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Ford Tractors Discussion Forum
:

Ring gear replacement on 850

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Dave H (NY)

11-26-2004 11:19:07




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While I have the tractor split I want to change the ring gear since it has some wear on it, I would just like some input from those who have already done it. I read the service manual and I wanted to see how you guys heated the ring gear for installation and how you removed the old one as well. Thanks Dave




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MarkB_MI

11-26-2004 15:57:31




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 Re: Ring gear replacement on 850 in reply to Dave H (NY), 11-26-2004 11:19:07  
Almost any automotive machine shop will replace the ring gear for a reasonable fee.



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Bob

11-26-2004 12:14:03




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 Re: Ring gear replacement on 850 in reply to Dave H (NY), 11-26-2004 11:19:07  
Carefully split the old ring gear with a sharp chisel.

The wife's oven works good for heating the ring gear. I put the flywheel in the freezer a couple of hours before, and then put the ring gear in the oven at 350 to 400 degrees. After 20 minutes or so, get the flywheel out of the freezer, set it on something next to the oven, grab the ring gear out of the oven with oven mitts, and drop it in place on the flywheel, having a brass drift and a hammer at hand, to tap it to be sure it's seated.

Since my wife for some reason frowns upon this process, I now have my own oven in the shop. It works good for pizza, too.

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Dave H (NY)

11-27-2004 10:15:08




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 Re: Ring gear replacement on 850 in reply to Bob, 11-26-2004 12:14:03  
Bob, had some time today so I did the ring gear, what a piece of cake! I used a chisel while the flywheel was still on the engine and hit the ring gear off useing the timing hole as a guide while I spun the crank by hand. It took a few smacks to break it loose then smoothe sailing, put the new ring gear in the wifes oven (got stared at in a bad way) heated it to 400 for about 30 min put it over the clutch again flywheel still on the engine tapped it light to seat it, spun it while hitting it with a drift until I heard it seat and saw no light passing at the seam on the rear of the flywheel to ring gear lip. All in all a very easy job. Thanks for the tip on the oven now if one of the other tractors needs a ring gear I won't even hesitate. Dave

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Bob

11-27-2004 11:27:05




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 Re: Ring gear replacement on 850 in reply to Dave H (NY), 11-27-2004 10:15:08  
Dave,

I'm glad the ring gear change went well for you!

It's just amazing how much a little heat expands the replacement ring gear!

Often, on these boards, people are struggling with ring gear replacement, and are unwilling to try this method. It's good to hear from someone who tried it, and had success.



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john in la

11-27-2004 11:45:29




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 Re: Ring gear replacement on 850 in reply to Bob, 11-27-2004 11:27:05  
Are you trying to say there are people out there that are trying to install ring gear cold.
That would be next to impossible.
I can see why they would dread doing the job.
I have always used a rose bud but I know some do not have the correct tools available some times.
Just heat it up; pick up with a set of pliers and set it on. No tapping required.
I like the oven idea. Will keep that in mind but that would have to be a wife is at Wal-Mart kind of job.

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Bob

11-27-2004 12:03:06




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 Re: Ring gear replacement on 850 in reply to john in la, 11-27-2004 11:45:29  
If you have to send the wife to WalMart while you do the job, it'd probably be a lot cheaper to farm out the job!



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john in la

11-27-2004 12:16:59




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 Re: Ring gear replacement on 850 in reply to Bob, 11-27-2004 12:03:06  
Got to agree



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Bob

11-27-2004 12:56:30




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 Re: Ring gear replacement on 850 in reply to john in la, 11-27-2004 12:16:59  
Oh, well, think of what a boost WallyWorld is to the US economy!



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Dave H (NY)

11-26-2004 13:31:22




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 Re: Ring gear replacement on 850 in reply to Bob, 11-26-2004 12:14:03  
Thanks Bob, I actually was thinking about the house oven for even heating. How about removal of the old one what did you do?



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Bob

11-26-2004 15:13:42




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 Re: Ring gear replacement on 850 in reply to Dave H (NY), 11-26-2004 13:31:22  
Dave,

Did you miss the first line of my post about splitting it with a sharp cold chisel? If you're carefull, you won't as much as nick the flywheel.



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Dave H (NY)

11-27-2004 06:11:32




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 Re: Ring gear replacement on 850 in reply to Bob, 11-26-2004 15:13:42  
Yes, Bob, I actually did miss it, after I posted again and reread your post I saw it. Thanks I will be changing it on Sunday and will post back when done. Thanks again Dave



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