Gkn Walterscheid Gmbh

John Sayer

Herbert Coenen

A hydraulic lift device for an attaching device of a tractor which has a hydraulic pressure supply device and a hydraulic tank, comprising for each of two lower steering arms, a double acting hydraulic cylinder having a cylinder housing, a piston rod, a piston with a piston-end piston area and a piston rod-end piston area, as well as a piston-end cylinder chamber and a piston rod-end cylinder chamber. The device further comprises a first switching valve, which has at least three switching positions and four ports. The first port represents a connection to the pressure supply device. The second port represents the connection to the hydraulic tank. The third port represents the connection to the piston-end cylinder chamber of the first hydraulic cylinder and the fourth port represents the connection to the piston rod-end cylinder chamber of the second hydraulic chamber. The piston rod-end cylinder chamber of the first hydraulic cylinder is connected via a line to the piston-end cylinder chamber of the second hydraulic cylinder. The piston rod-end piston area of the first hydraulic cylinder and the piston-end piston area of the second hydraulic cylinder have the same size or a predetermined size relationship to each other.

Hydraulic lift device for an attaching device

An assembly with a lower steering arm has a strut,and an attaching end,To achieve a cost-effective design while at the same time reducing the play between the attaching end,and the end of the strut,received therein, the attaching end,includes a base member,and a cover,A blocking pawl,is supported in the base member,The cover,is welded to the base member,and comprises a stop face,for the end face,of the strut,Thus, any tolerances in the region of the base member,provided in the form of a forging do not affect the position of the stop face,The latter can be aligned when connecting the base member,and the cover,Because of its setting contour, the actuating lever,can be used for both the right hand and the left hand lower steering arm.

Lower steering arm assembly for an implement attaching device

An assembly with a lower steering arm has a strut,and an attaching end,. The attaching end,includes a base member,and a cover,. A blocking pawl,is supported in the base member,. The cover,is welded to the base member,. The cover,includes a stop face,for the end face,of the strut,. Thus, any tolerances in the region of the base member,provided in the form of a forging do not affect the position of the stop face,. The latter can be aligned when connecting the base member,and the cover,. Because of its setting contour, an actuating lever,can be used for both the right hand and the left hand lower steering arm.

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Bridgnoth, United Kingdom

John Sayer