Patent ID: 7967099

Claim:
A method of controlling the propulsion of a machine having a main frame, at least first and second rotatable motivators coupled to the frame in spaced relation, an engine supported on said main frame, a first hydraulic motor operatively connected with said first motivator, and a second hydraulic motor operatively connected with said second motivator, the method comprising the steps of fluidly coupling a first pump to said first hydraulic motor, operatively connecting the first pump to the engine, fluidly coupling a second pump to said second hydraulic motor, operatively connecting the second pump to the engine, disposing at least one fluid control orifice in fluid communication between said first and second pumps, said fluid control orifice being adapted to allow fluid flow between the first and second pumps, selectively disengaging the orifice to discontinue flow between the first and second pumps in response to a signal during operation of the machine.