| 摘要 |
A process of setting the length of an upper steering arm of an attaching device of a tractor. The attaching device includes the upper steering arm with a power drive provided for length setting purposes; a length sensor to determine the actual length of the upper steering arm; two lower steering arms with a lifting mechanism to lift and lower the lower steering arm; a lift sensor to determine the actual position of lift of the steering unit; as well as a control unit. The nominal lengths of the upper steering arm ( 7 ), to be determined as a function of the directions of movement of the lifting mechanism, are stored in the control unit. Determining the actual length of the upper steering arm ( 7 ), the actual position of lift of the lifting mechanism and the direction of movement of the lifting mechanism. Comparing the actual length with the nominal length stored for the direction of movement and for the actual position of lift as determined, and actuating the power drive ( 27 ) for setting the length of the upper steering arm ( 7 ) to the nominal length if the actual length deviates from the nominal length.
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