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Massey 44 1st gear repair (popping out under load)

4

48farmallH

New User
I have had my 44 pop out of first gear a few times in the last couple years when pulling but when it cost me first place at the last pull I decided enough was enough. Had done some research on the solution but most advice was the spring and ball (which I replaced with a heavier one last year), or just put a bungie cord or load binder on it.

I pulled the transmission cover and shift rail cover, removed the shift rail block/holder, and then the 1st/reverse shift rail.

In my opinion there were two problems, wear on the shift rail and the original machine job was too close. After some measurements I came up with .095" left that first gear could still engage while still have .020" left of play.

I welded the 1st/neutral gear slots on the shift rail and then roughed the shaft back in on the lathe, finish ground the od, and milled the slots back in. The 1st gear slot/detent I moved back .060" and increased the depth .015".

Got everything back together last night and it really locks in 1st now!

I will upload some pictures in the parts and peices gallery.
 
When I worked foe an Allis Chalmers dealer, the company hired a mechanic from a Massey dealer in Wisconsin. He addressed the issue od 44's jumping out of low on a long hard pull. according to him a field service supervisor had claimed that the long input shaft was known to flex a bit and the shaft, like a spiral, would thread the sliding gear back and put more strain on the shifting fork. This was a common problem in the Missouri River Hills when pulling moldboard plows.
 

Shoulda just used 2nd. That 44 should have enough chowder to keep the wheels turning at lower speed.
 
(quoted from post at 17:30:09 06/29/17)
Shoulda just used 2nd. That 44 should have enough chowder to keep the wheels turning at lower speed.
Click to expand...

Sorry, doesn't have enough chowder at 6500 lbs. for 2nd gear.
 
(quoted from post at 09:41:25 06/29/17) I have had my 44 pop out of first gear a few times in the last couple years when pulling but when it cost me first place at the last pull I decided enough was enough. Had done some research on the solution but most advice was the spring and ball (which I replaced with a heavier one last year), or just put a bungie cord or load binder on it.

I pulled the transmission cover and shift rail cover, removed the shift rail block/holder, and then the 1st/reverse shift rail.

In my opinion there were two problems, wear on the shift rail and the original machine job was too close. After some measurements I came up with .095" left that first gear could still engage while still have .020" left of play.

I welded the 1st/neutral gear slots on the shift rail and then roughed the shaft back in on the lathe, finish ground the od, and milled the slots back in. The 1st gear slot/detent I moved back .060" and increased the depth .015".

Got everything back together last night and it really locks in 1st now!

I will upload some pictures in the parts and peices gallery.
106.jpg
[/img]
Click to expand...
 
Impressive bit of old school mechanicing there. Normally on Farmalls when they pop out of gear it's a bearing on one of the transmission shafts, so when I went into this thread I was expecting a complete teardown. Glad it was relatively simple.
 
(quoted from post at 17:40:30 06/29/17)
(quoted from post at 17:30:09 06/29/17)
Shoulda just used 2nd. That 44 should have enough chowder to keep the wheels turning at lower speed.
Click to expand...

Sorry, doesn't have enough chowder at 6500 lbs. for 2nd gear.
Click to expand...

Well, there you have it. 44s pull 4000 to 5000. 44-6 pull 4500 to 5500. No wonder.
 
(quoted from post at 06:22:57 06/30/17) If he's placing 1st in the 6500lb class pulling in 1st, I wouldn't knock it.
Click to expand...

Sure, but think of the possibilities in 4,000 to 6,000. Depending on the track of course.
 
Thanks for the info on your repair process, particularly the dimensions and clearance. I've got a 1982 GMC truck with the GM built four speed with the same problem. Maybe some reverse engineering will solve it. unc
 
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