System for controlling the torsional output of a hydrostatic transmission of a work vehicle

A work vehicle, comprising:

• first and second wheels;
• a first hydraulic motor configured to rotationally drive the first wheel;
• a second hydraulic motor configured to rotationally drive the second wheel;
• a pump configured to supply fluid to the first and second hydraulic motors;
• an engine configured to drive the pump;
• a hydrostatic circuit provided between the pump and the first and second hydraulic motors, the hydrostatic circuit including a first fluid conduit fluidly coupling the pump to the first hydraulic motor and a second fluid conduit fluidly coupling the pump to the second hydraulic motor;
• a pilot-operated first valve provided in association with the first fluid conduit, the first valve configured to be actuated from an opened position to a closed position to occlude fluid flow through the first fluid conduit from the pump to the first hydraulic motor when a fluid pressure within the first fluid conduit at a location downstream of the first valve drops below a first pressure threshold;
• and
• a pilot-operated second valve provided in association with the second fluid conduit, the second valve configured to be actuated from an opened position to a closed position to occlude fluid flow through the second fluid conduit from the pump to the second hydraulic motor when a fluid pressure within the second fluid conduit at a location downstream of the second valve drops below a second pressure threshold,
• wherein, when reduced contact between the ground and one of the first wheel and the ground or the second wheel occurs, the associated valve is actuated to the closed position due to a drop in the downstream fluid pressure below the associated pressure threshold such that an increased flow of fluid is delivered through the other of the first valve or the second valve to increase a torque applied to the other of the first wheel or the second wheel.