wsm STW37 Workshop Manual page 392

STW34, STW37, STW40, WSM
 Single Acting Valve – Lift
When the spool (6) moves to right, the oil passage
from P port to PB port is blocked by the spool (6). The
pressure-fed oil opens the check valve (1) and flows to
implement cylinder via unload valve (5) and B
return oil from unload valve (5) flows to the transmission
case through T port.
(1) Check Valve
(2) Poppet
(3) Pilot Valve
(4) Single Acting Cylinder
(5) Unload Valve
(6) Spool
 Single Acting Valve – Down
When the spool (6) moves to left, the oil passage
from P port to PB port is blocked by the spool (6). The
pressure-fed oil in the P port opens the check valve (1)
and flows to transmission case through pilot valve (3)
and T port. The return oil from implement cylinder flows
from B port to transmission case through unload valve
3
and T port.
(1) Check Valve
(2) Poppet
(3) Pilot Valve
(4) Single Acting Cylinder
(5) Unload Valve
(6) Spool
8-M22
HYDRAULIC SYSTEM
port. The
3
P: P Port
(From Hydraulic Pump)
PB: PB Port
(To Control Valve)
T: T Port
(To Transmission Case)
B : B Port
3 3
(To Implement Cylinder)
9Y1211109HYM0029US0
P: P Port
(From Hydraulic Pump)
PB: PB Port
(To Control Valve)
T: T Port
(To Transmission Case)
B : B Port
3 3
(From Implement Cylinder)
9Y1211109HYM0030US0
KiSC issued 11, 2014 A