This is something I didn't want to do. In fact I was a little itimidated about the idea of jacking up such a big peice of machenery on uneven dirt. But its how the pros do it and I really didn't have a choice.
I save my PT blocks of wood for just such an ocasion and have a 20 ton jack from Northern Tools that I used on home repair jobs. And of course my trusty shovel. I have over $50,000 in tractors for moving dirt, and my $20 shovel is now my most important tool. Go figure.
It was kind of scary watching those boards compress under the weight of the dozer. It's about 40,000 lbs. I kept thinking that if this thing drops and I get caught under it somehow, nobody will even look for me for a week at the earliest, so I put my cell phone in my pocket in case I lived through an accident.
No problem, just slow going. I'd max out the jack so I could get one 2X8 under the dozer. The weight would compress so much thats as far as I could get each time.
Then it was shovel time.