Lift it with a chain and another tractor or jack it up while having valve in lift position ( or remove hyd line on cylinder) and secure 2x4 blocks to ram to hold.
I use a regular chain grinder in my shop, its fast and accurate. Tried that round stone once and it lasted about 5 min. I charge 3.00 off and 7.00 on. I retired but still have people coming in.