A11VLO190DRG/11R-NPD12N00 Rexroth Piston Pump 190cc 350bar

Product Overview

The A11VLO190DRG/11R-NPD12N00 (Rexroth material number R902068198) is a Bosch Rexroth A11VLO Series Series 11 swashplate-type axial piston variable displacement pump. The A11VLO Series is Rexroth’s rugged high-pressure pump line for open-circuit hydrostatic drive applications, with displacements covering 40 to 260 cm³/rev. This model delivers a maximum displacement of 190 cm³/rev.

This model features DRG control—Remote Controlled Pressure Control. The DRG pressure controller allows system pressure to be set remotely via an external remote relief valve, with stepless pressure adjustment at the control valve. 11R denotes the Series 11 design platform with Right-hand rotation (clockwise when viewed from the shaft end) configuration. NPD12N00 is the shaft, mounting flange, and port configuration code.

Key distinction between A11VLO and A11VO: The A11VLO Series features an integral built-in charge pump (impeller) in addition to the main pump, significantly enhancing self-priming capability under severe conditions such as high altitude, cold starts, and long suction lines.

As a direct OEM-equivalent replacement solution for the Bosch Rexroth A11VLO Series, this product offers complete in-situ interchangeability, strictly adhering to Rexroth’s original design specifications and mounting interface standards. Every unit undergoes 100% simulated duty-cycle testing, ensuring that key performance metrics—including volumetric efficiency, pressure-flow characteristics, and case drain flow at rated pressure and full displacement—meet or exceed original factory specifications.

Technical Specifications (Bulleted List)

• Model Number: A11VLO190DRG/11R-NPD12N00

• Rexroth Material Number (MAT. NO.): R902068198

• Brand Series: Bosch Rexroth A11VLO Series (Series 11)

• Pump Type: Swashplate Axial Piston Variable Displacement Pump (Open Circuit)

• Maximum Displacement: 190 cm³/rev

• Nominal Pressure (Rated): 350 bar (35 MPa)

• Peak Pressure (Maximum): 400 bar (40 MPa)

• Maximum Speed: 2200 rpm

• Theoretical Flow (2200 rpm, full displacement): Approx. 418 L/min

• Control Type: DRG – Remote Controlled Pressure Control

• Rotation Direction: R – Right-hand (clockwise from shaft end)

• Design Series: Series 11

• Charge Pump: Integral built-in charge pump (impeller)

• Through-Drive Capability: 100% full power through-drive for gear pumps or axial piston pumps of the same nominal size

• Flow Adjustment: Infinitely variable from qV max to qV min = 0

• External Adjustment: Pressure setting adjustable externally, even during operation

• Self-Priming Capability: Self-priming, tank-pressurized, or with charge pump

• Primary Application: Mobile equipment

• Housing Material: High-strength Cast Iron

• Hydraulic Fluid: Mineral Oil

• Weight: Approx. 104 kg

Key Technical Advantages

1. Integral Charge Pump for Enhanced Self-Priming and System Reliability
The A11VLO Series features an integral built-in charge pump (impeller) in addition to the main pump. The charge pump provides a stable boosted oil supply to the pump inlet, significantly enhancing self-priming capability under cold starts, high-altitude conditions, and long suction line scenarios—effectively preventing cavitation. Additionally, the charge pump supplies stable pilot pressure for the control circuit, ensuring control response stability and reliability.

2. DRG Remote Pressure Control for Remote Precision System Pressure Adjustment
The DRG control configuration enables remote setting of system working pressure via an external remote relief valve connected to the external control port. Operators can adjust pressure settings from a control room or cabin without approaching the pump body, with stepless pressure adjustment at the control valve. This design significantly improves operational convenience and safety—particularly valuable for applications requiring frequent system pressure adjustments or where pump installation locations are difficult to access.

3. 350 bar Rated Pressure with 400 bar Peak Capacity for Heavy-Duty Applications
The A11VLO190 delivers a rated working pressure of 350 bar (35 MPa) with peak pressures up to 400 bar (40 MPa) . At 190 cm³/rev displacement with 2200 rpm maximum speed, it outputs approximately 418 L/min theoretical flow, providing ample hydraulic power reserves for heavy-duty mobile equipment.

4. 100% Full Power Through-Drive for Flexible Multi-Pump System Expansion
The A11VLO Series features 100% full power through-drive capability as standard, allowing gear pumps or axial piston pumps of the same nominal size to be mounted directly on the rear. This design enables the A11VLO190DRG/11R-NPD12N00 to serve as the lead pump in multi-pump systems, significantly simplifying system layout and saving installation space.

5. Open-Circuit Dedicated Design with Infinitely Variable Flow Adjustment
The A11VLO Series is specifically designed for open-circuit hydrostatic drives. Output flow is proportional to drive speed and displacement, and is infinitely variable between maximum displacement and zero displacement. The pressure setting is externally adjustable—even while the pump is in operation.

6. Rugged Heavy-Duty Construction Purpose-Built for Mobile Equipment
The A11VLO Series is primarily designed for mobile equipment applications. The high-strength cast iron housing with proven rotating group design and high-precision friction pairs ensures long-term reliability under continuous high-load operating conditions. The pump is widely used in hydraulic systems for construction machinery, agricultural equipment, and mining machinery.

Application Areas

• Large Excavators: High-pressure, high-flow hydraulic power for travel and working functions

• Rotary Drilling Rigs: Meeting the dual demands of high pressure and high flow for drilling operations

• Concrete Pump Trucks: Delivering stable, continuous high-pressure hydraulic power for pumping systems

• Large Wheel Loaders: Meeting the combined flow and pressure demands of loading operations

• Mining Equipment: Roadheaders, scraper loaders operating in high-dust, high-vibration extreme environments

• Agricultural Machinery: Hydrostatic drives for large combine harvesters and forage harvesters

• Industrial & Specialized Applications: Large injection molding machines, hydraulic presses, port cranes, and other scenarios with stringent hydraulic power stability requirements

Expert Maintenance Tips

1. Model Confirmation & Pre-Installation Inspection: Prior to installation, confirm the complete model code as A11VLO190DRG/11R-NPD12N00 with Rexroth material number R902068198. This is a Series 11 right-hand rotation configuration (clockwise from shaft end)—pay special attention to matching the rotation direction with the host machine PTO. The pump weighs approximately 104 kg—ensure lifting equipment and mounting brackets have adequate capacity. Manually rotate the shaft before installation to confirm smooth, obstruction-free rotation.

2. Charge Pump Inspection and Pressure Setting: The A11VLO Series features an integral built-in charge pump. Before first start-up, ensure the charge pump suction line is unobstructed and the charge pump inlet is submerged below the oil level. After first start-up, verify charge pressure is within specification range. Low charge pressure causes sluggish control response and inadequate piston/slipper lubrication; excessive charge pressure may cause system overheating.

3. Fluid Cleanliness Control: Use high-quality mineral hydraulic oil meeting Rexroth specifications. A minimum filtration rating of ISO 18/15 is recommended. The charge pump is equally sensitive to fluid cleanliness—oil drawn by the charge pump flows directly into the pump’s high-pressure rotating components, and any contamination will accelerate wear of core components. Complete system flushing is mandatory before initial start-up.

4. DRG Remote Pressure Controller Tuning: The DRG control configuration sets pump working pressure via an external remote relief valve. During commissioning, note the following:

   • Remote Relief Valve Installation: Connect an external remote relief valve to the external control port

   • Pressure Setting: With DRG control, pump outlet pressure equals the pump compensator setting plus the remote relief valve setting

   • Pressure Range: Setting range covers 20–350 bar
     Perform initial settings under no-load conditions, then gradually increase load to target operating conditions with fine adjustments.

5. Through-Drive Installation Considerations: If additional pump stages on the rear, confirm that the additional pump’s mounting interface and torque requirements do not exceed the pump’s through-drive capacity (100% nominal torque) . Ensure coaxial alignment meets requirements during installation.

6. Initial Start-Up & Priming: Before first start-up, pre-lubricate the pump by filling the housing with clean hydraulic fluid through the case drain port. Perform a brief jog start (5–10 seconds) to confirm correct rotation direction (right-hand), and check for abnormal noise or leakage. Then start the pump and run at low load for several minutes to purge air from the pump and system lines.

7. Case Drain Port Positioning & Pressure Monitoring: During installation, ensure the drain port is positioned higher than the pump body to prevent oil starvation in the pump chamber after shutdown. The A11VLO190’s large displacement means higher case drain flow—ensure the drain line has adequate diameter to avoid excessive back pressure. Install a pressure gauge on the case drain line for real-time monitoring.