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From my experience, it is common for one track to stop. Lubrication is by splash-oiling. This is what I posted to someone else on the subject: I've got several crawlers with the Clark planetary drive transaxles. Case used it, so did Terratrac, Cletrac, and Bombardier. I've got three good running crawlers, my neighbor has eight, and I've had many more apart. Under most conditions you will have power to both tracks - either both turning the same speed, or one subtantially slower than the other, but not under ALL conditions. You CAN make one track totally stop while the other is driving. If desired, I've got the Clark mechanical drawings here, and also a differential sitting on my desk, all apart for anyone who cares to scrutinize.
It's quite possible your differential is falling apart; they do that. The tie bolts and dowels that hold the unit together tend to come loose and/or break - it's a common problem. Pull the back trans. cover off and inspect. In regard to oil, EP (extreme pressure additives) tend to clog the brake bands, especially phosphorus and sulfur. That's why Clark calls for GL1 or SAE non-detergent motor oil to be used. Case might of added their own specs. Most call for SAE 30 weight up to SAE or GL1 140 oil depending on the ambient temperature
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