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New Holland S8 Hydro fluid question

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Posted September 12, 2016 - 12:57 PM

My son and I recently acquired a New Holland S8 and have got it started and it does drive.


We are wondering if we should change the hydro fluid.  The tractor is from 1973.  No idea if it has ever been changed and previous owner knew very little about tractor.  The engine had been changed from an 8 to 11hp and they were unaware it should've had an 8hp.


The hydro fluid is very dark and looks more like oil.  The Ariens S8 manual states Type "A" transmission fluid and I always thought transmission fluid was red.  The internet basically indicates type "A" no longer exists.  I am wondering if someone at some point replaced with 10W-30 or some other grade of oil.


Anyway, since the tractor does drive, should I leave alone or change the fluid?

If I change the fluid - what should I use?




#2 olcowhand ONLINE  


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Posted September 12, 2016 - 01:05 PM

I would definitely change the oil.  You can use Dexron III trans oil, but for older worn hydro's, many times they perform better using a motor oil instead.  A straight 30wt oil is best.  Does it have a hydro oil filter?  If so, do change it also.  The 11hp engine will be fine & won't harm the hydro.

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#3 Gillis.jim OFFLINE  

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Posted September 12, 2016 - 01:19 PM

The manual for my s-16 says to use 10w30 for the hydro
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