Boeing, I've lifted the bucket just as Winston suggested on a dead tractor. Get pressure applied upward, whether by a jack underneath it, or a board on a fulcrum. Pull the lift control for the loader, and it will go up, repeat as needed. I bought a little Kubota
B6000 that was dead, and needed to winch it out of a horse stall around a 90 degree corner. I finally got it where I could reach it the front of the machine, and was able to lift the bucket by hand enough to do this, until I could reach it with a set of jumper cables and spin the motor to power the pump.
If the tractor will crank, but not start, just spin the engine and the hydraulics will all work. Make sure to raise any implement on the back too, obviously, before the battery goes dead.
If you're dragging it on backwards with the bucket down, as it starts to go up the ramps it will start running on the bucket-pull the lift control and it will float up.
With a rolling load, a good sized winch should pull anything you can trailer behind a regular pickup up a set of ramps. With a 2:1 block it should be no sweat at all, but may take awhile to get it close enough.
If you can't get the bucket to raise, or don't have a jack, once the cable is wormed underneath the bucket, when you apply tension on the cable you can work the controls of the loader and it will be pushed upward by the cable.