Kubota U25-3 Repair Manual

U20-3, U25-3 WSM Hydraulic system (Mechanism section)
IV-M-5
b. Performance curve
U20-3
Type: PVD-OB-24P-6G3-4649A
P
1
, P
2
P
3
P
P
Operating Pressure
MPa 21.6 20.6 3.9
kg / cm
2
220 210 40
Displacement cc / rev 10.5 5.8 2.7
Discharge Capacity L / min 23.0 12.8 5.9
P
3 shift pressure
MPa 0.5 → 20.6
kg / cm
2
5 → 210
Operating RPM 2,200
Rotating direction Clockwise, viewed from input shaft side
Weight about 16kg
Test conditions Legend Remarks
Hydraulic tempt. 50 ± 5°C
Input shaft rpm 2,200 rpm
q
3
5.8 cc/rev
q
4
2.7 cc/rev
P
4
40 kgf/cm
2
0
0 100 200 300 400 480
2
4
6
8
10
12
14
16
18
20
22
0
2
4
6
8
10
12
14
16
18
20
22
10.45 cc/rev P3=210kgf/cm
2
P3=5kgf/cm
2
10.3 cc/rev
P
1+P2=100kgf/cm
2
10 cc/rev
P
1+P2=240kgf/cm
2
7 cc/rev
P
1+P2=350kgf/cm
2
5.2 cc/rev
P
1+P2=440kgf/cm
2
3.1 cc/rev
P
1+P2=440kgf/cm
2
7 cc/rev
P
1+P2=210kgf/cm
2
Pressure P1+P2 (kgf/cm
2
)
Discharge Capacity: q
1
=q
2
(cc/rev)
U20-3

Kubota U25-3 Specifications

General

Brand	Kubota
Model	U25-3
Category	Excavators
Language	English