Shifter Repair advice solicited

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

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Dale Finch
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Shifter Repair advice solicited

Postby Dale Finch » Tue Apr 02, 2013 9:24 am

My '48 SA transmission got stuck in gear, and when I lifted the shifter off and removed the forks, this is what I found:
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I have a friend who offered to weld onto the end of the SA shifter lever so it can then be ground/milled back down to size. Has anyone done this? Is it effective?

First question, what is the easiest way to remove the small pin that holds the shaft in place without damaging anything? (It's obvious I will damage the paint job!) Also, should I anticipate any difficulty in removing the larger pin inside that this allows access to?
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Next, what are the dimensions for the end of the shifter? Should it be the same as the rest of the "rectangular" portion of the shifter rod?

There's always SOMETHING to work on with these red beasts!! Thanks for your help!

Bob McCarty
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Re: Shifter Repair advice solicited

Postby Bob McCarty » Tue Apr 02, 2013 9:53 am

Dale, to remove the pin, you may need an extra pair of hands. An open end wrench can be used to compress the spring, and then the pin can be driven out with a small punch and hammer. If the pin isn't too tight, you may be able to do it without help, just using the wrench and a small ball pein hammer. I can't help you with the other questions. Don't you have a parts SA?

Bob
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Dale Finch
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Tractors Owned: '55 Cub "Bertha"
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'48 Super A "Bubba"
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Location: NC, Chapel Hill

Re: Shifter Repair advice solicited

Postby Dale Finch » Tue Apr 02, 2013 10:20 am

You are DEFINITELY right about needing another person's help...I tried clamping the spring down (successfully), but then trying to hold the assembly, hold a punch, AND swing a hammer...well, let's just say I came I one hand short!!! :lol:

I do have the "parts" shifter currently sitting on top of the SA transmission to see if that was the only problem, which it seems to be, but it is coyotye ugly!!!!! :shock: Very eroded and pitted (although it IS working). Also, I haven't bothered to remove the forks to compare the shifting end...probably my next step, but wanted to have one working shifter.

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Dale Finch
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Tractors Owned: '55 Cub "Bertha"
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'48 Super A "Bubba"
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Location: NC, Chapel Hill

Re: Shifter Repair advice solicited

Postby Dale Finch » Tue Apr 02, 2013 3:40 pm

Sometimes I feel like a real fool! I looked a tad closer at the assembly, and the small pin doesn't even need to be removed to get the shifter out! The large one is accessable just below the cone-like collar...it goes all the way through the cast transmission cover. I used a punch to remove it, and am now hoping SOMEONE will know the needed dimensions to repair it, if they think it can be done.

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Re: Shifter Repair advice solicited

Postby artc » Wed Apr 03, 2013 12:36 pm

if you clamp the shifter in the vise with the pin up and the spring compressed, then it is easy to remove the pin with a small punch.
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Wakulla Bill
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Re: Shifter Repair advice solicited

Postby Wakulla Bill » Wed Apr 03, 2013 2:03 pm

Dale, I do not believe there would be any problems welding the part and grinding or milling back to shape. I have not seen or done this myself on a tractor, however I used to rebuild VW transmissions and welded many a shift fork and filed back to specs. Never had any comebacks doing this procedure :)
Bill
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Dale Finch
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Tractors Owned: '55 Cub "Bertha"
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'55 Cub "Bailey"
'56 Cub "Boris"
'48 Super A "Bubba"
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Location: NC, Chapel Hill

Re: Shifter Repair advice solicited

Postby Dale Finch » Wed Apr 03, 2013 8:03 pm

Wakulla Bill wrote:...and welded many a shift fork and filed back to specs.


This is my problem, though...I have no specs! I was hoping someone knew if the rectangular end (last 1/2 inch or so) of the shifter had originally been the same dimension of the longer and wider portion of the rectangular area (next 1/2 inch). I guess when I get back after the 12th, I will put the forks on and see how much slop there is. That should give some indication as to how much wear there is. It will be much easier now that the shifter is seperated and I will be able to see the slots. I'll let you know after the 12th.


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