Three point linkage coupling for farm implement - has top link with intermediate member consisting of closed hydraulic cylinder with manual control of fluid transfer between end chambers

摘要

The three point linkages has an intermediate frame with a top link made as an hydraulic cylinder which is closed at both ends and fixed to the tractor via a ball joint arrangement. The piston rod is fixed to the implement via a ball joint. The rubber sleeve seal consists of several cohesive rubber rings, which are supported in ring grooves of the cylindrical piston.