Kubota WSM STa-30, Руководство по ремонту

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9-M10
ST
α
-30, ST
α
-35, WSM HYDRAULIC SYSTEM
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When Bi-speed Turn is actuating
1. When Bi-speed turn is actuated and pressure rises,
the plunger (6) moves to the left, reducing the
opening area of portion B, and widening the opening
area of portion A. Therefore, there is no change in the
controlled flow to the PF port (2). This is because the
plunger moves in accordance with the balancing of
the pressure difference between the ends of the
orifice and spring force, controlling the opening areas
of the portion A (3) and B (8).
2. The pressure in the P port (9) side is higher than the
working pressure of the PF port (2) by the pressure
difference between the ends of the orifice (1). When
position control is not in operating, the oil of EF port
(7) side is a free flow.
W1015371
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When Position Control is actuating
1. When position control is actuated and the Bi-speed
turn is not, the pressure difference between the end
of the orifice (1) becomes large, and causes the
plunger to move the right.
2. Therefore, the opening area of portion A (3) becomes
smaller to automatically prevent any excessive flow to
the PF port (2) side.
W1015516
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When Position Control, Bi-speed Turn are
actuating
1. When the working pressures of the PF port (2) side
and EF port (7) side circuits rise simultaneously, the
opening areas of portion A (3) and B (8) are
automatically controlled by balancing of the pressure
difference between the ends of the orifice (1) and the
spring (4) force to maintain the control flow at
constant.
W1015661
(1) Orifice
(2) PF Port
(3) Portion A
(4) Plunger Spring
(5) Damper Orifice (6) Plunger
(7) EF Port
(8) Portion B
(9) P Port
(1) Orifice
(2) PF Port
(3) Portion A
(4) Plunger Spring
(5) Damper Orifice (6) Plunger
(7) EF Port
(8) Portion B
(9) P Port
(1) Orifice
(2) PF Port
(3) Portion A
(4) Plunger Spring
(5) Damper Orifice (6) Plunger
(7) EF Port
(8) Portion B
(9) P Port
KiSC issued 11, 2006 A