Hydraulic lifting arrangement for implements, especially on tractors

摘要: An improvement in apparatus for lifting an agricultural implement carried by a tractor provides automatic rapid level adjustment of the relative to terrain under control valve system which comprises regulator controlling inlet flow pump responsive comparator implement. A continuous throtted from regulating is maintained at constant pressure tending open while sensor or feeler contacting ground serves effect greater lesser opposing force. servo provided effects back acting together with actuation. equilibrium position determines changed, holding it on until actuated encountering rise fall terrain. The construction varying elevation either raising lowering meet