Kubota B1830, Workshop Manual, Page: 378 / 548

HYDRAULIC SYSTEM B1830,B2230,B2530,B3030, WSM
8-M17
7. REMOTE CONTROL VALVE
Neutral
Pressure-fed oil from the hydraulic pump is delivered
into the P port, and flows to the rear hydraulic outlet
through BY port.
At this time, oil from A port to the T port is blocked by
the mechanical check valve (Poppet (1)). Therefore the
position of implement is maintained at the set position.
9Y1210003HYM0020US0
Lift
When the remote control valve operating lever is set
to LIFT position, the spool (3) moves to the right and the
passage from P port to the BY port is blocked by the
spool (3).
Then the pressure-fed oil open the poppet (1) and
flow through the A port to the hydraulic cylinder to lift the
implement.
9Y1210003HYM0021US0
Down
When the remote control valve operating lever is set
to DOWN position, the spool (3) moves to the left and the
passage from P port to the BY port is blocked by the
spool (3). At the same time, the piston (2) and poppet (1)
moves upward, and open the passage from
A port to T
port.
Then the pressure-fed oil flow through the B port to
the hydraulic cylinder to lower the implement. Return oil
from hydraulic cylinder flows from
A port to the
transmission case.
9Y1210003HYM0022US0
(1) Poppet
(2) Piston
(3) Spool P: Pump Port
T: Tank Port
BY: BY Port (To Position
Control Valve)
A: A Port
B: B Port
(1) Poppet
(2) Piston
(3) Spool P: Pump Port
T: Tank Port
(To Transmission Case)
BY: BY Port
A: A Port
B: B Port
(1) Poppet
(2) Piston
(3) Spool P: Pump Port
T: Tank Port
(To Transmission Case)
BY: BY Port
A: A Port
B: B Port
KiSC issued 05, 2012 A