5. HYDRAULIC DIAGRAM 5.6 AUXILIARY SERVICES CONTROL VALVE OPERATION 1. When the lift control is in neutral position ) The oil from the pump enters chamber a and from here flows into passage b . At the same time the oil flows into chamber c of the flow control (1) through passage d . This causes the spool to shift to the right until the connecting passage between chamber a and passage b is closed. The pressure in chamber e caused by the weight of the implement mounted on the linkage (e.g.: plough), keeps the check valve (2) closed, thereby ensuring that the lift maintains its position. The chamber e is thus a closed chamber that prevents any uncontrolled movement of the lift.
The pressure in chamber e also acts on the antishock valve (3) that eliminates any pressure surges caused by jolting of the implement during work or transport. 3 e 2 R A P a d b c D000 4930 1 10-54