A11VLO190LE2S/11L-NZD12K02P Rexroth Variable Displacement Piston Pump
A11VLO190LE2S/11L-NZD12K02P Rexroth Variable Displacement Piston Pump – Technical Specification
> A11VLO series: Axial piston variable pump for open circuit, swashplate design, used in mobile machinery (concrete pump, rotary drilling rig, tunneling machine, etc.)
✅ Model Code Explanation
A11VLO190LE2S/11L-NZD12K02P
– A11VLO: A11V series, open circuit (LO) axial piston variable pump (VO also for open circuit; LO refers to control configuration)
– 190: Nominal displacement 190 cm³/r (cc/rev)
– LE2S: Control type: LE = electro-proportional displacement control, with pressure cut-off; S = additional function code
– 11: 11th generation (11X series)
– L: Left-hand rotation (counterclockwise viewed from drive end); R = right-hand rotation
– NZD12: Port flange, charge pump and sealing configuration
– K02: Control oil port version
– P: Seal material, P = NBR nitrile rubber seal (V = FKM fluorocarbon rubber)
> ⚠️ LE2S: Electro-proportional control pump. 0~10V electric signal adjusts swashplate angle for stepless output flow regulation. Built-in pressure cut-off protection: when pressure reaches set value, displacement is reduced to limit maximum system pressure.
📋 Main Technical Parameters
| Item | Value | Remarks |
|---|---|---|
| Construction | Swashplate axial piston variable pump | Open circuit |
| Nominal displacement | 190 cm³/r | Continuously variable from 0 to 190 cc |
| Continuous rated pressure | 350 bar (35 MPa) | Long-term working pressure |
| Peak pressure | 400 bar (40 MPa) | Short-time shock pressure; continuous operation at this pressure is prohibited |
| Recommended operating speed | 1800 rpm | Common working condition |
| Max permissible speed | 2100 rpm at full displacement; 2500 rpm with boosted suction | Avoid sustained operation above 2100 rpm under self-suction to prevent cavitation |
| Theoretical max flow @1800 rpm | 342 L/min | 190×1800÷1000=342 L/min (ignoring volumetric efficiency) |
| Volumetric efficiency | ≥94% (rated condition) | New pump, clean hydraulic oil at 40℃ |
| Overall efficiency | Approx. 88~91% | Rated working point |
| Input torque @350 bar, full displacement | ≈1075 N·m | |
| Pump weight | Approx. 104 kg | Excludes external valve block, reference value |
| Rotation direction | L: Left-hand (counterclockwise from drive end) | Marked /11L in model |
| Seals | NBR nitrile rubber (code P) | For mineral HLP hydraulic oil; not compatible with synthetic ester or phosphate ester fluids |
| Hydraulic fluid | Mineral HLP hydraulic oil | Recommended viscosity: 16~36 mm²/s during operation; ≥10 mm²/s for cold start; ≤100 mm²/s maximum |
| Oil temperature range | -20℃ ~ +80℃, recommended 40~60℃ | Continuous temperature >70℃ accelerates seal aging |
| Filtration requirement | NAS class 8 or ISO 4406 18/15; β7≥200 recommended | Electro-proportional control is highly sensitive to fluid cleanliness! |
| Drive | SAE standard spline shaft, through-drive design (can be stacked with auxiliary pump at rear end) | Through-drive option |
🎛️ LE2S Electro-proportional Control Description
1. Control signal: 0~10VDC analog voltage signal. 0V → minimum displacement; 10V → max displacement 190cc
2. Built-in pressure cut-off (high-pressure protection): Once system pressure hits cutoff setting, swashplate swings back to reduce displacement for overload protection (NOT an overflow valve).
3. Control oil: Internal / external control. NZD configuration uses external pilot oil requiring independent pilot pressure.
4. Response time: Tens of milliseconds. Suitable for continuous stepless flow regulation. Widely used as main pump for concrete pumps and rotary drilling rigs.
⚠️ Operation Precautions
1. Limited self-priming capability: At full displacement & high speed, suction vacuum shall not exceed 0.08 bar. Auxiliary suction boosting is recommended for large flow conditions to prevent cavitation.
2. Electro-proportional control is sensitive to oil contamination; dirty fluid easily causes proportional valve sticking and signal drift.
3. 400 bar peak pressure is only permitted for short transient shocks. Long-term continuous operation above 350 bar will drastically shorten service life.
4. Left-hand rotation (L). Verify rotation direction of motor/engine before ordering & installation. Wrong rotation will directly destroy valve plate.
5. For non-flammable fluids, fluorocarbon rubber seals (code V) must be selected instead.
📌 Typical Applications
Concrete trailer pump / truck-mounted concrete pump, rotary drilling rig, tunnel boring machine and large tracked mobile machinery, electro-proportional flow regulated main pump for open hydraulic circuits.
> Note: General parameters from Rexroth A11VLO 11X series datasheet. The R-coded material number on nameplate is the unique OEM identifier. The above data are standard sample values. For acceptance purposes, refer strictly to the original Rexroth PDF datasheet.
