Kubota WSM L3560, Workshop Manual

Page: 546 / 801

HYDRAULIC SYSTEM
L3560, L4060, L4760, L5060, L5460, L6060, WSM
8-M17
Down
1. When the hydraulic control lever is set to the
"DOWN"
position, the spool (3) moves to the right, which forms oil
passages between passage 1 (7) and
A1
port, and between
B1
port and
PB
passage 1 (4).
2. As the oil passage from the neutral passage 1 (5) to the
PB
passage 1 (4) is closed by the spool (3), the
pressure-fed oil from the
P
port opens the load check valve (6) and flows through the notched section of the spool
(3) and
A1
port to retract the boom cylinder (8).
3. Return oil from the boom cylinder (8) flows from the
B1
port through the passage in the spool (3) and
PB
passage
1 (4) to the bucket control section (2).
9Y1210824HYM0020US0
(1) Boom Control Section
(2) Bucket Control Section
(3) Spool
(4)
PB
Passage 1
(5) Neutral Passage 1
(6) Load Check Valve
(7) Passage 1
(8) Boom Cylinder
P: Pump Port
T: Tank Port
A1: A1 Port
(To Boom Cylinder)
B1: B1 Port
(From Boom Cylinder)
PB: Power Beyond Port
a:
Low Pressure
b: High Pressure
KiSC issued 03, 2016 A