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cracked transmisson

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Todd L

10-21-2004 18:42:03




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I have a crack on the bottom of the transmisson on my M because of a lift cylinder bypassing when i lifted a bale. The crack is about eight inchae from the axle and about a foot long. What is the best way to weld this thing. I have been thinking of splitting the tractor and rolling the transmisson over to weld. I am not the best at welding overhead. Maybe I could take it to Allan and swap him for his H !! How would you guys fix it? Thanks

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Rod F.

10-22-2004 05:12:36




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 Re: cracked transmisson in reply to Todd L, 10-21-2004 18:42:03  
Hi Todd,
That's a nasty problem you have there. I think if you have access to another housing for a good price, that may be your best route. If you decide to weld, it can certainly be done. That said, the major problem with welding cast is distrotion and the brittleness of the cast. Cast needs to be pre-heated to (I think) 450 F. If you weld cold cast, the quick temp rise, and eventual decrease will simply cause the casting to crack in a new place and a new direction. Generally, something that size would need to be broken down, prepped and placed in an oven to get it up to temp, and then welded in a normal manner. I have had good success using Sodel 35's for most of my cast projects, although I haven't welded any tranny's. You would need to get a good idea of the composition of the transmission, and find the appropiate rod. Mabey some of the others mentioned below are correct. I will tell you for certain, if you can't do the pre-heat, then don't waste your time. It WILL crack again when it cools. My 2c, for what it's worth. Take care.

Rod

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Todd L

10-22-2004 14:41:17




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 Re: cracked transmisson in reply to Rod F., 10-22-2004 05:12:36  
The more I think about this I think you are right to just replace the trany. I know of some Ms setting around I can probably pick up fairly cheap. Also thinking of looking into a 560 or 656 if I can find an affordable one. Thanks



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Oklahomatractorrebuilder

10-21-2004 22:39:26




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 Re: cracked transmisson in reply to Todd L, 10-21-2004 18:42:03  
We have a extra rear case for a M if you would rather just replace it. Will take $200.00 for it. Tim



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Todd L

10-22-2004 05:00:03




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 Re: cracked transmisson in reply to Oklahomatractorrebuilder, 10-21-2004 22:39:26  
I been kicking that idea around too. Thanks for the advice on the welding rod to guys.



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SHeiserman

10-21-2004 20:11:10




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 Re: cracked transmisson in reply to Todd L, 10-21-2004 18:42:03  
I have an old Case with the same problem. I've got it split and was going to turn it over to make welding easier. I was going to try some MG289, made by Messer and available at Praxair. It's an all position, AC or DCEP rod designed for old, oil soaked cast. It's a bit pricey at $60/lb. Never tried it before, was curious to see how it worked. They have a help line at 1-800-558-8524, if you'd like a bit of advice from a Messer rep. If you try it, let me know how it works. Good luck.

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Allan in NE

10-21-2004 18:56:37




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 Re: cracked transmisson in reply to Todd L, 10-21-2004 18:42:03  
Doggone it Todd!,

That's some nasty luck.

I'm not a great welder and the only advise I can offer is that I would suggest you find the ABSOLUTE ends of that crack and drill a couple of small holes to keep it from spreading any further (if you don't, it'll spread even after you weld it).

I hope you get that ol' darlin' fixed,

Allan



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Todd L

10-21-2004 19:05:22




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 Re: cracked transmisson in reply to Allan in NE, 10-21-2004 18:56:37  
Thats agood idea. I think I will fix the cylinder too! Thanks.



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john_bud

10-21-2004 20:30:42




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 Re: cracked transmisson in reply to Todd L, 10-21-2004 19:05:22  
I have some cracks on my Ford from previous owners heavy backhoe work. Bought some rod from these guys: >Link

I>Link also looked into these guys:
Link

They both seem to have the same product and it is very pricy at $110 a pound. But it is supposed to raise the dead, heal the sick and weld cast without cracking! I don't have experience with it yet (taking a welding class to refresh my stick skills), but soon!

The local shops want about $100 to $200 to weld a 8-10" crack, so this isn't such a bad deal if it works...

jb

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