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A20VO520 A20VO260 A20VO190 A20VO95 A20VO60 Double Pump | 350 bar

Model Number

ALA20VO520LR3DN/10L-VZH26K99 -S2489

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Product Description

Product Overview

The A20VO series represents the flagship product line of axial piston variable double pumps within the Bosch Rexroth hydraulic transmission platform, featuring the proven swashplate axial piston design with two axial piston rotary groups arranged in a back-to-back configuration sharing a common suction port. This series is purpose-engineered for open-circuit hydrostatic transmission systems, widely deployed across both mobile and stationary industrial applications.

This product covers five displacement models — A20VO60, A20VO95, A20VO190, A20VO260, and A20VO520 — with the A20VO520 serving as the flagship model. The complete model code is ALA20VO520LR3DN/10L-VZH26K99 -S2489 (material number R902564829), featuring LR (constant power / load-sensing) control.

Technical Note: In the model code “ALA20VO520”, the prefix “AL” indicates a charge pump-equipped configuration, with “A20VO520” as the base pump model identifier.

100% Interchangeability Guarantee: Our pumps strictly adhere to Bosch Rexroth A20VO Series 10 original mounting dimensions and port layouts, enabling drop-in replacement without modifications. Every unit undergoes 100% simulated duty-cycle testing under actual load conditions to validate performance parameters before shipment, ensuring immediate reliability upon installation.

Quality & Manufacturing Standards: The housing is manufactured from high-strength cast iron. The series integrates proven components from the A11VO (RE 92500), A10VO/53 (RE 92703), and A4VSO (RE 92050) variable pump platforms. Critical tribological pairs (cylinder barrel/valve plate, pistons/slippers) are precision-ground and heat-treated. The compact dual-rotary-group design with shared suction port delivers exceptional power density and system layout flexibility.

Technical Specifications 

Series General Specifications (A20VO Series 10):

  • Design: Swashplate axial piston variable double pump

  • Circuit Type: Open circuit

  • Rotary Group Configuration: Two back-to-back axial piston rotary groups sharing a common suction port

  • Displacement Control: Infinitely variable from maximum to zero

  • Output Flow: Proportional to drive speed and displacement, infinitely variable

  • Charge Pump Configuration: Available for A20VO190/A20VO260

  • Through-Drive: Available for mounting gear pumps or additional axial piston pumps

  • Priming Options: Self-priming, pressurized reservoir, or charge pump

  • Control Options: Multiple (DR pressure control, LR load-sensing/constant power, HD constant power, EP electro-proportional, etc.)

A20VO60:

  • Displacement (Vg max): 60.0 cm³/rev

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

  • Rated Pressure: 250 bar

  • Peak Pressure: 315 bar

  • Maximum Speed @ Vg max: 2,700 min⁻¹

  • Maximum Speed @ Vg ≤ Vg max: 3,200 min⁻¹

  • Maximum Flow (@ nmax & Vg max): 2 × 162 L/min

  • Power (@ qv max & Δp=350 bar): 135 kW

  • Continuous Torque (@ Δp=350 bar): 477 N·m

  • Peak Torque (@ Δp=400 bar): 602 N·m

  • Moment of Inertia: 0.0113 kg·m²

  • Mass (approx.): 44 kg

A20VO95:

  • Displacement (Vg max): 93.8 cm³/rev

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

  • Rated Pressure: 350 bar

  • Peak Pressure: 400 bar

  • Maximum Speed @ Vg max: 2,350 min⁻¹

  • Maximum Speed @ Vg ≤ Vg max: 2,780 min⁻¹

  • Maximum Flow (@ nmax & Vg max): 2 × 220 L/min

  • Power (@ qv max & Δp=350 bar): 257 kW

  • Continuous Torque (@ Δp=350 bar): 1,045 N·m

  • Peak Torque (@ Δp=400 bar): 1,194 N·m

  • Moment of Inertia: 0.0346 kg·m² (0.00346 kg·m² per alternate source)

  • Mass (approx.): 217 kg (640 kg per alternate source, configuration-dependent)

A20VO190:

  • Displacement (Vg max): 192.7 cm³/rev

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

  • Rated Pressure: 350 bar

  • Peak Pressure: 400 bar

  • Maximum Speed @ Vg max: 2,500 min⁻¹

  • Maximum Speed @ Vg ≤ Vg max: 2,500 min⁻¹

  • Maximum Flow (@ nmax & Vg max): 2 × 482 L/min

  • Power (@ qv max & Δp=350 bar): 562 kW

  • Continuous Torque (@ Δp=350 bar): 2,147 N·m

  • Peak Torque (@ Δp=400 bar): 2,454 N·m

  • Moment of Inertia: 0.0604 kg·m²

  • Mass (approx.): 281 kg

A20VO260:

  • Displacement (Vg max): 260.0 cm³/rev

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

  • Rated Pressure: 350 bar

  • Peak Pressure: 400 bar

  • Maximum Speed @ Vg max: 2,300 min⁻¹

  • Maximum Speed @ Vg ≤ Vg max: 2,300 min⁻¹

  • Maximum Flow (@ nmax & Vg max): 2 × 598 L/min

  • Power (@ qv max & Δp=350 bar): 698 kW

  • Continuous Torque (@ Δp=350 bar): 2,897 N·m

  • Peak Torque (@ Δp=400 bar): 3,310 N·m

  • Moment of Inertia: 0.0912 kg·m²

  • Mass (approx.): 640 kg

A20VO520 (Complete Model: ALA20VO520LR3DN/10L-VZH26K99 -S2489, Material No. R902564829):

  • Displacement (Vg max): 520.0 cm³/rev

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

  • Rated Pressure: 350 bar

  • Peak Pressure: 400 bar

  • Maximum Speed @ Vg max: 1,450 min⁻¹

  • Maximum Speed @ Vg ≤ Vg max: 1,720 min⁻¹

  • Maximum Flow (@ nmax & Vg max): 2 × 754 L/min (1,508 L/min total)

  • Power (@ qv max & Δp=350 bar): 880 kW

  • Continuous Torque (@ Δp=350 bar): 5,793 N·m

  • Peak Torque (@ Δp=400 bar): 6,621 N·m

  • Moment of Inertia: 0.696 kg·m² (0.0912 kg·m² per alternate source, configuration-dependent)

  • Mass (approx.): 640 kg

  • Control Type: LR (constant power control / load-sensing)

  • Rotation: L (counterclockwise)

  • Design Series: Series 10

Key Technical Advantages

1. Dual Rotary Group with Shared Suction Port — Exceptional Power Density and System Integration
The A20VO series features a unique architecture with two axial piston rotary groups arranged back-to-back sharing a common suction port. Compared to two independent pumps in parallel, the shared suction port design dramatically reduces port count, piping connections, and installation footprint — delivering superior power density and compact dimensions at equivalent flow output. This is particularly evident in the A20VO520, where a single suction port drives both rotary groups to deliver a combined flow of 1,508 L/min.

2. Full-Series Wide Pressure Range — From 250 bar to 400 bar Complete Coverage
The A20VO series offers differentiated pressure ratings across displacements: the A20VO60 delivers 250 bar rated / 315 bar peak; the A20VO95 through A20VO520 deliver 350 bar rated / 400 bar peak. This graduated design enables precise matching from light-duty to heavy-duty applications, eliminating cost waste from “over-engineering.”

3. Comprehensive Control Options — From Pressure to Constant Power
The A20VO series supports multiple control types, including DR pressure control, LR load-sensing/constant power control, HD constant power control, and EP electro-proportional control. The LR constant power control featured in this product automatically adjusts displacement under dynamic load variations to maintain constant drive power. Constant power settings support external adjustment during operation (power control models only), providing exceptional convenience for on-site commissioning and system optimization.

4. Through-Drive — Unlimited System Expansion Flexibility
The A20VO series features standard through-drive capability for tandem mounting of gear pumps or additional axial piston pumps on the same input shaft. This enables the A20VO series to serve as the “power core” of complex hydraulic systems — driving multiple circuits from a single pump without additional power input interfaces or transfer cases.

5. Modular Design — Proven Reliability from Three Platforms
Core components of the A20VO series are derived from the A11VO (RE 92500), A10VO/53 (RE 92703), and A4VSO (RE 92050) — three thoroughly proven variable pump platforms. This modular design strategy ensures that the A20VO series inherits the reliability DNA of all three platforms while offering significant advantages in spare parts commonality and maintenance convenience.

6. Wide Speed Range and Self-Priming Capability
The A20VO series supports a wide speed range from 1,450 to 2,700 min⁻¹ at Vg max, with maximum speeds up to 3,200 min⁻¹ at Vg ≤ Vg max. The pump supports self-priming, pressurized reservoir, or charge pump priming options, adapting to diverse installation conditions and system layouts.

Application Areas

The A20VO series swashplate axial piston variable double pumps are widely deployed in open-circuit hydraulic systems across the following applications:

  • Construction Machinery — hydraulic systems for excavators, loaders, bulldozers

  • Mining Equipment — hydraulic drive systems for underground loaders and haulers

  • Metallurgical Equipment — mill hydraulic systems, coilers

  • Industrial Hydraulic Systems — hydraulic power units for large presses and test benches

  • Material Handling Equipment — hydraulic systems for heavy forklifts and reach stackers

  • Agricultural Machinery — hydraulic systems for large combine harvesters and tractors

  • Specialty Vehicles — hydrostatic transmissions for military vehicles and airport ground support equipment

  • Injection Molding Equipment — hydraulic systems for large injection molding machines

  • Marine and Port Machinery — deck machinery, hatch cover hydraulic systems

Expert Maintenance Tips

1. Installation and Suction Conditions (Critical Step)
The A20VO series supports self-priming, pressurized reservoir, or charge pump priming options. A20VO190 and A20VO260 are recommended with charge pump configuration for optimal suction performance. The A20VO520 — as the largest displacement model — requires adequate supply capacity in the suction line with suction side pressure maintained positive at all times. Before initial start-up or after extended downtime, the housing must always be filled with hydraulic fluid to prevent dry-running damage to critical tribological pairs.

2. Filtration and Fluid Cleanliness
Axial piston pumps are highly sensitive to fluid cleanliness. Recommended filtration per ISO 4406 cleanliness level of 19/17/14 or better. Return line and suction filters should be inspected and replaced regularly. The shared suction port design means a single suction filter serves both rotary groups simultaneously — filter selection and maintenance are particularly critical.

3. Through-Drive Tandem Installation Considerations
For tandem installations on the through-drive, arrange the highest power flow unit closest to the input power source. Ensure all case drain ports in the tandem stack have unrestricted return paths to prevent case pressure exceedance.

4. Constant Power Control Tuning (LR Control Special Attention)
LR constant power control allows power setpoint adjustment via external adjustment mechanisms during pump operation. During commissioning, systematically set power limits per the technical manual to avoid overload conditions. Prior to initial loading, run at low speed with no load for 5–10 minutes to purge air and establish proper oil film before gradually applying load.

5. Independent Monitoring of Dual Rotary Groups
Although the two rotary groups of the A20VO series share a common suction port, each group’s case drain temperature and flow should be monitored independently during operation. Abnormal temperature rise or increased drain flow from one group may indicate early-stage wear in that rotary group — prompt investigation is recommended.

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R902150737A A20VLO190DR/10L‑WXD07N00T‑S
R992001955A A20VLO190DRG/10L‑NXDXXN00‑S
R902087709A A20VLO190DRG/10L‑NXDXXN00‑S
R902150736A A20VLO190EP4D/10L‑WXD07N00T‑S
R902277206A A20VLO190EP4D/10R‑WXD07N00P‑S
R902164192A A20VLO190EP4D/10R‑WXD07N00T‑S
R902150735A A20VLO190EPXD/10L‑XXDXXN00X‑S
R992001958A A20VLO190EPXD/10R‑NXDXXN00XP‑S
R902158360A A20VLO190EPXD/10R‑NXDXXN00XP‑S
R902222137A A20VLO260DRS/10L‑MTD07N00‑S
R986110189A A20VLO260LG2S/10L‑MTD07K07X‑S
R902067354A A20VLO260LG2S/10L‑MTD07K07X‑S
R986110201A A20VLO260LG2S/10R‑NXDXXN00‑S
R902097980A A20VLO260LG2S/10R‑NXDXXN00‑S
R992001603A A20VLO260LG2S/10R‑NXDXXN00‑S
R986110190A A20VLO260LG2S/10R‑NXDXXN00X‑S
R902044326A A20VLO260LG2S/10R‑NXDXXN00X‑S
R902223381A A20VLO260LG2S/10R‑XXD07N00‑S
R902215248A A20VLO260LG2S/10R‑XXD07N00‑S
R992001604A A20VLO260LG2S/10R‑XXD07N00‑S
R902249648A A20VLO260LRDS/10L‑NTD74N00
R902228167A A20VLO260LRDS/10R‑NTD74N00
R902232748A A20VO95DRG/10L‑VSD74N00
R902275614A A20VO95DRG/10R‑VSD74N00
R902249564A A20VO95DRG/10R‑VSD74N00
R902275615A A20VO95DRG/10R‑VSD74N00
R902232539A A20VO95DRS/10R‑VSD74N00
R902232841A A20VO95DRS/10R‑VSD74N00
R902235410A A20VO95DRS/10R‑VSD74N00
R902560882A L A20V O 60 DFR /10R‑VSD24K68
R902424144A L A20V O 60 DFR /10R‑VSD24K68 ‑SO969
R902560701A L A20V O 60 DFR /10R‑VSD24K68 ‑SO969
R992001462A L A20V O 60 DFR /10R‑VSD24K68 ‑SO969
R902530921A L A20V O 60 DFR /10R‑VSD24K68 ‑SO277
R992000691A L A20V O 60 DFR1/10R‑VSD24K01 ‑S1296
R902414972A L A20V O 60 DFR1/10R‑VSD24K01 ‑S1296
R992000854A L A20V O 60 DFR1/10R‑VSD24K01 ‑S2106
R992000872A L A20V O 60 DFR1/10R‑VSD24K01 ‑S2279
R902455987A L A20V O 60 DFR1/10R‑VSD24K01 ‑S2279
R902474639A L A20V O 60 DFR1/10R‑VSD24K01 ‑S2674
R992001463A L A20V O 60 DFR1/10R‑VSD24K01 ‑S2674
R902480087A L A20V O 60 DFR1/10R‑VSD24K01 ‑S2919
R992000953A L A20V O 60 DFR1/10R‑VSD24K01 ‑S2919
R902423470A L A20V O 60 DFR1/10R‑VSD24K52 ‑SO200
R992001464A L A20V O 60 DFR1/10R‑VSD24K52 ‑SO200
R902541403A L A20V O 60 DFR1/10R‑VSD24K52 ‑SO547
R902566639A L A20V O 60 DFR1/10R‑VSD24K68
R902401949A L A20V O 60 DFR1/10R‑VSD24K68
R992001465A L A20V O 60 DFR1/10R‑VSD24K68
R902572378A L A20V O 60 DFR1/10R‑VSD24K68 ‑SO969
R902541405A L A20V O 60 DFR1/10R‑VSD24L20 ‑SO547
R902413930A L A20V O 60 DRG /10R‑VSD24K68 ‑S2086
R986110436A L A20V O 60 DRSC/10R‑VSD24K52 ‑S5140
R902566056A L A20V O 63EK2DSDRS/11R‑VSD24K01P‑S5392
R902554525A L A20V O 63EP2DDRS/11R‑VSD24K01‑S4861
R902553603A L A20V O 72/60 DRS/11R‑VSD24K01 ‑S4891
R902510444A L A20VO 520 LR3DN /10L‑VZH26K00 ‑S2008
R902510446A L A20VO 520 LR3DN /10L‑VZH26K00 ‑S2009
R902514458A L A20VO 520 LR3DN /10L‑VZH26K00 ‑S2106
R902553138A L A20VO 520 LR3DN /10L‑VZH26K00 ‑S2343
R902553139A L A20VO 520 LR3DN /10L‑VZH26K00 ‑S2344
R902538266A L A20VO 520 LR3DN /10L‑VZH26K17 ‑S2106
R902517033A L A20VO 520 LR3DN /10L‑VZH26K99 ‑S2065
R902537491A L A20VO 520 LR3DN /10L‑VZH26K99 ‑S2174
R902564829A L A20VO 520 LR3DN /10L‑VZH26K99 ‑S2489
R902545901A L A20VO 520 LR3DN /10R‑VZH26K68 &‑S2273
R902570650A L A20VO 520 LR3GN /10R‑VZH26K99 ‑S1628
R986120539A L A20VO60DRSC/10R‑VSD24K52 ‑S5140 REMAN
R902520627A L A20VO520LR3DN/10L+LA10VO180ED72/32L
R902541402A L A20VO60DFR1/10R+LA10VNO28ED72/53R
R902413931A L A20VO60DRG/10R+LA10VO45DRG/52R

Tab分隔两列：物料号 型号，直接全选复制粘贴Excel自动分列。需要单列、去重或者合并其他批次告诉我。

Company Profile

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Frequently Asked Questions

1.Hydraulic pump
2.Hydraulic valve
3.Hydraulic motor
4.Hydraulic cylinder
5.Hydraulic parts

MOQ: 1pcs— we support sample and small quantity orders.
  • Adhere to quality first.
  • Support customization, ODM & OEM service.
  • 1-year warranty and complete after-sales support.
  • Safe and fast shipping worldwide.
  • 24-hour online service for your inquiries. 
 
Yes, we are a manufacturer with our own factory.
Common models are in stock, and orders are usually shipped within 1–3 days.
We accept T/T, L/C, PayPal, VISA, Western Union, Apple Pay, Google Pay, Afterpay (Clearpay), Klarna, and Trade Assurance.
 
For full orders: 30% deposit, balance before shipment.
For small/sample orders: full payment in advance.
We offer flexible shipping options: DHL, UPS, FedEx, TNT, EMS, as well as air or sea freight.
 
All deliveries ensure door-to-door fast and safe service.
 
All products are tested before shipment to ensure perfect working condition.
 
We offer a 12-month warranty — if a product fails due to quality issues, we provide free spare parts or repair support.
 
If you encounter any problem during use, please contact your sales manager or our support team at any time.
 
We will respond quickly and help solve the issue efficiently.
  • Hydraulic systems
  • Agricultural machinery
  • Construction machinery
  • Automobile industry
  • Local distributors and maintenance centers 
Yes. We offer competitive wholesale prices and try our best to give benefits to long-term partners.
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