Kubota U25-3 Repair Manual

U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-1
IV. Hydraulic system (Service section)
A. Troubleshooting............................................................................................................................ IV-S-2
a. Common Circuit ......................................................................................................................IV-S-2
b. Hydraulics ................................................................................................................................IV-S-4
c. Pump ........................................................................................................................................IV-S-6
d. Motor ........................................................................................................................................IV-S-7
e. Swivel performance ...............................................................................................................IV-S-8
f. Traveling performance ........................................................................................................ IV-S-14
B. Specifications ............................................................................................................................ IV-S-18
a. Pump ..................................................................................................................................... IV-S-18
b. Relief valve ........................................................................................................................... IV-S-20
c. Swivel performance ............................................................................................................ IV-S-22
d. Traveling performance ........................................................................................................ IV-S-23
e. Cylinder ................................................................................................................................. IV-S-24
C. Testing ........................................................................................................................................ IV-S-29
a. Pump flow ............................................................................................................................. IV-S-29
b. Pressure measurement ...................................................................................................... IV-S-30
c. Drain measurement ............................................................................................................ IV-S-36
d. Measurement of block performance ................................................................................. IV-S-38
e. Operating speed .................................................................................................................. IV-S-39
f. Straight travel performance ............................................................................................... IV-S-41
g. Control and Traveling lever operating force .................................................................... IV-S-41
h. Control and Traveling lever stroke .................................................................................... IV-S-41
i. Cylinder natural fall amount ............................................................................................... IV-S-42
j. Control and Traveling lever operating force .................................................................... IV-S-42
k. Lever stroke .......................................................................................................................... IV-S-42
D. Disassembling and Assembling .............................................................................................. IV-S-43
a. Pump ..................................................................................................................................... IV-S-43
b. Control vavle ........................................................................................................................ IV-S-53
C. Pilot vale ............................................................................................................................... IV-S-64
d. Swivel motor ......................................................................................................................... IV-S-78
e. Rotary joint (Swivel joint) .................................................................................................... IV-S-94
f. Traveling motor .................................................................................................................... IV-S-98
1) General cautions in disassembling/reassembling ........................................................ IV-S-102
b. Cylinder ............................................................................................................................... IV-S-128
h. Hydraulic hose ................................................................................................................... IV-S-133
i. Other hydraulic valve ........................................................................................................ IV-S-140

Kubota U25-3 Specifications

General

Brand	Kubota
Model	U25-3
Category	Excavators
Language	English