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Old 08-10-2010, 11:46 AM   post #16 of 35
farmer69
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

I,ve always used what JD recommends. For about the last 35 years and 4 mowers and no trani problems.
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Old 08-10-2010, 11:55 AM   post #17 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

I've always used Pennzoil (High quality) or Bradpenn (Make it right here in PA 20 miles from me! With 100% pennsylvania crude) Never ever had sludge with them. the people you saw probably never changed the oil! You are putting engine oil in a Hydro trans-axle made to run on hydrolic oil.
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Old 08-10-2010, 12:43 PM   post #18 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

I think the distinction between hydraulic fluid and engine oil isn't very much.

1. I mentioned my friend's car that runs a common motor oil that is shared by both the engine and the transmission

2. Engines have hydraulics in them, such as the lifters, so the engine oil is also performing a hydraulic function

3. Many hydros, especially cheaper ones, use engine oil as their recommended oil.

4. Synthentic oils probably offered expanded ability, performing the duties of a engine oil and offering the hydraulic abilities of a hydraulic fluid.

5. If Tuff Torq suggests a 5W-50 lubricant in their hydros, and to my knowledge, there isn't a single tranny-only hydraulic fluid made, then they must be talking about using an oil made for engines, not for trannies. Another responder said a TT tech told him to use the Castrol 5W-50 which must be the engine oil.

Maybe it is time to write my own mail to TT and ask them if their recommendation also encompasses the Mobil 1 and possibly other products I am not aware of.

Thanks again!
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Old 08-10-2010, 12:57 PM   post #19 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

I think the information on the TT web site says it all:

K71A, B, C, P J20C Hy-Gard High Viscosity J20C Hy-Gard High Viscosity 4.60

K71E, G, H, J, L 5w50 Synthetic Motor Oil - Part# 1115 10w30 API Class Motor Oil 4.60

1. they are specifying a MOTOR OIL in all instances, not a hydraulic fluid

2. The former K71 recommended fluid was plain old 10W-30 motor oil (can't tell in how I did it, but the second suggestion was the former suggestion, the first one is the currently suggested fluid)

3. The K71s sold to JD they suggest JD fluid (probably under duress).

4. All other K71s suggest 5W-50 synthetic MOTOR OIL.

Do you really think there is a difference between the various K71 trannies sold by JD and to everyone else? Not much difference than TV manufacturers adding a special knob or button on a TV so they can call it a different model number so people can't price compare between the major audio/video stores vs. wholesale stores.
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Old 08-10-2010, 09:05 PM   post #20 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

Here is some more info on TT. K71 is not listed but K72 is, might help.

http://www.tufftorq.com/level4.asp?ID=5


http://www.tufftorq.com/level3.asp?ID=1
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Last edited by cgreencorn1; 08-10-2010 at 09:07 PM. Reason: More info on TT trans
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Old 08-10-2010, 11:38 PM   post #21 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

As long as you use anything that is JD rated you are OK with warranty. After that you can use whatever you want and if it is what the tranny manufacture recommends i'd go for it. As for Deere putting their label on some elses oil that what they do. It's blended right in town here by a company you probably never heard of.
In the dept I work in we use over 2900 gals of high guard every day.
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Old 08-11-2010, 09:33 AM   post #22 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

Quote:
Originally Posted by stladrill View Post
Castrol make 5w50 synthetic

This is what I put in my transaxle.

stladrill did you notice any difference using the 5w50 synthetic. My previous machine LA140 had very loud trany noise in the winter until it warmed up. Stored in a unheated barn. I will be changing the trany oil in my new machine X500 and was hoping it would help reduce the trany noise.
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Old 08-11-2010, 09:57 AM   post #23 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

Quote:
Originally Posted by 61woody View Post
It's blended right in town here by a company you probably never heard of.
In the dept I work in we use over 2900 gals of high guard every day.
Okay....curiosity killed the cat, but I would like to know what is the Hygard "blended" from....in other words what are the components? What is the name of the company that does the blending? Also where do you work that uses 2900 gals per day of Hygard?
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Old 08-11-2010, 11:17 AM   post #24 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

Quote:
Originally Posted by cgreencorn1 View Post
stladrill did you notice any difference using the 5w50 synthetic. My previous machine LA140 had very loud trany noise in the winter until it warmed up. Stored in a unheated barn. I will be changing the trany oil in my new machine X500 and was hoping it would help reduce the trany noise.
Yes when I change the oil the first time on the K46, here is my quote from the thread I did about the oil change.
Quote:
And now the road test, first remark less noisy and better response on the pedal (forward and reverse)
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Old 08-11-2010, 02:40 PM   post #25 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

Thanks for the info which says what I said I wrote TT and got a reply. Here it is:

"You are correct 5W-50 Synthetic would be our preferred choice. We have the 5W-50 full Synthetic Oil available for $7.99 a liter, but if you prefer to
buy it locally then Mobil 1 should be fine. Please let me know if you have
questions."

They wouldn't say whose product they are selling, but unless it is a custom blend, I can only find two products on the market so far, the Mobil 1 and the Syntec, neither of which have I found locally yet.

Quote:
Originally Posted by cgreencorn1 View Post
Here is some more info on TT. K71 is not listed but K72 is, might help.

http://www.tufftorq.com/level4.asp?ID=5


http://www.tufftorq.com/level3.asp?ID=1
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Old 09-19-2010, 11:11 AM   post #26 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

Wanted to report that I found that a company called Lube Tech is the local (possibly regional and national) distributor for Mobil 1. I was able to order a case through their local office and I just picked it up the other day. Although dealing right with the distributor, the 5W-50 was almost double the almost same oil at Wally World, just a different weight. I heard Wally World in Canada sells 5W-50 but don't remember them saying what they pay for it.

Will get back to you when I have done the tranny fluid change.
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Old 04-27-2011, 08:23 PM   post #27 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

Since I just got my GT235, I wanted to change all fluids and filters. I do not have a service or owners manual, but I just called a local dealer and told them what I was after. For the transaxle, I received:

Low Viscosity, Hy-GARD Transmission oil (#TY22035).

I guess that is what the tractor calls for??? Can anyone confirm that? I'll be draining and refilling it this weekend. Don't want to damage that bad boy!!
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Old 04-27-2011, 09:17 PM   post #28 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

I just changed the oil in my K46 a few days ago and I used 5W50 Castrol Syntec. I bought it at an Auto Zone in PA on the NY border.



I did notice that after the oil change it was a little quieter, couldn't really tell a difference in performance or responsivness.
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Old 04-27-2011, 09:19 PM   post #29 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

Lots if interesting reading here and some valid points. I have spent my life repairing and maintaining automobiles, mostly european but a fair number of American and Japanese too. I have seen more than a few instances of well meaning mechanics cause a lot of damage by "engineering" a change in a specified fluid. Sometimes that fluid you are changing is great for the item you are focusing on but not so great for something else. What I'm trying to say is that in the case of my own X534 the power steering and deck lift use the same oil as the hydro. Is Synthetic 5W-50 the correct oil for these systems too? I don't know so I went with what the manufacturer wanted. I'd rather be safe than sorry and I can always change more often if I am worried about the oil breaking down.... If I had a tractor that didn't have these additional systems I'd go with the TT recommended synthetic oil, but the lack of first hand knowledge about the synthetic in these makes me feel safer with the JD recommended oil...
Just my 2 cents worth...
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Old 04-27-2011, 09:29 PM   post #30 of 35
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Default Re: GT235 Tuff Torq K71 Transmission Fluid

Ever think that TT recommends 5w-50 syn as it's CHEAPER for them than JD Hy-Gard would be and is more readily available for most of their customers? Plus, it doesn't tick off any other OEM's that don't have their own specific hydraulic oil like JD does (think Husqvarna).

And by the way...Hy-Gard is an oil "designed specifically for hydros". Ever wonder what is run in a JD hydro bulldozer? Also, the IVT transmissions (infinately variable trans) in some of the Ag tractors have a hydro component to them. Again, they use Hy-Gard. Thus...Hy-Gard is specifically designed for hydro applications. Good enough for my $100,000 Ag tractor transmission, it's good enough for my L&G tractor.

Just sayin'

Last edited by Engine_Tech; 04-27-2011 at 09:34 PM.
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