wsm STW37 Workshop Manual page 390

STW34, STW37, STW40, WSM
 Double Acting Valve – Down
When the spool (3) moves to right, the passage from
P port to PB port is closed. The pressure-fed oil opens
the check valve (2) and flows to implement cylinder via
port. The return oil from implement cylinder flows from
B
2
port to transmission case through T port.
A
2
(1) Double Acting Cylinder
(2) Check Valve
(3) Spool
P: P Port
(From Hydraulic Pump)
PB: PB Port
(To Control Valve)
 Single / Double Acting Valve – Lift (Double
Acting)
When this valve is used in double acting mode, the
selecting valve (2) is turned counterclockwise to close
the passage from selecting valve (2) to transmission
case.
When the spool (4) moves to left, the oil passage
from P port to PB port is blocked by the spool (4). The
pressure-fed oil in the P port opens the check valve (1)
and flows to implement cylinder via A
oil from implement cylinder flows from B
transmission case through T port.
(1) Check Valve
(2) Selecting Valve
(3) Double Acting Cylinder
(4) Spool
 Single / Double Acting Valve – Down (Double
Acting)
When the spool (4) moves to right, the oil passage
from P port to PB port is blocked by the spool (4). The
pressure-fed oil in the P port opens the check valve (1)
and flows to implement cylinder via B
oil from implement cylinder flows from A
transmission case through T port.
(1) Check Valve
(2) Selecting Valve
(3) Double Acting Cylinder
(4) Spool
8-M20
HYDRAULIC SYSTEM
T: T Port
(To Transmission Case)
A : A Port (From Implement
2 2
Cylinder)
B : B Port
2 2
(To Implement Cylinder)
9Y1211109HYM0024US0
port. The return
1
port to the
1
P: P Port
(From Hydraulic Pump)
PB: PB Port
(To Control Valve)
T: T Port
(To Transmission Case)
A : A Port
1 1
(To Implement Cylinder)
B : B Port
1 1
(From Implement Cylinder)
9Y1211109HYM0025US0
port. The return
1
port to the
1
P: P Port
(From Hydraulic Pump)
PB: PB Port
(To Control Valve)
T: T Port
(To Transmission Case)
A : A Port
1 1
(From Implement Cylinder)
B : B Port
1 1
(To Implement Cylinder)
9Y1211109HYM0026US0
KiSC issued 11, 2014 A