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John Deere Tractors Discussion Forum
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730 REAR AXLE BEARING REPLACEMENT

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BRYAN KNEEBONE

08-08-2007 10:21:11




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WHAT IS THE IDEAL END PLAY ON THE REAR AXLE FOR A 730 JOHN DEERE GAS TRACTOR? THE BOOK SAYS 1 TO 4 THOUSANDTHS, THEN TIGHTEN TO NEAREST CASTLE. BUT WHEN I DO THIS, IT FELLS TOO TIGHT. THERE IS NO END PLAY. SO WHAT IS THE IDEAL END PLAY AFTER THE COTTER KEY IS PUT IN?

THANKS FOR YOUR HELP.

B. KNEEBONE
JEFFERSON, SD

EMAIL: [email protected]




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Chris in MD

08-08-2007 14:28:58




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 Re: 730 REAR AXLE BEARING REPLACEMENT in reply to BRYAN KNEEBONE, 08-08-2007 10:21:11  
GO the nearest castle. You are bound to get some slack, somewhere, in a few short hours of run time.



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msb

08-08-2007 14:21:53




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 Re: 730 REAR AXLE BEARING REPLACEMENT in reply to BRYAN KNEEBONE, 08-08-2007 10:21:11  
Think about it. As the axle warms up, it grows longer causing the bearings to have more clearance. In the case of a 730, the rear axle housing doesn't grow nearly as fast as the axle itself.Follow the book.Wheel bearings should be adjusted the same way.



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Mike M

08-08-2007 10:40:08




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 Re: 730 REAR AXLE BEARING REPLACEMENT in reply to BRYAN KNEEBONE, 08-08-2007 10:21:11  
Here's my take on that stuff for what it's worth ? They way I see it .001 to .004 play allows it to bang back and forth letting it develop more and more play as time goes on. Just look at the backs of the bearings or the shoulders they go against or on the tranny lower countershaft all the gears get indented some adding up to alot of play.

So I try to go to no free play , but on this old stuff try not to preload it either since they weren't made for preload. Newer tractors are preloaded.

So I'd go ahead and turn it so you can get that cotter pin in with zero play and leave it go as long as it still turns freely. I leave out the outer felts and retainers until I get my bearings set where I want them as those felts will really tighten it up.

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