Hydraulically adjustable top linkage for tractors - piston rod of piston-cylinder can be fixed by manual valve

摘要

The hydraulically adjustable top linkage is for a tractor three-point suspension with a cylinder, whose piston rod can be positioned by a tractor control and whose cylinder chambers are separated by the piston. The piston rod (2) can be fixed with respect to the housing (1) of the cylinder (7) and at least in its withdrawn end position. This fixing is effected by a manually operated valve which cuts off the hydraulic line passing into the cylinder chamber (4).