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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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trans/diff oil

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duane o.

12-20-2012 19:24:03

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We are getting ready to put fresh oil in both s99 and 990 trans and diffs. The books say 10-30 engine oil with high presure additive. What is todays oil choice to use for these tractors as the additive is obsolite or unheard of? Any help is greatly appreciated. Duane

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12-21-2012 17:50:18

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 Re: trans/diff oil in reply to duane o., 12-20-2012 19:24:03  
If you use to light of an oil you will have trouble with the pinion seals leaking especially on the 99. 80w90 is fine, but you may want to consider something heavier like 90w140
This post was edited by gordey at 17:53:57 12/21/12.

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12-21-2012 17:47:21

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 Re: trans/diff oil in reply to duane o., 12-20-2012 19:24:03  
my guess it sounds like it could be comparable to hydraulic oil like all the newer tractors use in trans/rearends. Most hyd oil is in that viscosity range and is be able to withstand pressure.

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larry duda

12-21-2012 03:53:50

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 Re: trans/diff oil in reply to duane o., 12-20-2012 19:24:03  
I use 80/90wt. gear oil in my 990. Larry

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