Kubota u15-3 Workshop Manual page 85

5. Control Valve (4)
Swing
Dozer
Swivel
Confluence
Service
Arm
Travel left
Supply
Travel right
Boom
Bucket
Discharge
Valve specifications
• Rated pressure: 22.6 MPa {230 kgf/cm
(Under condition of 4 million boost-up actions)
• Rated flow rate: 15 L/min
• Relief valve set pressure level
: 4.30 ~ 24.5 MPa {50 ~ 250 kgf/cm
• Overload valve set pressure level
: 4.30 ~ 24.5 MPa {50 ~ 250 kgf/cm
• Spool length spring force (manual control)
[Travel] At neutral:
At stroke end: 131 N {13.4 kgf}
[Others] At neutral:
At stroke end: 103 N {10.5 kgf}
• Maximum pilot operating pressure
: 4.90 MPa {50 kgf/cm
• Allowable tank pressure
: Below 0.98 MPa {10 kgf/cm
• Oil in use: General mineral hydraulic oil
• Operating oil temperature range
: -20 ~ +90 °C (100 °C )
• Oil contamination level: Within Class NAS9
Operating conditions
• Relief valve set pressure
P1·P2: 21.4 MPa {218
+0.49
0
P3: 18.4 MPa {188
+0.49
0
• Operating flow rate
P1·P2: 16.6 L/min
P3: 10.4 L/min
• Service port flow rate (P2+P3): 27.0 L/min
• Overload valve set pressure
A5·B5·B9: 23.3 MPa {238
+0.49
0
A8: 27.3 MPa {278
+0.49
0
B8: 17.5 MPa {178
+0.49
0
• Spool leak amount
Leak amount from A1, A8, B1 to i: Below 3 cm
Leak amount from others to i: Below 7 cm
(* 9.8 MPa {100 kgf/cm
• Spool operating pressure with pilot on (See Charac-
teristics Chart.)
: 0.37 ~ 1.96 MPa {3.6 ~ 20 kgf/cm
Po port pilot pressure: 3.50 MPa {35.7 kgf/cm
• Operating oil temperature range
: -20 ~ +90 °C (100 °C )
Figures in { } are just for your reference.
II-65
WSM U15-3
2
}
2
}
2
}
98.1 N {10 kgf}
83.4 N {8.5 kgf}
2
}
2
}
2
kgf/cm at 16.6 L/min}
+5
0
2
kgf/cm at 10.4 L/min}
+5
0
2
kgf/cm at 5 L/min}
+5
0
2
kgf/cm at 5 L/min}
+5
0
2
kgf/cm at 5 L/min}
+5
0
3
/min
2
}) (Oil viscosity 37 cSt)
2
}
3
/min
2
}