STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM
8-M10
[2] POSITION CONTROL VALVE
The control valve is composed as shown figure left.
The spool (3) is moved by operating the position
control lever. The positions of the spool movement
makes four kinds of circuit such as "Neutral", "Lifting",
"Lowering" and "Floating".
Feature of this control valve is smooth operation by
built-in shockless mechanism.
Refer to "Position Control Valve -Type 4" in Workshop
Manual of Tractor Mechanism (Code No. 97897-
18200).
[3] FEEDBACK LINKAGE
Position control is a mechanism to raise or lower the implement attached to the tractor in proportion to the
movement of the control lever.
The implement can be positioned at any height by moving the position control lever. Fine position adjustment is
also easy.
(1) Poppet 1 P : Pump Port
(2) Poppet 2 C : Cylinder Port
(3) Spool T1 : Tank Port 1
(4) Unload Poppet 1 T2 : Tank Port 2
(1) Unload Poppet 2 T3 : Tank Port 3
A : Chamber A
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(1) Position Control Lever
(2) Feedback Rod
(3) Lift Arm
(4) Feedback Lever
(5) Control Valve
(6) Spool
(7) Spool Drive Lever
(8) Control Arm
(9) Postion Arm
(10) Feedback Arm
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