A10VG45NVDM1/10L-NSC10F045S-S Rexroth Pump 46cc 300bar

Product Overview

The A10VG45NVDM1/10L-NSC10F045S-S (R909607994) is a Bosch Rexroth A10VG Series size 45 closed-circuit axial piston variable pump featuring a swashplate design with a displacement of 46 cm³/rev. Engineered specifically for hydrostatic closed-circuit transmissions, the pump delivers output flow proportional to drive speed and displacement, with infinitely variable flow control achieved through swashplate angle adjustment from zero to maximum. Flow direction changes smoothly when the swashplate moves through the neutral position, enabling bidirectional operation without additional directional valves. An integrated charge pump with 8.6 cm³ displacement supplies replenishing and control oil to the closed loop, eliminating the need for external charge pump piping. The NVDM1 control configuration belongs to the electro-proportional control category, providing continuous electronic displacement regulation via proportional solenoids. Two pressure relief valves on the high-pressure ports protect the hydrostatic transmission from overload and also serve as boost valves.

Every unit is manufactured to exact Rexroth OEM dimensional and interface specifications, ensuring true drop-in interchangeability. Each pump undergoes 100% simulated operating condition testing before shipment, covering rated pressure loading, displacement mechanism response, charge pressure retention, and housing sealing integrity.

Technical Specifications 

• Model: A10VG45NVDM1/10L-NSC10F045S-S

• Rexroth Material Number: R909607994

• Series: Rexroth A10VG Series 10 (Closed Circuit)

• Pump Type: Axial piston variable pump, swashplate design

• Displacement (Vg max): 46 cm³/rev

• Charge Pump Displacement (Vg Sp): 8.6 cm³ (at p = 20 bar)

• Nominal Pressure (pnom): 300 bar (30 MPa)

• Peak Pressure (pmax): 350 bar (35 MPa)

• Continuous Maximum Speed (nmax continuous): 3,300 rpm

• Limited Maximum Speed (nmax limited): 3,550 rpm

• Intermittent Maximum Speed (nmax interm.): 3,800 rpm

• Minimum Speed (nmin): 500 rpm

• Theoretical Flow at 3,300 rpm (Vg max): 152 L/min

• Maximum Power (at Δp = 300 bar, 3,300 rpm): 75.9 kW

• Maximum Torque (at Δp = 300 bar, Vg max): 220 N·m

• Moment of Inertia for Rotary Group: 0.0033 kg·m²

• Housing Volume: 0.75 L

• Weight: Approx. 27 kg

• Mounting Flange: SAE standard flange

• Fluid Requirement: HLP mineral oil per DIN 51524

Key Technical Advantages

1. Purpose-Built for Hydrostatic Closed-Circuit Transmissions: The A10VG series is specifically developed as a swashplate-type variable pump for hydrostatic closed-circuit drives. Output flow is proportional to drive speed and displacement, with infinitely variable adjustment from zero to maximum. Smooth flow direction reversal occurs when the swashplate passes through the neutral position, enabling frequent forward/reverse cycling in mobile machinery without external directional valves.

2. Integrated Charge Pump System: An 8.6 cm³ charge pump is integrated into the pump housing, continuously replenishing the low-pressure side of the closed loop and maintaining system cooling circulation. The charge pump also supplies pilot oil to the control circuit, with maximum charge pressure limited by a built-in charge pressure relief valve. This integrated design simplifies hydraulic circuit plumbing and reduces external leak points.

3. Integrated High-Pressure Relief Protection: Two pressure relief valves on the high-pressure ports automatically unload the system when pressure exceeds the set value, protecting both the pump and motor from overload damage. These relief valves also function as boost valves, introducing fluid from the charge circuit when low-side pressure is insufficient, maintaining proper closed-loop operation.

4. High Power Density in a Compact Package: Delivers 300 bar nominal pressure and 75.9 kW maximum power output in a 46 cm³ frame size. The approximately 27 kg housing weight suits mobile machinery with strict installation envelope and weight constraints.

5. Wide Speed Range with Precise Control: Supports a continuous operating range of 500–3,300 rpm, with intermittent operation up to 3,800 rpm. The NVDM1 electro-proportional control configuration provides continuous electronic displacement regulation via proportional solenoids, with fast response and high control accuracy for integration into modern electro-hydraulic systems.

Application Areas

• Road Construction: Bomag BW177AD, Dynapac CC5220, Hamm HD120, Volvo DD140 compactors

• Asphalt Paving: Vogele Super 2100-3/2200-3 series pavers

• Road Milling: Wirtgen W2000/W2200 cold planers

• Agricultural Machinery: Claas Lexion 570, John Deere T660, New Holland CR8.90, Case IH 2388 combine harvesters

• Specialty Mobile Equipment: Auxiliary hydraulic systems, hydraulic fan drives, Sunward/Locust/JCB/CASE loader hydraulic drives

Expert Maintenance Tips

1. Shaft Alignment and Flange Connection: Concentricity deviation between the pump and drive shaft must be less than 0.05 mm, with angular deviation less than 0.25°. The A10VG45 uses an SAE standard mounting flange. Tighten flange bolts in a diagonal sequence to avoid uneven flange face loading and housing deformation.

2. Initial Start-Up Filling and Bleeding: Pre-fill the pump housing with clean hydraulic fluid through the charge port before installation. Start the prime mover at the lowest rotational speed with the pump operating without load, and observe a steady oil flow from the case drain port free of bubbles. Once bleeding is complete, gradually apply load and verify that working pressure rises as expected.

3. Charge Pressure Verification: After initial startup or repair, connect a pressure gauge to the charge port (port G) to verify charge pressure. The standard charge pressure setting is 20 bar. Abnormal charge pressure may cause sluggish control response or inadequate lubrication of rotating components. Also verify that the high-pressure relief valve pressure cut-off value is within the specified range.

4. Mechanical and Hydraulic Zero Stroke Verification: After repair, check the mechanical and hydraulic zero stroke settings of the variable pump before restart. Mechanical zero stroke deviation will cause the swashplate to produce a small displacement output at the neutral position, resulting in closed-loop drift when no command is given.

5. Fluid Cleanliness Management: The A10VG series is sensitive to fluid contamination. System filtration should achieve β10 ≥ 75 (10 μm filtration efficiency ≥ 98.7%). Use HLP mineral oil per DIN 51524 with a viscosity range of 10–1000 mm²/s. Replace filter elements after the first 500 operating hours, then every 1,000 hours or annually thereafter.

6. Case Drain Line Configuration: The case drain line must return directly to the reservoir, not shared with other return lines, and case drain backpressure must not exceed 2 bar. The drain line inner diameter must be sufficient to ensure unobstructed drainage during cold-start high-viscosity conditions.