is like the 2N transmission there is a bearing between the input and out put shaft I just took the input shaft out of a 2N transmission I have laying around just to see what was there
 
I've rebuilt a lot of truck transmissions,and have seen that happen when they ran low on oil,and ran in lower gears a lot.That bearing is only stationary in direct drive/4th.So if the bearing was rusty,or just failing,and you would normally be using a tractor in lower gears so that bearing has to rotate!Good luck with it!Mark
 
(quoted from post at 22:05:15 05/31/17) I've rebuilt a lot of truck transmissions,and have seen that happen when they ran low on oil,and ran in lower gears a lot.That bearing is only stationary in direct drive/4th.So if the bearing was rusty,or just failing,and you would normally be using a tractor in lower gears so that bearing has to rotate!Good luck with it!Mark
Click to expand...
here is no direct, one to one, in the 8N transmission, not even in the highest 4th gear....still a reduction.
 
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