Patent ID: 6843340

Claim:
A hydraulic apparatus for a vehicle comprising: a) a right side drive including a first right side hydraulic motor operable to drive a first wheel and a second right side hydraulic motor operable to drive a second wheel, wherein the first right side hydraulic motor is hydraulically connected in series with the second right side hydraulic motor; b) a left side drive hydraulically connected in parallel with the right side drive, the left side drive including a first left side hydraulic motor operable to drive a third wheel and a second left side hydraulic motor operable to drive a fourth wheel, wherein the first left side hydraulic motor is hydraulically connected in series with the second left side hydraulic motor; c) a hydraulic pump in fluid communication with the right side drive and the left side drive; and d) a valve bank comprising a first valve section adapted to control fluid flow between the pump and the right side drive and a second valve section adapted to control fluid flow between the pump and the left side drive, and means for proportioning hydraulic fluid between the first valve section and the second valve section.