Utility vehicle horsepower management

A control system for controlling an engine and a hydrostatic pump of a power machine, a rotational speed of the engine being controlled by an engine speed control device in response to a user input, and displacement of the hydrostatic pump being controlled by a position of a swash plate actuated by a rotatable actuator, the control system comprising:

• a command lever rotatably coupled to the rotatable actuator and coupled to the user input and to the engine speed control device such that movement of the user input causes rotational movement of the command lever about the rotational actuator, the rotational movement of the command lever being transmitted to the engine speed control device to control the engine speed;
• a pintle lever fixed to the rotatable actuator such that rotation of the pintle lever controls the position of the swash plate;
• and
• a spring mechanism coupling the command lever to the pintle lever such that when the command lever is rotated by movement of the user input, the pintle lever is rotated to change the displacement of the hydrostatic pump subject to load forces on the hydrostatic pump transmitted to the spring mechanism that limit rotation of the pintle lever in response to rotation of the command lever.