4. When the position control lever is moved to the Lowering position, the control arm (2) rotates to the arrow. Therefore, the spool drive lever (1) moves around the fulcrum P and push the spool (3) and poppet 2 (4) opening the Lowering circuit.
5. When the lift arm moves downward, the feedback lever shaft (5) is rotated to the arrow, since the feedback rod (6) is actuated. Therefore, the spool drive lever (1) moves around the fulcrum Q and pull the spool (3).
6. The lift arm stops when the spool (3) returns to the neutral position.
