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New Holland S8 Hydro fluid question


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#1 BMW1 OFFLINE  

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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?

 

Thanks.

 



#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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#4 BMW1 OFFLINE  

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Posted May 25, 2017 - 12:13 PM

Just getting back to this project.  The operators manual for a New Holland S8 indicates the hydro transmission fluid in it "does not need to be changed". 

 

I'm not sure they considered the fact the tractor may be around and operating 44 years later.

 

Reading things on the internet it sounds like the color of automatic transmission fluid can change over time.  I have no idea what the previous owner did with it or how they treated it.

 

As indicated in my earlier post, the fluid in the tractor is very dark.  The manual states type "A" transmission fluid.

 

Is there an easy way to tell if the current fluid is  type "A" transmission fluid or if someone replaced it with oil, such as 10w-30.  I live in Minnesota and don't plan on using this in the winter - light mowing duties possibly.  More of a restoration project.

 

What do others recommend I do?

 

Thanks for the help and suggestions.



#5 dtsh ONLINE  

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Posted May 25, 2017 - 12:23 PM

I would err on the side of replacing it with whatever you decide is an appropriate substitute; if for no other reason than knowing that if you need to top it off you'll know what kind of oil to add. I can't think of any oil which would be "very dark", perhaps my image of "very dark" differs from yours, but who knows what was dumped in there over the years. Depending on how dirty it looks and how far you plan on going with the restore, I'd consider waiting until cracking open the hydraulics to make the decision, but I don't think I'd keep mystery oil myself.


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#6 TractorA OFFLINE  

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Posted May 30, 2017 - 04:13 PM

Yes as already said the manual for the s-16 says to use 10w30. I didn't see a model year listed for yours but I would think the same is recommended by the manual for yours?
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#7 TractorA OFFLINE  

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Posted May 30, 2017 - 04:16 PM

Oops I spoke to fast, I see your is a '73. Now realizing this, does yours have a Vickers hydro? As opposed to the Sundstrand hydro units that were produced in later years, this alone may make a difference in what fluid to run?
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#8 BMW1 OFFLINE  

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Posted May 31, 2017 - 11:19 AM

I think it has a vickers but I have not looked for a tag yet.  I dipped my finger in the fluid and it looks to me like it has more of a reddish hue to it so I think it's ATF, which is what the manual for the S8 says it should have.

 

A friend also told me that I should put some grease on my hand then take some of the fluid and rub it into the grease.  He said ATF would remove or cleanup the grease but oil will not do as good of job.  Have not tried that yet.






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