Leveling Blade Control Valve
Leveling Blade Control Valve.
(1) Detent ball and spring. (2) Centering spring. (3) Passage to piston end of cylinder. (4) Outlet passage. (5) Passage to head end of cylinder. (6)
Spool. (7) Valve body. (8) Inlet passage. (9) Relief valve.
The control valve is a four-way, four-position, open center
directional valve. The control valve allows oil to flow to the
blade cylinder as directed by the blade control lever.
The operator sets the position of the control valve by moving
the blade control lever at the operators console. The four
positions are RAISE, HOLD, LOWER and FLOAT.
Spool (6) is held in the HOLD position by centering spring (2).
The control valve contains detent ball and spring (1) which
holds spool (6) in place when the control valve is set in the
Relief valve (9) is located in the valve body (7). The relief
valve is screw adjustable to limit maximum pressure to
10 330 ± 345 kPa (1500 ± 50 psi).
Oil from the steering priority valve enters valve body (7) at inlet
passage (8). Passages (3) and (5) are connected to the blade
cylinder. Return oil flows through outlet passage (4) to the
hydraulic oil filter and second brake valve.