0102030405
China Suppliers Factory Replacement for Rexroth LA4VSO Series Axial Piston Variable Hydraulic Pumps
Features
Swashplate axial piston pump.
Adjust the angle of swashplate to realize the stepless variable.
Good suction characteristic.
Have the structural design of compact, light weight, low noise characteristics.
The sensitivity of control system.
Flow is proportional to the drive speed and to the displacement.
Nominal pressure reach to 35 Mpa.
Long service life, high-precision bearings.
Hydrostatic balance slipper, improve the life of pump.
With swashplate angle indicator.
Model Designation
| Hydraulic | L |
|---|
Hydraulic Fluid
| Mineral oils | No mark |
| HF; HFB and HFC-Mediums | E |
Axial piston unit
| Variable displacement pump, industrial uses | A4VS |
Type of operation
| Pump, open circuits | O |
Size
| Displacement Vg max(ml/r) | 40 | 71 | 125 | 180 | 250 | 355 | 500 |
|---|
Mode of operation
| Control Type | 40 | 71 | 125 | 180 | 250 | 355 | 500 | Code |
|---|---|---|---|---|---|---|---|---|
| Pressure control | √ | √ | √ | √ | √ | √ | √ | DR... |
| Power control with Hyperbolic open, curve | √ | √ | √ | √ | √ | √ | √ | LR... |
| Manual control | √ | √ | √ | √ | √ | √ | √ | MA... |
| Electronic control | √ | √ | √ | √ | √ | √ | √ | EO... |
| Hydraulic control, pilot pressure dependent | √ | √ | √ | √ | √ | √ | √ | HD... |
Series
| Series 10 | √ | √ | - | - | - | √ | - | 10 |
| Series 22 | - | - | √ | √ | √ | √ | √ | 22 |
| Series 30 | - | √ | √ | √ | √ | √ | √ | 30 |
Direction of rotation (With view on shaft end)
| Clockwise | R |
| Counter clockwise | L |
Seals
| NBR Nitrile rubber | P |
| FKM Fluoro-rubber | V |
Shaft end
| Keyed parallel shaft | P |
| Splined shaft | Z |
Mounting flange
| ISO 4 hole | 40 | 71 | 125 | 180 | 250 | 355 | 500 | Code |
|---|---|---|---|---|---|---|---|---|
| Mounting Flange Compatibility | √ | √ | √ | √ | √ | √ | - | B |
Service ports
| Port Configuration | 40 | 71 | 125 | 180 | 250 | 355 | 500 | Code |
|---|---|---|---|---|---|---|---|---|
| Port B and port S 90°offset; Auxiliary pressure port B1 Metric fixing screws | √ | √ | √ | √ | √ | √ | √ | 13 |
| Port B and S 90°offset; Pressure connection B1 connected by flange | √ | √ | √ | √ | √ | √ | √ | 25 |
Through drive
| Auxiliary Pump Option | 40 | 71 | 125 | 180 | 250 | 355 | 500 | Code |
|---|---|---|---|---|---|---|---|---|
| Without auxiliary pump, without through drive | √ | √ | √ | √ | √ | √ | - | N00 |
Technical Data
Performance parameters (These figures do not consider mechanical and volumetric efficiency)
| Size | Unit | 40 | 71 | 125 | 180 | 250 | 355 | 500 | |
|---|---|---|---|---|---|---|---|---|---|
| Displacement (Vg max) | cm³/r | 40 | 71 | 125 | 180 | 250 | 355 | 500 | |
| Max. speed (n max1) | rpm | 2600 | 2200 | 1800 | 1800 | 1500 | 1500 | 1320 | |
| Max. output flow | n=n max | L/min | 104 | 156 | 225 | 324 | 375 | 532 | 600 |
| n=1500rpm | L/min | 60 | 107 | 186 | 270 | 375 | 532 | － | |
| Max. power | n=n max | kW | 61 | 91 | 131 | 189 | 219 | 310 | 385 |
| n=1500rpm | kW | 35 | 62 | 109 | 158 | 219 | 310 | － | |
| Max. torque | △P=35MPa | N.m | 223 | 395 | 696 | 1002 | 1391 | 1976 | 2783 |
| △P=10MPa | N.m | 64 | 113 | 199 | 286 | 398 | 564 | 795 | |
| Weight (approximately) | kg | 40 | 54 | 87 | 103 | 186 | 206 | 318 | |
Outline drawing
| Size Parameters | Unit | 40 | 71 | 125 | 180 | 250 | 355 | 500 |
|---|---|---|---|---|---|---|---|---|
| Control moving distance | mm | 14.2 | 17.3 | 20.7 | 20.7 | 25.9 | 25.9 | 32.6 |
| Control area | cm² | 3.9 | 6.4 | 9 | 9 | 14.4 | 14.4 | 18.8 |
| Control volume | cm³ | 5.5 | 11 | 18.7 | 18.7 | 37.3 | 37.3 | 61.4 |
| Min. control pressure | MPa | 3 | 3 | 5 | 5 | 5 | 5 | 5 |
| Control time 20MPa pressure | s | 0.1 | 0.1 | 0.1 | 0.1 | 0.2 | 0.2 | 0.8 |
(2) EO Hydraulic displacement control HD
Outline:
In the EO electric control work, the pump flow could set by proportion direction valve. Meanwhile, pump's current flow through inductance type position transducer feedback signal.
This pump could reset the cylinder's zero position by the spring controls in the situation of normal pressure. Do not reset at high-pressured work. Simultaneously, in order to reduce controls cylinder's loss of flow, all size of hydraulic pressure fluid cylinder cavity is sealed.
Outline drawing
| Control Cylinder Parameters | Unit | 40 | 71 | 125 | 180 | 250 | 355 | 500 |
|---|---|---|---|---|---|---|---|---|
| Control cylinder’s moving distance | mm | 14.2 | 17.3 | 20.7 | 20.7 | 25.9 | 25.9 | 32.8 |
| Control cylinder area | cm² | 8.1 | 12.6 | 18.1 | 16.1 | 28.3 | 28.3 | 38.2 |
| Control volume | cm³ | 11.4 | 21.5 | 37.5 | 37.5 | 73.2 | 73.2 | 124.5 |
| Min. control pressure | MPa | 10 | 10 | 10 | 12.5 | 12.5 | 12.5 | 15 |
| Max. control pressure | MPa | 31.5 | 31.5 | 31.5 | 31.5 | 31.5 | 31.5 | 31.5 |
| Control time | s | 0.1 | 0.12 | 0.2 | 0.2 | 0.25 | 0.25 | 0.3 |
(3) LR Power control LR
Outline:
At the very beginning, the control scope could use the mechanical way to set, the setting value scope could use the spring and screw to adjust. When the pressure decreases, we could adjust spring and enter its starting position, the setting range of preset value: 3.5MPa--35MPa. The smallest and the biggest angle of rotation's limit can use the mechanical way, adjustment to Vg max 50%.
Frequently Asked Questions
What is the nominal operating pressure of this swashplate axial piston pump?
The pump features a high nominal operating pressure that can reach up to 35 MPa, making it suitable for heavy-duty industrial applications.
What types of hydraulic fluids are compatible with this pump series?
This series is compatible with standard mineral oils. For fire-resistant fluids like HF, HFB, and HFC mediums, versions marked with the designator "E" are available.
What displacement sizes are offered for the LA4VSO equivalent pump?
The pump is available in seven nominal displacement sizes: 40, 71, 125, 180, 250, 355, and 500 cm³/r.
How does the EO electronic displacement control operate?
Under EO electric control, the pump flow rate is adjusted via a proportional directional valve. An inductance-type position transducer provides feedback on the actual cylinder stroke position to maintain control accuracy.
What are the adjustment limits for the LR power control option?
The LR power control allows mechanical adjustment of the starting operating point using a spring and screw mechanism within a range of 3.5 MPa to 35 MPa. The minimum and maximum swashplate angle limits can be mechanically set down to 50% of maximum displacement (Vg max).