U20-3, U25-3 WSM Hydraulic system (Service section)
IV-S-22
c. Swivel performance
U20-3 U25-3 Remarks
Manufacturer Eaton Fluid Power Eaton Fluid Power
Model 25PB2PA 25PB25A1125-C
Displacement cc/rev 195 244
Max. oil flow L/min 30 30 Rated flowrate
Motor speed rpm 63.4 75.4
U20-3: at 12.4 L/min
U20-3: at 18.4 L/min
Brake valve pressure
MPa
kg/cm
2
19.6
200
16.2
165
Drain amount at lock L/min
Drain amount while rotating L/min
Swivel speed rpm 8.9 8.9 pinion/swivel teeth
3 times rotation swivel speed sec 20.2 19.5
Swivel block performance at engine
stop
mm/min 0 0
Swivel block performance at engine
running
mm/min 130 140 Bucket empty
Capable swivel rotation angle deg. 23.7 21.5 Bucket crowded
Play at the tip of bucket mm 73 73 Reference value
Brake release pressure
MPa 2 2
kgf/cm
2
20.2 20.2
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