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Farmall & IHC Tractors Discussion Forum
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Re: Differential tooth pattern-not sure what to do

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rustred

01-29-2013 07:37:39
69.58.16.5



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you need to get a picture of the pattern on the crown gear. the crown side of gear, thats forward rotation.




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rustred

01-29-2013 07:50:31
69.58.16.5



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 Re: Differential tooth pattern-not sure what to do in reply to rustred, 01-29-2013 07:37:39  
is that the original crown and pinion? or are you putting a different one in? should have checked the backlash and noted it before disassembly if thats what you did? also keep shims in order from side to side. once a used diff is worn in it should be kept as same spec. changing the pattern will result in gear howling.



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D Slater

01-29-2013 09:33:17
184.15.43.165



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 Re: Differential tooth pattern-not sure what to do in reply to rustred, 01-29-2013 07:50:31  
Sent Zach a ring and pinion and what the backlash was when removed. It had the rear bearing and shims on the pinion shaft that was there when removed. Like TV said the housings could be machined a little different, even the housings that support the differential. Engine was freeze cracked, so I never drove it. Ever since I put a ring and pinion in my first car out of the army and got it wrong I always worry when I do it. After a lot of success and a couple of failures (noise) its still not my farvorite job.

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CNKS

01-29-2013 08:14:08
216.144.104.128



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 Re: Differential tooth pattern-not sure what to do in reply to rustred, 01-29-2013 07:50:31  
Replacements, his were obtained from D Slater, I believe with the orignial shims which is the only way to do it. Yes, what you just posted is mostly what I said in the previous thread. My Super A adjustments were simple compared to his tractor. I took mine apart while on the bench, and got tired of several changes, none of which worked. And if I had have gotten the correct backlash, due to the new pattern it wouldn't have worked anyway, I didn't realize that until a similar thread came up on this site.

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rustred

01-29-2013 08:25:05
69.58.16.5



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 Re: Differential tooth pattern-not sure what to do in reply to CNKS, 01-29-2013 08:14:08  
ok, i see. they sure are a pain to get used ones set up. best to get the picture of crown pattern posted and go from there.



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Zachary Hoyt

01-29-2013 08:42:12
50.122.169.86



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 Re: Differential tooth pattern-not sure what to do in reply to rustred, 01-29-2013 08:25:05  

I tried checking the pattern with the prussian blue on the ring gear teeth and they were meshing on the outer half of the teeth. My book said to put the prussian blue on the pinion teeth, which is why I had done it that way the first time.

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rustred

01-29-2013 10:08:31
69.58.16.5



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 Re: Differential tooth pattern-not sure what to do in reply to Zachary Hoyt, 01-29-2013 08:42:12  
kinda looks like your not that far out. i would wipe the pinion clean from blueing and just coat the crown gear lightly and try it again. rock the crown gear back and forth , where the blueing is removed that would be the contact point. should invest in a dial indicator, would be handy. it is hard to guage thousandth's by feel but after a while you get in the ball park. you want the pattern centred towards the toe of gear ( narrow end) as under load it want to move towards the heel(wider end).
may as well have a better look at things.

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Zachary Hoyt

01-29-2013 15:21:59
50.122.169.86



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 Re: Differential tooth pattern-not sure what to do in reply to rustred, 01-29-2013 10:08:31  
Thanks, I tried it again and then decided I would just put the tractor together and see if it makes noise. I figured that I would be just as likely to mess it up worse by trying to fix it and end up having to tear it down again anyway so I might as well try it this way first.
Zach



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