Abstract: A cam lock device for replacing the conventional pins connecting a loader mechanism to a prime mover, the device in conjunction with a modified loader mounting bracket, provides an adjustable, easily installable and removable apparatus that allows secure and convenient attachment/detachment of a loader mechanism to a prime mover.

Abstract: A cam lock device for replacing the conventional pins connecting a loader mechanism to a prime mover, the device in conjunction with a modified loader mounting bracket, provides an adjustable, easily installable and removable apparatus that allows secure and convenient attachment/detachment of a loader mechanism to a prime mover.

Abstract: Method and apparatus to simplify the process of adding a loader to a tractor after the manufacturing process. A pair of mounting brackets, one on each side of the tractor, each comprises a front piece and a rear piece. The rear piece is affixed to the tractor during the manufacturing process and the front piece, including a bearing surface for a transverse support axis of a loader, is selectively affixed to the respective rear piece and tractor when a decision to incorporate a loader is taken.

Abstract: Method and apparatus to simplify the process of adding a loader to a tractor after the manufacturing process. A pair of mounting brackets, one on each side of the tractor, each comprises a front piece and a rear piece. The rear piece is affixed to the tractor during the manufacturing process and the front piece, including a bearing surface for a transverse support axis of a loader, is selectively affixed to the respective rear piece and tractor when a decision to incorporate a loader is taken.

Abstract: A control system is provided for a hydraulically operated tractor hitch assembly including a rockshaft operated by a main cylinder which is controlled through a spool valve operated by a pilot cylinder which is controlled, in turn, through a solenoid operated pilot valve. The pilot valve is selectively controlled from first and second detector circuits through a gating circuit which is controlled by a third detector circuit which responds to a first error signal developed by comparing a command signal which corresponds to a rockshaft target position and a first feedback signal which corresponds to the actual rockshaft position and which is generated by a potentiometer connected to the rockshaft.

Abstract: A control system is provided for a hydraulically operated tractor hitch assembly including a rockshaft operated by a main cylinder which is controlled through a spool valve operated by a pilot cylinder which is controlled, in turn, through a solenoid operated pilot valve. The pilot valve is controlled in response to a command signal and first and second feedback signals which correspond to the position of the rockshaft and to the position of the spool valve member. The velocity of the downward movement is limited by limiting the amplitude of a first error signal which is developed by a first comparator responsive to the command and first feedback signals with the first error signal and the second feedback signal being applied to a second comparator. Such velocity-limiting operations are controlled through a manually operated switch or by a motion sense circuit responsive to the rate of change of the command signal.

Abstract: A directional flow control spool in an open center flow type of valve is provided with primary and secondary flow metering notches in the path of the center flow. The secondary metering notches provide an additional force which assists in the axial shifting of the control spool from a central neutral position.