U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-53
b. Control valve
[1] Mounting and dismounting the valve
(1)
(1) (7) (4)
(5)(4)
(2)
(2)
(13)
(1)
(12)
(16)
(16)
(2)
(11)(5)(10)(9)
(14) (15)
(8)
(1)
(7)
(2)
(6)
(3)
Identification of control valve
Marking
U20-3 EU: Blue
U25-3 EU: None
* The U25-3 EU
nameplate is
colored red.
Color of marking
U20-3 EU Blue
None
U25-3 EU
No. Part No. Part name
Valve, assembly (Control)
U20-3 EU (Blue)
U25-3 EU (None)
Valve, assembly (Control)
Elbow pipe joint (3-3-75)
Pipe joint (L. G3/8-G3/8)
Flange-faced elbow
Pipe joint (T. G1/2-G3/8)
Pipe joint (L. G3-G3-R1)
Pipe joint (L. G3/8-G3/8)
Pipe joint (L. F3/8-H3/8)
Travel right back, P2, travel left back
Valve, assembly (Check)
Straight pipe joint (3-3-35)
Pipe joint (S. G3/8-G3/8)
Straight pipe joint (3-3-65)
Pipe joint (L. G1/2-G3/8)
Pipe joint (L. G3-G3)
Straight pipe joint
Pipe joint (S. F3/8-F1/4)
None
None
None
Pipe joint (L. G1/4-G1/4)/Pilot
T-pipe joint (F2)
Straight pipe joint (4-4-100)
Pipe joint (L. G3/8-16)
Flange-faced elbow
Pipe joint (T. G3/8)
Pipe joint (L. G1/2-G3/8)
Pipe joint (S. G3/8-16)
Q’ty Remarks
Remarks
No. Part No. Part name Q’ty
Remarks
No. Part No. Part name Q’ty
Swivel left
Swivel right
(1) Mount each rod and control valve as
shown in the figure.
(2) Tightening torque of control valve
mounting bolt (1):
48.1 ~ 55.9 N-m (4.9 ~ 5.7 kgf m)
(3) Tightening torque of bracket (control
valve) mounting bolt (4):
77.5 ~ 90.2 N-m (7.9 ~ 9.2 kgf m)
(1) Rod (2) Bottom (3) Left
(4) Back (5) Boom (6) Communicating valve
(7) Dozer (8) Swing (9) Swivel
(10) Service (11) Travel Left (12)Travel right
(13) Bucket (14) Right (15) High
(16) Front
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