Abstract: A steering brake locking system for a vehicle, such as an agricultural tractor, has at least first and second adjacent steering brake pedals, and a locking pin arranged to selectively lock the pedals together. The locking pin and at least a portion of the first and second pedals are formed from a conductive material, such that an electrically conductive path is formed between the first and second pedals through the locking pin when the pin is used to lock the pedals together. The locking status of the pedals can be determined by measuring the electrical conductivity between the first and second pedals.

Abstract: A steering brake locking system for a vehicle, such as an agricultural tractor, has at least first and second adjacent steering brake pedals, and a locking pin arranged to selectively lock the pedals together. The locking pin and at least a portion of the first and second pedals are formed from a conductive material, such that an electrically conductive path is formed between the first and second pedals through the locking pin when the pin is used to lock the pedals together. The locking status of the pedals can be determined by measuring the electrical conductivity between the first and second pedals.

Abstract: A multi-ratio tractor transmission system including a series arrangement of a speed changing gearbox and a range changing gearbox. The system is selectively operable in a field working automatic mode and a road working automatic mode, wherein the transmission can only operate automatically within its speed change gearbox when the system is operating in the field working automatic mode.

Abstract: A multi-ratio tractor transmission system including a series arrangement of a speed changing gearbox and a range changing gearbox. The system is selectively operable in a field working automatic mode and a road working automatic mode, wherein the transmission can only operate automatically within its speed change gearbox when the system is operating in the field working automatic mode.

Abstract: A transmission controller for a multi-ratio tractor transmission is disclosed, the controller comprising a control dial (40) which is rotatable in one direction from a central position (43) into a field working zone (42) of movement and in the other direction into a road working zone (44) of movement to set the engine speed at which the transmission (11, 12) changes up in ratio when working in the field and on the road respectively.

Abstract: A control system for a tractor with a semi-mounted plough (2) hitched to it comprises a control system (13) for setting a delay between the lifting/lowering of the tractor linkage (3) and the rear of the plough (2) to cause the individual ploughshares to enter to leave work along a given line parallel to a field boundary. To accommodate field boundaries which are not perpendicular to the ploughing direction, adjustment values representative of the angle of each field boundary to the ploughing direction may be entered into a control unit (13) to cause the delay between lifting/lowering of the front and rear of the plough to be adjusted automatically as each field boundary is reached to take account of the angle of that boundary and also whether the plough is being taken out of or put into work.

Abstract: A control system for the co-ordination of the operation of first and second implements mounted at spaced locations relative to the intended direction of travel of a tractor vehicle. The system can be used to co-ordinate the operation of spaced parts of a larger common implement (e.g. spaced shares on a long plough) or completely separate implements (e.g. ploughs mounted one on the front and the other on the rear of the tractor vehicle). The control system includes actuators for controlling the operation of the first and second implements, a speed sensor for sensing the forward speed of the tractor/implement combination, sensors to indicate the operating condition of the implements and an implement spacing compensation means which allows adjustment of the co-ordination of the operation of the implements dependent on the spacing between the implements.