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GT18H tranny oil question


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#1 Firemang OFFLINE  

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Posted January 13, 2017 - 08:22 PM

Drained the tranny oil in the hydrostat on my Ford GT18H the other night as I was changing the filter and it was probably the original oil, aka 30 years old. The manual says to add 6 quarts of SAE 20 back in. After going to 4 different auto parts stores and a Walmart I can't find it anywhere, just SAE 30. I have a couple jugs of John Deere hydro guard I had planned to use that I had used on my LGT 145 but seeing the manual call for SAE 20 made me question that idea. Anybody have any thoughts on what else I could use instead of SAE 20?

#2 Marty'70 OFFLINE  

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Posted January 13, 2017 - 10:07 PM

Found a thread on my tractor and old buzzard posted about being able to get it at Napa.
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#3 Bill2 OFFLINE  

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Posted January 13, 2017 - 11:25 PM

they sell hydraulic oil at tractor supply that is 20W I think its iso46 but read on the back and it will tell you what weight it is. I have used heavier weight on older rear ends that are slow responding or about wore out but if its a good rear end try to stick with what weight the factory recommends if possible.. hope this helps :D


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#4 MiCarl ONLINE  

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Posted January 14, 2017 - 07:21 AM

12 quart case on Amazon: https://www.amazon.c...r/dp/B0052KY07C

 

A little bit of poking around on the web seems to indicate that ISO 68 hydraulic fluid has SAE 20 viscosity.


Edited by MiCarl, January 14, 2017 - 07:29 AM.

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#5 Bill2 OFFLINE  

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Posted January 14, 2017 - 07:49 PM

Glad you found something that works for you  :thumbs:



#6 Firemang OFFLINE  

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Posted January 15, 2017 - 01:33 AM

Tried Napa today with no luck. Found a thread on another site that says that John Deere Hy Gard has the same properties and ISO rating as SAE 20. I found the SAE 20 online in an air compressor/non detergent oil form for about $2.50 a quart but shipping is outrageous! I'd really like to use the Hy Gard as I already have it, thoughts?

#7 MiCarl ONLINE  

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Posted January 15, 2017 - 09:40 AM

From the Deere site: "–  Hy-Gard oil has a viscosity between the ISO grades of 46 and 68 @ 40°C."

 

Here is an interesting chart I found at: https://www.crownoil...-hydraulic-oil/

Viscosity-Equivalents-Hydraulic-Oil-584-


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#8 Firemang OFFLINE  

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Posted January 15, 2017 - 12:04 PM

Well think I'll try the Hy Gard in it and cross my fingers

#9 Bill2 OFFLINE  

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Posted January 15, 2017 - 09:54 PM

hard to keep in mind but from to time, check the oil you choose for signs of wear or oil will be burnt or real dark then you know how it works in your application. Change accordingly  :thumbs:  :thumbs:


Edited by Bill2, January 15, 2017 - 09:54 PM.

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