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John Deere Tractors Discussion Forum
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730 ring gear reversal?

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Alan Wichmann

06-22-2005 19:08:42




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I'm helping a friend with starter and ring gear problems on a 730 (gas). We put in rebuilt starter only to find the ring gear chewed up. We were successful removing flywheel and then ring gear. We were hoping to just flip the ring gear and re-install. The ring gear looks like it can't be reversed as it has machined "cuts" near each tooth on the damaged side. The undamaged side is cut pretty square.

Can we reverse this gear or is it time for a new one? and if we can put it back on, can we do it by heating the ring? (even if we gently tapped the ring off with a hammer and punch) Someone told me if we pounded the ring off we could not re-install as the temper was now out of the metal in the ring. ???

Thanks

Alan Wichmann
NE Wisconsin

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Adrian830dude

06-30-2005 20:46:08




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 Re: 730 ring gear reversal? in reply to Alan Wichmann, 06-22-2005 19:08:42  
Alan,

Drive the ring gear off using a hammer and broad faced punch (for more surface area). Rotate the gear exactly 1/4 of a turn. Using a acetelene torch heat around the gear evenly being careful not to "blue" the gear. Do this with the gear resting on the flywheel (steel gear heats up much faster than the heavy cast flywheel). Keep the gear level as it expands. It should drop on at about 350 to 450 degrees. Once it drops on use a hammer and punch to make sure the gear is seated firmly against the flywheel. Reinstall flywheel on engine and you're set.

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720Deere

06-23-2005 06:06:30




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 Re: 730 ring gear reversal? in reply to Alan Wichmann, 06-22-2005 19:08:42  
You've gotten good advice. I will add only one thing. You may try heating the ring gear in the oven to about 300 degrees. Make sure you do this when the wife isn't around! LOL! It's a little easier to evenly heat this way and you won't risk overheating and distorting portions of the ring as the oven is slow even heat.



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Ben.So.Wiatrek

06-23-2005 04:58:41




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 Re: 730 ring gear reversal? in reply to Alan Wichmann, 06-22-2005 19:08:42  
Do it like DW posted..I had the same problem also with my 730LP. Took ring gear off and moved it over about 10 inches, works good for me. Good luck Ben.



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BushogPapa

06-22-2005 19:32:49




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 Re: 730 ring gear reversal? in reply to Alan Wichmann, 06-22-2005 19:08:42  
Generally, you can just re-install the ring gear turned 180 degrees from the original position, as the 2-cylinder engines tend to stop in the same position every time.. Heat the ring gear to about 350-400 degrees with a torch...a Blow-torch works fine, but a small propane torch Won't get the job done..!! NOT red hot... Hold it with Vise-grip pliers...set it on the flywheel, and tap it into place before it cools.. You can use the other side of the gear, but you need to chamfer each tooth for the starter gear to engage.. Once you have done it, it is not a big job...

Ron..

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DW

06-22-2005 19:24:45




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 Re: 730 ring gear reversal? in reply to Alan Wichmann, 06-22-2005 19:08:42  
I would think that if you turn the ring gear slightly, so that the bad spot isn't always at the bendix, you should be OK. When I took the ring gear off of my 720 D I drove it off with a hammer and punch. I then heated thi ring gear slightly with the torch, and slid it on the new "Taper-lock" flywheel and let her cool. No problems as of yet.



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