Same thing almost happened to me on a Massey Ferguson Backhoe. My dad bought a farm in the Missouri Ozarks and I was helping him with some field work when I set up the Backhoe to do some digging. I didn’t realize I was sitting on top of a spring with quick sand in it. I got down off the tractor to do some elevation shots and notice the tractor was sinking. I tried to move the tractor and it went down on the transmission “bellyâ€. I quickly extended the Backhoe out and lifted the rear end up but the loader was starting to sink. I jumped off the tractor and set the biggest rocks I could pick up, under the backhoe stabilizers. I got back up on the tractor and set the stabilizers to hold the back end up. I tried to lift the loader up, but the front end would just sink down because the bucket was half full with dirt and water. I twisted the bucket in and up at the same time which emptied the bucket, but the front was down on the oil pan. I shut the engine off because the vibration seemed to make it sink faster. I got off the tractor again and placed large rocks under were the flat part of the loader would go. I remounted the tractor, started the engine and used the loaders hydraulics and lifted the front up. I then pulled the backhoe stabilizers up and pulled the tractor with the backhoe. I did this three more times in a period of two long hours and finally the rear tires got enough traction to pull the tractor out.
After I move the tractor to a known secure site, I walked back to the area were I got stuck. It looked just like the rest of the field I was in, but under the thick grass there was a mixture of water and sand.
A year or so later my Father wanted to build a lake on his property and he had an Engineer from Missouri University to assist with the set up of the lake. I mentioned the mishap to the Engineer with the tractor the year before. It struck his interest and he had a Geological Survey done on the site. The site was primarily a spring with ground up sand about 15 feet deep in one spot.
The Backhoe I was on is considered a small Backhoe weighting 10,000 Lbs. If I was on something a little larger I don’t think I would have got it out.
This happen about ten years ago and to this day I still quiver every time I think about it.
Jack Fowler