TM 5-3895-383-24
Control Valve
SMCS Code: 5051
Part No. 7X-8382
Illustration 17
Control Valve
(1) Detent. (2) Centering spring. (3) Passage to piston end of cylinder. (4) Outlet passage. (5) Passage to head end of cylinder. (6)
Spool. (7) Relief valve. (8) Inlet passage. (9) Valve body.
The control valve is an open center directional valve. The
control valve is classified as a our-way valve. The blade
control lever directs the control valve in order to allow oil to
flow to the blade cylinder.
The operator sets the position of the control valve by moving
the blade control lever at the operator console. The control
valve operates in the following four positions:
RAISE
HOLD
LOWER
FLOAT
Spool (6) is held in the HOLD position by centering spring (2).
The control valve contains detent (1) which holds spool (6) in
place when the control valve is set in the FLOAT position.
Relief valve (7) is located in the valve body (9). The relief
valve has a screw adjustment in order to limit maximum
pressure to 8618 345 kPa (1250 50 psi).
Oil from the metering pump enters valve body (9) at inlet
passage (8). Passages (3) and (5) are connected to the blade
cylinder. Return oil flows through outlet passage (4) to the
charge circuit.
13-14
