First off, its been a few years since I asked, but at that time, anything still under warranty used in dozers, the use of Hytran would void the warranty, they'd test the oil to make sure nothing but TCH was in the transmission, I'm not sure, but I don't think its changed any, but you'd have to ask Case.
Next you'd have to believe Case and those doing their testing, but the claim was, Hytran over time would cause the clutch disc's to shed the material off prematurely I guess is the jest of it, and cause transmission issues before the warranty was off, and in that case if Hytran was present, the customer paid the entire bill and there was no warranty.
Now if the warranty was off, pretty much do as you wish, nobody cares at that point, there is nobody to argue with over any bill, the customer pays it all anyhow.
I've been on both sides of this argument, not on new machines, but rebuilt transmissions that were under warranty and did have issues before the parts and labor warranty was up, to have found someone dumped hytran into the transmission at some point, [just a note, hytran can be used in the hydraulics of case dozers, but not the transmissions] and since they are seperate, but both had hytran in them, my warranty was void and I paid the entire bill. Now that aside, what caused the issue on my dozer, personally I felt it was bad/cheap/crappy/covered up components that were put in during the rebuild, but unable to prove. Now that stated, I've used plenty of other fluids in my dozer transmissions over the years since and other than operator abuse and neglect we've had no issues in many thousands of hours of use, and ironically the clutch discs they put back in at the time of the second rebuild were not the same as those taken out with less than a years use on them and failed. You draw your own conclusions, I never got anywhere arguing, but it was pointed out in writing stating TCH was the only approved fluid in dozer transmissions up to that date, and for many years afterwards as well, again, not sure on the latest models since I don't own anything newer that the E's and H's.
So what's the issue.....................you'll have to figure it out for yourself, unless you've had a very recent transmission rebuild and its still under warranty, [if that even exists anymore] I'm not sure its an issue, I've also noticed the disc's themselves have changed over the years and its supposed to also have something to do with how often you change the fluid and how much moisture is in the oil and a host of other issues. But I do know, additive packages are far different between oil makers, so the hytran, case's version has different additives than deeres version, vs farm fleets version and so on. How well do they play together once mixed and what issues they cause is a whole argument in its own. Some feel the fiber disc's were the issue, some the oil, some claimed it was the TCH itself that was the issue, some felt Hytran's formulation [which has changed in the last three decades] is to blame, so it gets down to, believe who you want. Myself, once the warranty is off, we try to only use one brand of oil in the whole machine, transmission, hydraulics and even engine and if we switch brands, all the fluids get changed and we write on the machine, it now has this brand in it and this viscosity in each component to help save issues down the road somewhat and try to use oil sampling to determine high contaminate levels or water levels to determine change intervals.
At one time we had a lot of case dozers in my area, anything smaller, case had the market share and this was a hot topic for decades, everyone had their own ideas and those they believed and would argue to the death, today, those machines are so old by standards, the numbers are still out there, but you don't hear the issues anymore so much. Now is that due to better components, better oil, less hours of use each year per machine, lower cost to repair the older dozers verses newer dozers, better aftermarket parts, better OEM parts or the fact, most anyone can fix those dozers themselves so its not talked about like it was before??
30 years ago a 20,000 dollar transmission rebuild was a huge deal, today, it probably wouldn't even raise an eyebrow compared to what everything else costs.
