Arrangement for the movement of a working unit

In an agricultural working implement including at least one working unit mounted thereon for movement between first and second positions, an extensible and retractable actuator coupled to said working unit and including a chamber, a medium under pressure and a medium reservoir connected to said chamber by way of a first control arrangement operable for selectively coupling said chamber either to said medium under pressure or medium reservoir, and said actuator being coupled with said working unit in such a way that it brings the working unit into said second position when the medium is applied to the chamber, and permits said working unit to move to said first position when the chamber is coupled to said reservoir, the improvement comprising:

• an accumulator, and an accumulator control device coupled between said accumulator and said chamber for connecting said accumulator to said chamber only when said working unit is in said first position.