Hydraulic apparatus for operating track markers of agricultural machines

摘要

A hydraulically switchable path valve (11) is mounted in the pipe (6) leading from the hydraulic valve (7) on the tractor side to the gangway marking valve (1). A branch pipe (13) coming from a further hydraulic valve (12) on the tractor side is attached to the pipes (2,3) leading from the gangway marking valve (1) to the hydraulic cylinders (4,5) of the track marker. A non-return valve (15) is provided in each branch pipe behind the branch and the branch pipe (13) itself is connected through a by-pass (16) to the switch attachment (17) of the path valve (11).