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Gear Rebuilding

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Jim

08-21-2002 21:09:49




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While working in a large sawmill we used to send alot of stuff to a machine shop to be rebuilt. One of the items we had rebuilt happened to be gears in gear boxes that drove chains to move lumber.
Has anyone thought or done this for tractor gears such as ring gears? The reason I ask is I am looking at a maybe replacing a ring gear in my Kubota and everyone says the cost $1000. It surely whould not cost that to have one rebuilt.

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Alton

08-22-2002 16:24:42




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 Re: Gear Rebuilding in reply to Jim, 08-21-2002 21:09:49  
First you should try to find out why the gear broke in the first place so it won't happen again.



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Jerry B

08-22-2002 06:29:19




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 Re: Gear Rebuilding in reply to Jim, 08-21-2002 21:09:49  
Well I am no metalurgist or machinist, but I would say that by the time you had the teeth built up, ground or machined back to specs, hardened, stress releived and fitted to the pinion (which will also have to be repaired at the same time)and then supply shims to properly phase them together in the tractor, you are talking about more than the cost of a simple gear replacement set.

Also consider that ring and pinion gears are first manufatured, then they are checked to see how far and by which direction (larger or smaller) they differ from specs. Then the gears are matched to each other using the final dimensions as a reference. When you buy a ring gear and pinion set they come as a MATCHED set, not just 2 gears in a box.

One has to wonder why just the ring gear wore out. I am sure the pinion has a considerable amount of wear as well. If placed against a new ring gear the pinion is going to almost destroy the ring gear in no time.

Have you investigated a used MATCHED set from a junk tractor?

Just my 2 cents worth.

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