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Tractor Pulling Discussion Forum

JD G Main Case

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Jerry Patton

10-27-2003 18:38:47




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I have a 38 John Dere G puller that broke the crank this summer. As we tore it down for repairs, we noticed the main case was cracked in two places. My question is this: Will a styled main case work with the rest of the unstyled tractor. I know the parts manual shows different casting numbers but has anyone tried this?

Thanks
Jerry




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Bryan

10-28-2003 04:39:14




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 Re: JD G Main Case in reply to Jerry Patton, 10-27-2003 18:38:47  
Yes, You can bolt a S/G main case to a US/G frame and block. Who did your crank stroking? How did it break?



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Jerry Patton

10-28-2003 15:18:31




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 Re: Re: JD G Main Case in reply to Bryan, 10-28-2003 04:39:14  
Bryan,
Thanks for the response. I know changing he case will be a big task. I've never been into a trans before. Any advice?

I don't know who did the crank. It was done when I got the tractor. 9.25 inch. I will try to see if there is any marking that might indicate who stroked it. It broke right at the inboard end of the rod journal on the clutch side.



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G-MAN

10-29-2003 07:54:05




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 Re: Re: Re: JD G Main Case in reply to Jerry Patton, 10-28-2003 15:18:31  
So it broke right on the edge of the journal, where it meets the crank "arm"? Sounds like maybe it didn't get properly radiused at the edge of the journal. If it's a sharp edge, instead of a smooth fillet, you can get a stress riser, leading to cracks and breaks. I don't have experience with stroker cranks, but I've seen a few ground, stock cranks do that.



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Jerry

10-29-2003 17:52:06




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 Re: Re: Re: Re: JD G Main Case in reply to G-MAN, 10-29-2003 07:54:05  
G-Man,
Yes it broke right at the end of the journal but not on the journal. There is enough meat to keep he rod in place so it didn't break on the machined area but rather just toward the center of the crank. It almost looks as if there wasn't enough metal there to hold it together after stroking. I guess it lasted 5 years. Maybe more because I am not sure how long the previous owner had it together.

Thanks

Jerry

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Bryan

10-29-2003 04:54:43




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 Re: Re: Re: JD G Main Case in reply to Jerry Patton, 10-28-2003 15:18:31  
I've rebuilt 5 JD G transmissions, I like that kind of work, start installing the pto gears at the bottom and work your way to the top. A parts book or a ITT manual does help out. The shifter shafts and forks always get me confused. I finally took some pictures of the S/G and US/G shifter shafts installed in the case. Set the inplay on the shafts to .003-.005 Any questions let me know. Where are you located?

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Jerry

10-29-2003 17:46:07




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 Re: Re: Re: Re: JD G Main Case in reply to Bryan , 10-29-2003 04:54:43  
Bryan,
I may be biting off more than I can chew on this deal. I guess if I had the transmission in place on the styled case I could leave it in there and just bolt the case onto the unstyled rear end and re-assemble the motor? I have located an unstyled case with the transmission removed so if I go that way, I will have to move everything over from the broken case.

I am located in the Kansas City area. Tractor is currently just north of St. Joseph Mo.

Thanks
Jerry

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G-MAN

10-27-2003 19:17:44




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 Re: JD G Main Case in reply to Jerry Patton, 10-27-2003 18:38:47  
Jerry, where are the cracks and how big are they? There is a heck of a bunch of meat in a "G" main case, and they will survive a bunch of abuse. I have a friend that bought a "GM" that had thrown a rod to build into a puller. They welded all the assorted pieces back into the top of the case over the crank, then decided to go bigger with it, and knocked it all back out. He made an aluminum cover to go over the top of the main case, and it has held for years at 700 cubic inches. I would investigate welding your main case before committing to replacing it. Depending on the where the cracks are, it might even live forever just like it is.

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Jerry Patton

10-27-2003 19:48:57




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 Re: Re: JD G Main Case in reply to G-MAN, 10-27-2003 19:17:44  
G-MAN
Thanks for the reply. One of the cracks is across the bottom along the oil pump/filter. I am not sure where the other is. The tractor is at a friends house and he is the one that found the crack but he is not home tonight. The reason I was asking about the styled case is I have one already stripped out of a tractor that was salvaged out. If it will work, it would be easier than convincing my welding shop to work on the broken one.

Thanks

ps. That probably explains why oil was all over the bottom of the main case. Couldn't seem to keep it clean. Maybe the crack was there before the crankshaft broke.

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