Patent ID: 8899031
Filing Date: 2014-12-02
Classification: E02F,F15B

Abstract:
1. A work vehicle comprising: an ignition; an engine; a hydraulic motor; an integrated hydraulic pump having a pump portion and a valve portion, the valve portion having a first position blocking hydraulic fluid from recirculating between the pump portion and the valve portion, a second position allowing hydraulic fluid to recirculate between the pump portion and the valve portion without exiting the integrated hydraulic pump, and an actuator for moving the valve portion to the second position, the pump portion operably connected to the engine; an engine speed sensor for detecting an engine speed; a temperature sensor for detecting a temperature of hydraulic fluid; and a vehicle controller unit in communication with the engine speed sensor, the temperature sensor and the actuator, the vehicle controller unit configured to energize the actuator and move the valve portion from the first position to the second position when (1) the ignition is on, (2) the engine speed is lower than a first predetermined engine speed, and (3) the temperature is below a predetermined temperature, the vehicle controller unit configured to cease energizing the actuator of the valve portion when the engine speed is above a second predetermined engine speed greater than the first predetermined engine speed.