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Repairing differential pinion shaft threads?


 
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Armymutt
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PostPosted: Sat Apr 13, 2019 6:53 pm    Post subject: Repairing differential pinion shaft threads? Reply to specific post Reply with quote


 
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Armymutt
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PostPosted: Sat Apr 13, 2019 6:55 pm    Post subject: Re: Repairing differential pinion shaft threads? Reply to specific post Reply with quote

I've narrowed down the issue with my 135. I still can't get the pinion out, but I think I can reassemble it in the tractor. I got a new lock nut and tried to thread it onto the shaft tonight. It won't go because the threads at the front of the shaft are damaged slightly. I'm thinking of trying to use a thread file to repair them. If I can get it to thread on, then my next difficulty is setting the right pre-load. The manual shows this being accomplished outside the tractor and I'm not exactly clear on the tools being used. I found this thread showing the use of a c-spanner with a hole 3" from the pinion shaft to set the pre-load.
https://forums.yesterdaystractors.com/viewtopic.php?t=1321995&postdays=0&postorder=asc&highlight=differential+pinion+reassembly&start=0
I think this could be done since the shaft won't turn when the wheels are on the ground.

If this doesn't work, then is the only other way to remove the pinion involve pulling the left trumpet housing and pulling the ring gear?
 
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John Deere D
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PostPosted: Sat Apr 13, 2019 8:40 pm    Post subject: Re: Repairing differential pinion shaft threads? Reply to specific post Reply with quote

As you may have noticed, the information you located was for my MF FE 35 X........and yes it worked with the pinion installed in place:

I would hope some of the MF Guys with MF 135 experience will comment on your 135.......

Bob....



 
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Armymutt
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PostPosted: Sun Apr 14, 2019 3:35 am    Post subject: Re: Repairing differential pinion shaft threads? Reply to specific post Reply with quote

One big difference I'm seeing is that yours calls for 6-8 in-lb while my manual calls for 20 in-lb. I could probably do the same thing, but applying 6 2/3 lb of pressure with a spring scale, which I don't have laying around. About the closest device I have is a pocket fish scale.
 
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John Deere D
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PostPosted: Sun Apr 14, 2019 5:50 pm    Post subject: Re: Repairing differential pinion shaft threads? Reply to specific post Reply with quote

When I set the Torque on my MF FE 35 X I MADE SURE the NUT ran up by had (two fingers) freely! No resistance at all.

I had a length of pipe bored, and four pieces of KEY STOCK spot welded to the I/D of the pipe. (holes drill through pipe to allow for welding of key stock)

A plate was welded to the opposite end of the pipe with a 3/8 drive . I then used a 3/8" drive torque wrench....not the CLICK/SNAP style but rather the DIAL
TYPE:

There was NO HYD. pump installed when the Torque / pre load was set:

Others may have preformed this task differently than I:

Bob...
 
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PostPosted: Tue Apr 16, 2019 8:57 am    Post subject: Re: Repairing differential pinion shaft threads? Reply to specific post Reply with quote

I was able to clean the threads up with the file. After an initial hard start, the nut threaded on relatively easily. I use a fork seal tool for an old Triumph to tighten it up. I think I over torqued it though, was thinking 20 ft lb vs in lb. I'll have to correct that before I put the cover back on. I don't have the ability to make the tool you describe, but I can put my torque wrench in a vice and use it to get a feel for the right amount of pressure. It should get me close to the "slight drag" mentioned in your manual.
 
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