ALA20VO60DRSC/10R-VSD24K52 Rexroth Pump 60cc 280bar Open Circuit

Product Overview

The ALA20VO60DRSC/10R-VSD24K52-S5140 (Material Number: R986120539) is a member of the Bosch Rexroth A20VO Series 10 swashplate-type axial piston variable displacement double pump family. With a maximum geometric displacement of 60 cm³/rev per rotary group, this open-circuit pump is engineered for medium-to-high pressure industrial and mobile hydraulic systems.

The A20VO Series represents Rexroth’s versatile axial piston double pump platform for open-circuit applications. Its signature “back-to-back” dual rotary group configuration integrates two independent axial piston pump assemblies within a compact housing, delivering independent dual-circuit hydraulic power. Available in five displacement sizes — 60, 95, 190, 260, and 520 cm³/rev — the series accommodates hydraulic system requirements ranging from small-to-medium equipment to ultra-heavy machinery.

Engineered as a premium drop-in replacement for Bosch Rexroth original hydraulic pumps, this unit strictly adheres to Rexroth A20VO Series 10 design standards and manufacturing specifications, ensuring complete interchangeability — mounting flange interfaces, port configurations, and control logic are fully compatible with the original OEM model, requiring zero field modification for direct replacement.

Every unit undergoes 100% simulated duty-cycle testing — full performance curve validation under rated pressure and expected operating temperature ranges — guaranteeing volumetric efficiency, response characteristics, and noise levels that meet or exceed Rexroth factory specifications.

Technical Specifications (Bulleted List)

• Model Code: ALA20VO60DRSC/10R-VSD24K52-S5140

• Material Number: R986120539

• Series: Bosch Rexroth A20VO Series 10, Swashplate Axial Piston Variable Double Pump

• Maximum Geometric Displacement (Vg max): 60 cm³/rev

• Minimum Geometric Displacement (Vg min): 0 cm³/rev

• Rated Operating Pressure: 280 bar (28 MPa)

• Peak Pressure: 315 bar (31.5 MPa)

• Maximum Speed (at Vg max): 2700 rpm

• Maximum Speed (at Vg ≤ Vg max): 3200 rpm

• Maximum Flow Rate (nmax × Vg max): 2×162 L/min (324 L/min total)

• Power (at Δp=350 bar): 135 kW

• Continuous Torque (at Δp=350 bar, Vg max): 477 Nm

• Peak Torque (at Δp=400 bar, Vg max): 602 Nm

• Moment of Inertia: 0.0113 kgm²

• Control Type: DRSC — Pressure-Flow Control

• Design Series: Series 10

• Rotation Direction: R — Clockwise (viewed from shaft end)

• Mounting Flange: SAE Standard Flange Mounting

• Circuit Type: Open Circuit

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

• Thru-Drive Capability: Supports tandem mounting of gear pumps or secondary axial piston pumps

• Weight: Approx. 44 kg (depending on configuration)

Key Technical Advantages

1. Back-to-Back Dual Pump Configuration & Superior Power Density

The A20VO Series features a unique “back-to-back” dual rotary group architecture, with two independent axial piston pump assemblies sharing a common housing and drive shaft. This design delivers independent dual-circuit hydraulic power within a compact footprint, achieving power density far exceeding single-pump solutions. With 60 cm³/rev per rotary group, total flow reaches 324 L/min. Thru-drive capability supports tandem mounting of additional gear pumps or secondary axial piston pumps, significantly simplifying complex hydraulic system layouts.

2. DRSC Pressure-Flow Compound Control

This model is equipped with DRSC (Pressure-Flow Control) regulation, integrating both pressure control and flow control functions. The system automatically adjusts pump output flow and pressure based on load demand, achieving “on-demand oil supply” — automatically reducing displacement during standby or light-load conditions to minimize energy losses and system heat generation. The pressure control range spans 35 to 210 bar, with a standard setting of 210 bar, meeting the vast majority of industrial and mobile application requirements.

3. Mature Modular Platform & Proven Component Heritage

The A20VO Series inherits Rexroth’s field-proven mature technology, with core rotating assemblies derived from the proven designs of the A11VO (RE 92500), A10VO/53 (RE 92703), and A4VSO (RE 92050) variable pump platforms. This modular design philosophy ensures high reliability, extended service life, and highly predictable parts availability.

4. Constant Power Control & Engine Protection

Integrated constant power control continuously monitors system load and automatically adjusts displacement to maintain engine operation within the most economical power range. This not only reduces fuel consumption but also effectively prevents engine stall due to overload, protecting the entire powertrain system.

5. Low Noise & Smooth Operation

Optimized swashplate angle transition geometry and nine-piston configuration effectively reduce output flow pulsation and pressure fluctuations. Output flow is proportional to drive speed and pump displacement, with stepless adjustment between maximum and zero displacement. This continuous stepless regulation ensures precise synchronization between actuator speed and operational commands for smooth, impact-free operation.

6. Complete Drop-In Interchangeability & Standardized Interfaces

Strictly manufactured to original Rexroth A20VO Series 10 micro-metric factory blueprints. SAE standard mounting flanges and port configurations align flawlessly with original factory specifications. Field replacement requires zero piping modifications or control logic changes, dramatically minimizing equipment downtime.

Application Areas

• Wheel Loaders — JCB 426/427/436 Series

• Mobile Crushers — Kleemann MC100R

• Road Construction Machinery — Wirtgen W50/W100 milling machines, Bomag rollers, Dynapac/Vogele pavers

• Material Handling Equipment — Terex Fuchs MHL320

• Industrial Power Units

• Agricultural Machinery Hydraulics

• Construction Equipment Hydraulics

Expert Maintenance Tips

1. Case Fill Before Start-up

Prior to first start-up, fill the pump housing with clean hydraulic fluid through the case drain port to ensure complete pre-lubrication of all bearings and rotating components. For the A20VO Series “back-to-back” dual pump configuration, pay special attention to ensuring both rotary groups receive adequate lubrication.

2. DRSC Control Setting & Calibration

DRSC pressure-flow control settings should be adjusted after the pump reaches operating temperature and the system is fully purged. The pressure control range spans 35 to 210 bar, with a standard setting of 210 bar. Use a pressure gauge with accuracy class 1.6 or better for setting verification. Adjust slowly to avoid pressure or flow overshoot.

3. Fluid Cleanliness Management

A20VO Series pumps are precision hydraulic components sensitive to fluid contamination. Maintain system fluid cleanliness at ISO 18/16/13 or better. Use return-line filters with minimum 10μm absolute rating (β₁₀≥100) and conduct regular fluid sampling analysis (recommended every 500 operating hours).

4. Viscosity & Temperature Monitoring

Ensure operating fluid viscosity remains within the recommended range. For cold starts, only apply load after fluid temperature reaches normal operating range. Install continuous oil temperature monitoring to ensure fluid temperature does not exceed 80°C.

5. Scheduled Inspection & Seal Replacement

Perform comprehensive performance testing every 2000 operating hours or annually (whichever comes first), including volumetric efficiency testing, DRSC control response time verification, and case drain leakage assessment. Always use genuine Rexroth service kits (material numbers beginning with R902/R909/R910) when replacing seals, and verify that seal materials are compatible with the system fluid type.

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