Patterson, Roger L.,Bell, Andrew William Dean,Enns, John Edward
申请号：
AU2012339549
公开号：
AU2012339549A1
申请日:
2012.11.16
申请国别(地区):
AU
年份:
2014
代理人:
摘要：
A tractor having a header flotation system including a header having a header frame, a spring float assembly connecting the header frame to a mounting system at a first end of the tractor so as to allow floating movement of the header relative to the mounting system over a range of floating movement, the spring float assembly including at least one resilient spring which flexes in response to the floating movement and said at least one resilient spring including an actuator operable to ad just a spring force of said at least one resilient spring and including a spring calibration system comprising an initiator for initiating a calibration operation a detector for providing an output signal indicative of a position of the header within the range of floating movement and a control system arranged, when the calibration operation is initiated, to operate the actuator to change the spring force of the spring, to detect a predetermined position of the header within the range of floating movement and to set the actuator at a set condition when the predetermined position is reached.
