8N transmission

mfs · Apr 18, 2013

I just replaced second gear both on the top and bottom shafts. The transmission now locks up in reverse only if placed under high torque requirements. It actually kills the engine. Forward is no problem. I disassembled the trans. twice looking for clearance issues, etc. and found nothing. Any ideas?/

Anonymous-0 · Apr 22, 2013

I am not sure, but I believe that I am in the same boat. Just replaced second gear in my friend 8n and now it is doing the same thing. I removed the counter shaft second gear because it was broken, not sure what caused it. Or if it is do to the current problem. I am going to work on it tomorrow, so if I find anything I will let you know. I will also be contacting the local Ford guru.

Hobo,NC · Apr 23, 2013

With out seeing it all I can tell ya is to make sure you do not have a bent shift fork,,, how to tell is to place it in neutral and make sure all the gates in the shift rails line dead nuts up,,, all the shift collars are dead nuts in the middle on the shafts... John Smith has good info on this and his advice would be good as gold...

This is about hanging up in 2 gears its basic info that should be looked at on any trans repair as bent worn parts are hard to see unless you have good parts to compair the shift forks to even then its difficult to see ...

http://www.oldfordtractors.com/2gears.htm

First pix in this post 1&3 shift fork was bent
Reverse and 2/4 shift rail aligned dead nuts
1/3 shift rail forward out of alignment is the issue..

Did you have reverse idler gear out :?:
How does the end of the shifter look (trans end)

Anonymous-0 · Apr 23, 2013

No I did not have the reverse idler out, but someone previously could have. As far as sticking in two gears I am not sure that is the problem, but possible. If I jack the tractor tires off of the ground, and put in reverse, then it does not lock up. It only seams to do it when on the ground backing up. It also doesn't do it right away. I might back up 5-10 feet and then it does it. As my friend is cheap I only replaced the broken gear.

Hobo,NC · Apr 23, 2013

(quoted from post at 19:58:34 04/23/13) No I did not have the reverse idler out, but someone previously could have. As far as sticking in two gears I am not sure that is the problem, but possible. If I jack the tractor tires off of the ground, and put in reverse, then it does not lock up. It only seams to do it when on the ground backing up. It also doesn't do it right away. I might back up 5-10 feet and then it does it. As my friend is cheap I only replaced the broken gear.

hanging up in 2 gears (even if its not cher problem) its basic info that should be looked at on any trans repair as bent worn parts are hard to see unless you have good parts to compare the shift forks to even then its difficult to see . :wink: :wink:

Nutter possible issue...

http://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=nboard&th=157759

http://forums.yesterdaystractors.com/viewtopic.php?t=558794&highlight=reverse

Anonymous-0 · Apr 23, 2013

I agree with you whole heartedly that those things need to be looked at during a transmission rebuild. And it is great infomation to offer. I also appreciate the added links which might also be my problem. I would like to thank you for replying to my question as I was very stumped. Now I have some information on where to look.

mfs · Apr 23, 2013

I'm working on the exact same problem also. When I started with my 8n, all the teeth were missing but 2 on the bottom shaft and 5 teeth were broken on the top gear. The reverse idler gear looked perfect. My tractor will also back up with no problem until you add a load to it, then something catches from time to time. It acts like there are teeth missing or a gear is trying to climb out of it's mesh with its mating gear. Again this only happens in reverse. All gears in the trans look good along with perfect shaft preload, etc. etc. I' stumped!!

Anonymous-0 · Apr 23, 2013

Yep, my only problem is in reverse also. It is very frustrating, because my reverse gear looked good also. What you describe is exactly what my friend's tractor acts like. I did not have time to work on it today but hopefully will soon. I will stay in touch with what I find.

Hobo,NC · Jul 11, 2021

Tho notcher problem this is good info to know.

https://fordtractorcollectors.com/4-speed-transmission-locked-up-stuck-in-two-gears/

8N transmission

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