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post #1 of 17 Old 01-22-2019, 07:50 AM Thread Starter
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Shift Assembly Rod Reversal

MTD Model 31A-611D129



OK, so I'm doing this swap from a Tecumseh 2 pulley to a single pulley Briggs. I have EVERYTHING worked out, then I figured out, and sure enough I over looked something.


The second pulley that drives the wheels, spins in the opposite direction. I can tell the guy reverse is forward and forward is reverse, but that's too easy. I'm looking at this part called the shift rod assembly. See attached picture. This is the part that I'm looking at.



I am thinking that the shift rod assembly for the two pulley system is simply a mirror image of one for the one pulley system. So before I start cutting and welding, can I just buy the one for the single shaft output and will it be just a mirror image of this one?



I want to make this work, because someone told me I couldn't, and I'm stubborn that way.



Suggestions?
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Last edited by jsup; 01-22-2019 at 07:52 AM.
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post #2 of 17 Old 01-22-2019, 08:28 AM
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I need to do this also on a 10/29 MTD if I can't find a replacement Tecumseh 8-10hp engine. Keep us all informed, with step by step PICS! Please.

My understanding you need to do a complete reverse of everything underneath to the other side? If all you need to do is re-weld the shift rod assembly, Great!

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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post #3 of 17 Old 01-22-2019, 08:56 AM Thread Starter
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Originally Posted by JLawrence08648 View Post
I need to do this also on a 10/29 MTD if I can't find a replacement Tecumseh 8-10hp engine. Keep us all informed, with step by step PICS! Please.

My understanding you need to do a complete reverse of everything underneath to the other side? If all you need to do is re-weld the shift rod assembly, Great!

I'm trying to figure it out without destroying the shift rod assembly, since they are NLA. If they were still available, I'd already have cut it. If you have an extra one laying around, I'll give it a shot in the interest of science. It makes perfect sense if I mirror image the shift rod, it should just work, but I have to sit down and draw it out on paper.



I can reverse everything underneath, that's "easy" way out.


Like I said, when someone tells me I can't do something, I make a point of doing just that. So let me know if you, or anyone who reads this, may have one. I'll buy it if you're not a pig about it. Don't ask for $100 it's not gonna happen.
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post #4 of 17 Old 01-22-2019, 09:53 AM Thread Starter
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So I called MTD and ordered a new part. I'm going to rip it out, and get it welded. I have a firend that does all my welding, one thing I never learned was welding.



I'm going to take this out, do the mirror image, and hope it works. I don't see how it won't except that 1 would be the fastest, and 5 would be the slowest, maybe. On paper it looks fine, but I'm like Wyle E. Coyte. Lots of plans, and lots of fails. But sometimes, things just work. We'll see.
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post #5 of 17 Old 01-22-2019, 11:30 AM Thread Starter
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Hey JLawrance, I think I have it figured out, and it seems very simple. Smack yourself in the forehead simple.


I pulled out the shift assembly rod. The pin that sits in the carrier is just pressed in, and not very tightly. I knocked it out with a hammer, turned it around, and put it back in, swinging the arm 180 degrees.



I may have to re-drill the hole at the end of the bar, that holds the shifter rod, not sure yet, but it doesn't look that way, and theoretically, if I'm going a complete 180 I shouldn't have to, anything more or less I may.



I'm not sure what it will do to the fastest gear, since it is so close to the center. But everything else lands where it should, at least on the correct side of the center of the drive pulley.


Now, nothing is done till it's done, but it LOOKS like it should just work. Once I realized how easily that pin came out, the rest was simple.
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post #6 of 17 Old 01-22-2019, 11:30 AM
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This part can be made with a flat piece of steel, rod, jig saw, and of course a welder.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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post #7 of 17 Old 01-22-2019, 11:39 AM
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post #8 of 17 Old 01-22-2019, 11:44 AM Thread Starter
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This part can be made with a flat piece of steel, rod, jig saw, and of course a welder.

Easily. Don't even need rod, just use the old one, this way you know the length is right, the holes are in the right place, and the diameter is correct.
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post #9 of 17 Old 01-22-2019, 11:49 AM Thread Starter
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That is an interesting approach to the direction problem. I don't know what the transmission is on that machine. In the one I'm doing, reversing the pin is just SOOOO easy, and looks like it will work well.
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post #10 of 17 Old 01-22-2019, 11:53 AM
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Reversing the rod seems to work for this guy on YouTube but I don't know him, I know you, waiting to hear back from you. Isn't this a summer project?

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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