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John Deere Tractors Discussion Forum
Show Parts for Model:

Re: H main bearings

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Cockbird_Hunter

12-21-2012 06:52:12
12.152.193.133



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Mike:

To remove the pressed-in RH (Blind) main bearing, I have scored & cut through the bearing with a Sawzall metal blade being careful not cutting into the bearing housing.

I sent my rods to Paul's Rod & Bearing (Russ Schworer 816-587-4747) for rebabbitting.

For the mains, I ordered new press in bearings from Sharp's Antique Tractor Works In MO.

I then had my local auto machine shop turn the crank main & rod journals then machine the rod & main bearings to 0.002" > the machined crank rod/main journal dimensions....It's a little tricky with the right hand bearing being blind...

Hope this helps.....Good Luck!

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Mike(NEOhio)

12-21-2012 15:41:56
174.130.234.74



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 Re: H main bearings in reply to Cockbird_Hunter, 12-21-2012 06:52:12  
When you sawed those bushings, did they come out easy or was something else holding them? I'm going to try some heat on the housings and maybe some kroil, but if they're that tight it may not penetrate. I was a tool and die maker for 20 yrs and another nine in tool design, so the machining and fixturing is no problem for me. As far as the babbitting goes, It's not a lost art but rare, and I just want to try my hand at it. I've already made a mandrel for the rods, researched babbitt procedures and contacted the JD historical to get the proper grade of babbitt.

Thanks for the input.

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Cockbird_Hunter

12-21-2012 17:48:10
70.194.129.162



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 Re: H main bearings in reply to Mike(NEOhio), 12-21-2012 15:41:56  
Mike:

It has been a few years now, but I think the RH main bearing cane out easily once cut...I may have made two cuts....I did not have to use heat.

For the con rod bearings, I assume you are working on an H after S/N 21500. Pre 21500 tractors had shell type automotive type bearings & 21500-on tractors had "spun-babbitt" bearings that have adjustable clearance by controlling shims in the rod bolts.

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