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various rules and regs. if memory serves OSHO. wants front tires and rear tires off the ground (using FEL to raise front tires, and then using out riggers on rear to lift tractor off grand just a little bit) goal. if something accidently hits a lever or puts it in gear. tractor does not take off.
generally myself. put the out riggers down just enough to begin taking weight off the rear wheels. and then using FEL also barely take weight off front wheels. all wheels still on ground just taking the weight off some. it tends to give me a bit more "traction" from slipping and sliding when using the backhoe. and overall seems more stable.
manuals more likely state it DO NOT DO IT. but putting the bucket down right next to tractor. and then lifting rear of tractor up to scoot the tractor left / right / forwards / backwards. it can be hard on the various pins and linkages and overall framework of the backhoe itself. and you are at higher risk of flipping tractor over. but... *shrugs* depends on operator. i get a little squimmish when i do it. (normally stuck already, and sitting in a rut that could easily tip me over if things begin slipping and sliding)