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'51 8N in gear but will not move

J

Johnfm43

New User
My dad passed away last year and this was his pride and joy. I was using it at my house today and was pushing brush in reverse when it stopped going. I did pop the clutch while using it at the time it stopped. I am not sure what happened or where I should start working on. My dad knew this tractor like the back of his hand and was the only one to work on it since he bought it 15 years ago.

I can turn a wrench but not sure what I should start with. I have moved it into the shop and started to read on all of the sites that I have found on the internet. I search about 35 pages on this forum and have not seen this same problem mentioned.

It has power and while running I can shift it into gears without the clutch pushed in and it will not move. 4th gear does grind a small amount while I am shifting through the gears.
 
Does the PTO and 3 point still work or are they also dead??? If they are also dead I would bet you messed up the clutch disk and may have ripped the center out of it by popping the clutch. There are other thing you may have done also but that is the most common and you don't want to here the other things LOL
 
couple different things it could be.

Can you engage the pto, and toes it spin when you let the clutch out?

if so, clutch is good, and damage is likely aft of the tranny, perhaps inthe splined tube from the trans to the pinion.. or the pinion itself.. or event he ring gear.. originally they were rivited on.. but it's common to shear the rivits and go in with bolts,

if the pto won't spin, then it's poossible the clutch has failed.. like hub ripped out.. etc..

pull trans fill cap, put tractor in gear, and peer into trans with flashlight while setting in seat, let clutch out... see any movement in trans? no? look in front of trans.. yes? look aft of trans.. by pulling dipstick round inspection cover and looking up at pinion coupler shaft.

post back what you find.

soundguy
 
John......alotta 8N's have the popular "Sherman" aux tranny shifter lever over yer left toe. It has a "neutral" position and guess what? Iff'n you accidentally kicked it into neutral, yer tractor won't go, yer PTO won't turn, and yer hydraulic lift won't lift, and you can shift yer 4-speed tranny without grinding enny gears. Simple, eh?

Otherwize ya done sheered yer clutch-hub by poppin yer clutch pedal. This is a doubtful failure 'cuz tractor clutches are overbuilt tuff. And will require a tractor split.

The last failure is the hollow coupling tube between the tranny and the diffy. Yer PTO and hydraulic's will operate. .......Dell
 

Ok. Thanks for the advice. I did go out and start it and opened up the Gearbox filler cap. I looked down in with a flash light and the gears were turning. The PTO works just fine. I had read about the "Sherman" aux tranny and that was the first thing that I check out.

From reading your guys ideas and advice it seems that I have sheered the hollow coupling tube between the tranmission and the differential. If this is the case how do I go about trying to inspect this and change it if it is what is broken. Also where might I get the parts for this change.

Should I still pull the dipstick round inspection cover and look at pinion coupler shaft. If so what should it look like and should it be moving when it is running in gear. I am assuming that it is on the right side below the seat when sitting on the seat? Correct?
 
John.......the hollow pinion coupler shaft is about the size of a toilet paper tube. You can see it inside by removing the hydro-tranny 6"-round dipstick plate.

It should be intuitively obvious that you must split yer diffy to gitt to the hollow tube driveshaft.

One check you should make BEFORE splitting, (tranny in neutral) is jack-up yer diffy so both wheels are off'n the ground and try to rotate ether ag-bar tire either direction (CS or CCW) Iff'n they counter rotate (they should) then drop one ag-bar onto the ground and try to rotate. Iff'n NO rotate, then suspect yer ring'n'pinion gears. Iff'n rotates, then suspect yer hollow drive tube. .......Dell
 
r5206.jpg
is this the dipstick inspection window?[/img]
 
before I pull the Dipstick inspection hole. I jacked it up and spun the tires. They both spin independently. I spun one and the other one started to spin a little. I had my wife spin one while I put my hand on the other one. It did not have any pressure on it. It stayed put and did not spin at all. We did the same with the other and again there was no movement.

suggestions?
 
Ok. So I pulled the dipstick window and here is what I saw.
r5207.jpg

Where would I get the part and how do I go about pulling it apart in order to fix it. The pictures I took inside show bolts on both sides, forward and Aft.
Any help would be greatly appreciated.
 
I have several of those couplers around. I'll send you one for 20 bucks and I'll pay the shipping.

jim
 
The pic experts will be right along to help you on that. I've barely mastered being able to attach a photo to e-mail.

Contact me off the board so we can swap info and get you your coupler.

jim
 
I am looking for the parts number and where to purchase the gaskets for this repair. I am also looking for any tricks in splitting the unit in half. I am going to my parents to try and find the repair manuel that my father had. But, any tips and tricks would be appreciated.
 
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