Differential shimming

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Ian D
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Differential shimming

Postby Ian D » Mon Oct 05, 2015 4:27 pm

Hello
Can anyone direct me to a link or tell me how you guys normally measure the turning resistance of the differential (shimming it up) after fitting new bearings? do you use a spring balance device or something?
I think I may of jumped the gun by putting all the PTO shaft back in first but I did this whilst some shims arrived
Any advice would be greatly appreciated
Regards
Ian

Bob McCarty
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Re: Differential shimming

Postby Bob McCarty » Mon Oct 05, 2015 4:44 pm

Ian, Here's a link to the GSS-1411 Blue Ribbon Service manual section: http://www.cleancomputes.com/Cub/Blue%2 ... ential.htm
I have not personally done this, but I'm sure those that have will chime in with suggestions.

Bob
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we need to think differently."
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Jim Becker
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Re: Differential shimming

Postby Jim Becker » Mon Oct 05, 2015 4:50 pm

Did you just replace bearings/seals and keep all the other original parts? If so, put all the shims and bearing cariers back in the same EXACT position they came out from. This will almost always be the right answer, but check it.

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bob in CT
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Re: Differential shimming

Postby bob in CT » Mon Oct 05, 2015 5:20 pm

Jim has the right answer. Bearings are precision items so what you are actually shimming are case variations. If you use the same case. the same shims in the same position should be OK. That said, I used a fish scale for anglers to measure resistance.

Ian D
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Re: Differential shimming

Postby Ian D » Tue Oct 06, 2015 2:24 am

Thank you very much - it was that rolling torque figure I was looking for - excellent.
I did change both the differential bearings and all the seals, I had intended just putting it back together exactly as it came apart (shim position) however when I was cleaning the shims up on my wire wheel I lost grip of one and it became airbourne! - now finding it should not be such a big task I hear you say! but for the life of me it cannot be found - it must be sitting somewhere or on a ledge in the workshop. I therefore sourced some more shims - hence I just want to make sure the jobs right
Many thanks again for your help and advice - you guys are a credit to tractor circles!
Ian


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