At one time Deere had Hydraulic Front Wheel Assist as they called it,but not for long. Once they saw that everyone else had a better mechanical system they finally switched over. The hydraulic systems are only for limited use to help you through a sticky spot,not continuous use like true mfd systems.Hydraulic systems do not lend themselves to loader work either very well!! I guess that is why we do not see them on tractors today. Some owners of 20,30,and 40 series Deeres with HFWA say all, they do is smoke and scream when they engage the front axle,and go no where.