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Re: Differential tooth pattern-not sure what to do

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The tractor vet

01-29-2013 08:44:40

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setting up a used ring and pinion can be and is a ral pain in the drain due to differences in machining of the castings , And getting it dead on only happens about 1 in 10,000 times . You may have a high or low drive and a dead on coast pattern or the other way around . Study the OLD pattern and stop and think of what ya need to do to get the pinion set as close as you can to the org. ware pattern and this will take some playen since you do not have the set up tools that were used to get the pinion depth set to start . And with years of shell we say extencive field testing you have ware on all parts . Then here you come and oh these bearings are getting bad so i will just replace the bearing and i will reset backlash well when you did this you changed everything . and you can NOT go by the book here this is where experience comes into play with setting up a rear end . I(F the book calls for .008-.012 backlash that is for a new gear set on new bearings, so you put new bearings on everything but not a new gear set then you should be happy with .016-.025 back lash . better loose then nice and tight .008-.012 as now you pressed the ring gear deeper into the pinion and the tips will be riding on a new surface and only the tips are making tight contact . Be more concerned with a good drive patter or close then a perfect set on both coast and drive Also just because you have the org. shims this does not guaranty a perfect set due to machining of the housings, that is WHY they make shims..

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Zachary Hoyt

01-29-2013 09:02:46

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 Re: Differential tooth pattern-not sure what to do in reply to The tractor vet, 01-29-2013 08:44:40  
Thank you. I do not know what coast means in a gear set, and I do not have a dial indicator so I have to guess about the back lash. The best that I can currently tell from what I have done is that the lower half of the tooth on the pinion is driving the upper half of the tooth on the ring gear. This would seem to me that it could indicate that I should take out a shim and put the pinion further into the rear end case. I am also wondering if moving it further in there would be likely to make it whine or be too tight. I have only done this sort of thing once before and that time I put a used SH pinion with its shims on a used H ring gear and it seemed to work fine, although I did not check anything other than visually and by feel and did not check the mesh. I am not sure whether to just put this together the way it is and see if it works or try to adjust things and maybe get myself into a worse mess.

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01-29-2013 14:50:46

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 Re: Differential tooth pattern-not sure what to do in reply to Zachary Hoyt, 01-29-2013 09:02:46  
Zack, There are two patterns, the "coast" and "drive" pattern. The drive pattern is the pattern on the one side of the gears when the tractor is accelerating. The coast pattern is the pattern on the other side of the gears when the tractor is decelerating, or engine braking.
Best Regards,

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Zachary Hoyt

01-29-2013 15:14:46

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 Re: Differential tooth pattern-not sure what to do in reply to CharlieNJ, 01-29-2013 14:50:46  
Thanks, that makes sense. I always like to learn new terms.

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The tractor vet

01-29-2013 09:53:29

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 Re: Differential tooth pattern-not sure what to do in reply to Zachary Hoyt, 01-29-2013 09:02:46  
Things ya need as far as tools ya need , (1) dial indicator with a magnetic base -, (2) a set of Mic.'s 0-3 inches to start with (3) a set of depth mic.'s . And all can be had vfor not a ton of money as you do not need Starrets . And (4) a dial caliper . And since you are not sure what your doing then see if you can find someone to come over and help. If you were close i would do that.

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Zachary Hoyt

01-29-2013 15:45:53

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 Re: Differential tooth pattern-not sure what to do in reply to The tractor vet, 01-29-2013 09:53:29  
You are right, I do need to get those things some day soon. I do have a dial caliper but none of the others.

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