I have a 2013 B2620. Was tilling my garden the other day, got a little stuck and was rocking back and forth to free myself and started to hear a high pitched whining from underneath and then it wouldn't move anymore. I let it sit over night to let the oil cool down to thicken and was able to get it out of the garden, but as soon as it warms up the whining comes back and it won't move. I checked the fluid, and thinking it was low, overfilled it and it shot out the fill cap all over the back of the tractor. I have since change the fluid and filter, ran it and rechecked it for proper fill level, but have the same result. I did not use Kubota brand oil, but another brand that said it was safe for Kabota HST systems. With spring time here I really need my tractor.