I have a B2400HD Kubota with a 3 point hitch backhoe on the back. The propeller shaft coupling near the HST pump (shaft from clutch to HST pump) or the shaft itself broke, so I'm trying to load the tractor on a trailer to take it in to get fixed using a come along to pull it on. Looking at the tracks it's made the rear wheels were turning at first, but then they locked up so it's just dragging them across the ground. I've dismounted the backhoe and the PTO turns freely. It's in 2 wheel drive currently. The brakes are off. I've got both rear wheels of the ground and neither will turn at all. I'm stumped! Any one have an idea what's going on?