Hello, my name is John new to this forum and kubota tractors. I own other tractors and a skid steer but this is my first kubota. It is a 1992 B7100 HST D 4WD. I bought this tractor not running with a blown head gasket from a lady that her husband passed away and she was cleanning out the barn. It has been sitting for several years. My question is all the hydrostatic tractors I have owned in the past and now,you could not push them without turning a pressure release valve this one I can push in high,low or nututral. Is this normal for this tractor? Sorry for the stupid question and thanks for any replies. John