wsm L4701 User Manual

HYDRAULIC SYSTEM
L3301, L3901, L4701, WSM
8-M12
[4] POSITION CONTROL VALVE
 Neutral
Pressurized oil delivered from the P port, pushes the
unload poppet (2) and returns to the transmission case
from T
1
port.
Since the poppet 1 (3) is closed by the spring located
behind the poppet 1 (3), the oil in the hydraulic cylinder
is not drained to the transmission case.
At this condition, position control is kept at
"NEUTRAL".
The oil in the hydraulic cylinder is cut off by the
actions of poppet 1 (3) and poppet 2 (4).
9Y1211012HYM0010US0
 Lifting
When the control lever is moved to "UP" position,
the spool (1) is pulled out from the position control valve
body as shown in the figure.
The high-pressured oil delivered from P port flows
through the oil passage of the spool (1) into the A
chamber (a).
Since the spring behind the unload poppet (2) and
the pressured oil entered to the A chamber (a) push and
close the unload poppet (2).
At this condition, the pressured oil flows to the C port.
Since the poppet 1 (3) is opened by the pressured
oil, the pressured oil flows through C port to the hydraulic
cylinder, lifting a implement.
9Y1211012HYM0011US0
(1) Spool
(2) Unload Poppet
(3) Poppet 1
(4) Poppet 2
C: C (Cylinder) Port
P: P (Pump) Port
T
1
:T
1
Port
(To Transmission Case)
T
2
:T
2
Port
(To Transmission Case)
T
3
:T
3
Port
(To Transmission Case)
(1) Spool
(2) Unload Poppet
(3) Poppet 1
(a) A Chamber
C: C (Cylinder) Port
P: P (Pump) Port
T
1
:T
1
Port
(To Transmission Case)
T
2
:T
2
Port
(To Transmission Case)
T
3
:T
3
Port
(To Transmission Case)
KiSC issued 09, 2016 A

wsm L4701 Specifications

General

Brand	wsm
Model	L4701
Category	Tractor
Language	English