Patent ID: 7077221

Claim:
An agricultural tractor comprising: a main frame with front and rear axle assemblies including ground-engaging wheels; an operator's platform supported on said main frame; an engine supported on said main frame; a hydrostatic pump with a control servo supported by said main frame and connected to said engine such that said pump receives power from said engine, said pump also connected to at least one of said front and rear axle assemblies and providing power thereto; a forward/neutral/reverse lever attached to said hydrostatic pump to control the direction and speed of the output therefrom; a service brake for slowing and stopping the rotation of said ground-engaging wheels; a sensing device for sensing that said service brake has been actuated; a control device connected to said control servo of said hydrostatic pump, said control device capable of actuating said control servo from a first position corresponding to either a forward or reverse movement position of said forward/neutral/reverse lever as determined by an operator to a second position corresponding to the neutral position of said forward/neutral/reverse lever; a signal transfer device interconnecting said sensing device and said control device whereby actuation of the service brake is sensed by said sensing device and a signal transferred by said signal transfer device to said control device, moving said servo control from said first position to said second position; and a return device connected to said sensing device and said control device to return the control servo to said first position when the service brake is no longer actuated, wherein said sensing device comprises a service brake pedal attached to a pivoted bell crank and a service brake master cylinder such that actuation of said service brake pedal causes said bell crank to pivot about a pivot point, said control device comprises a mechanically actuated cartridge valve integral with the hydrostatic pump control servo, and said signal transfer device comprises a cable mechanism.