Kubota WSM L3560, Workshop Manual

Page: 550 / 801

HYDRAULIC SYSTEM
L3560, L4060, L4760, L5060, L5460, L6060, WSM
8-M21
Dump 2
1. When the hydraulic control lever is set to the
"DUMP 2"
position, the spool (4) of the bucket control section (2)
moves to the right of the bucket control section (2) moves further to the right from the
"DUMP 1"
position, which
forms oil passages between passage 2 (8) and
A2
port, and between
B2
port and
T
port.
2. The pressure-fed oil from the
P
port flows to the neutral passage 2 (5) through the boom control section (1) and
PB
passage 1 (3). As the oil passage from the neutral passage 2 (5) to the
PB
passage 2 (6) is closed by the
spool (4), this oil opens the load check valve (7) and flows through the notched section of the spool (4) and
B2
port to extend the bucket cylinder (9).
3. Return oil from the bucket cylinder (9) flows to the transmission case through the
B2
port and
T
port.
9Y1210824HYM0024US0
(1) Boom Control Section
(2) Bucket Control Section
(3)
PB
Passage 1
(4) Spool
(5) Neutral Passage 2
(6)
PB
Passage 2
(7) Load Check Valve
(8) Passage 2
(9) Bucket Cylinder
P: Pump Port
T: Tank Port
PB: Power Beyond Port
A2: A2 Port
(To Bucket Cylinder)
B2: B2 Port
(From Bucket Cylinder)
a: Low Pressure
b: High Pressure
KiSC issued 03, 2016 A