A10VSO Series Variable-Axis Axial Piston Hydraulic Pump: Technical White Paper

 

The Elephant Fluid Power A10VSO series variable axial piston hydraulic pumps (including models A10VSO18, A10VSO28, A10VSO45, A10VSO63, A10VSO71, A10VSO100, A10VSO140, and the extended model A10VSO180) feature a swash plate variable design identical to that of the Bosch Rexroth A10VSO series, offering the core technical advantage of continuously variable displacement (with Vg ranging from maximum to zero). With a rated pressure up to 280 bar (peak pressure of 350 bar), these pumps are specifically designed for open-loop hydraulic systems and widely used in construction machinery, industrial hydraulics, injection molding equipment, metallurgical facilities, and marine deck machinery. This article systematically examines the core competitiveness of the Elephant Fluid Power A10VSO series across six dimensions: technical principles, full specification parameters, eight control modes, application scenarios, compatibility with original Rexroth components, and supply chain advantages, providing authoritative technical guidance and procurement references for global hydraulic system integrators, construction equipment manufacturers, and end-users.

 

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Chapter 1: Technical Principles and Core Design Advantages of the A10VSO Series

1.1 Structural Principle of the Diagonal Disc Variable-Axis Axial Piston

The A10VSO series hydraulic pumps feature a classic swash plate axial piston design—a decades-proven industrial standard in open-loop variable hydraulic transmission systems. Compared to bent-axis designs, the swash plate configuration offers significant advantages in compactness, cost-effectiveness, and control flexibility.

Diaphragm tilt angle variable mechanism

The cylinder centerline coincides with the drive shaft centerline, and the piston contacts the swash plate via a sliding shoe. When the swash plate's swing angle is 0°, the piston exhibits no reciprocating motion and the output flow rate is zero; as the angle increases, the piston's stroke length grows proportionally to the swing angle. The variable mechanism achieves stepless displacement variation from Vg_max to Vg_min = 0 by adjusting the swash plate angle (from 0° to maximum), thereby precisely controlling both output flow rate and pressure.

Static Pressure Unloading Cradle Bearing

The design employs a cradle bearing with hydrostatic pressure unloading, where the swash plate is supported by a hydrostatic oil film, resulting in minimal friction loss and rapid response. This configuration ensures optimal contact between the swash plate and the piston shoe under high-pressure, high-speed operating conditions, achieving a volumetric efficiency of over 95% and a mechanical efficiency exceeding 90%.

Double oil discharge port design

The standard configuration includes two oil discharge ports (L1 and L2), allowing flexible selection of the discharge pipeline routing based on installation space to simplify system design. The discharge pipeline must be separately connected to the oil tank to ensure housing pressure does not exceed 0.5 bar, thereby protecting the shaft seal and sealing system.

1.2 Special Design Features for Open Circuits

The A10VSO series is specifically designed for open-circuit hydraulic systems and features the following key characteristics:

• Flow rate is directly proportional to rotational speed and displacement: output flow rate qv = Vg × n × ηv / 1000 (L/min), where Vg represents current displacement (cm³/rev), n denotes rotational speed (rpm), and ηv indicates volumetric efficiency (typically 0.95–0.97).

• Pressure is determined by external load: the pump's output pressure depends on system demand, with automatic regulation of displacement and pressure via control methods (DR/DFR/DFLR, etc.) to achieve energy-efficient operation.

• Outstanding self-priming performance: The optimized oil intake design and plunger return mechanism ensure excellent self-priming capability under standard installation conditions (oil suction height ≤ 800 mm), eliminating the need for an additional oil replenishment pump.

• Low-noise design: By optimizing the shape of the flow distribution disc windows and the number of plungers (typically 9), it achieves low pulsation and low noise operation, with a typical noise level of 72–78 dB(A).

1.3 Summary of Core Competitive Advantages

 

Technical characteristics	Performance index	Industry Significance
Displacement adjustment range	Vg max → Vg min = 0 (continuously adjustable)	Implement on-demand fuel supply to eliminate overflow losses and achieve 20%-30% energy savings.
Rated/Peak Pressure	280 bar / 350 bar	Meets the demands of high-pressure industrial applications and construction machinery.
maximum speed	From 3900 rpm (A10VSO18) to 1800 rpm (A10VSO140)	covers the entire range of operating conditions, from high-speed, low-flow to low-speed, high-flow scenarios.
volumetric efficiency	≥95%	Reduce energy consumption, minimize heat generation, and extend the service life of lubricating oil.
Mechanical Efficiency	≥90%	High power density, compact design
control method	More than 8 types, including DG/DR/DRG/DFR/DFR1/DFLR/ED/ER	Meet various pressure, flow rate, and power control requirements
Central shaft drive	100% shaft-driven capability (same specifications)	Can be connected in series with a gear pump or an axial piston pump to simplify the system.

 

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Chapter 2: Detailed Explanation of All Technical Specifications for the Elephant Fluid Dynamics A10VSO Series

2.1 Product Models and Displacement Matrix (Series 31/32)

The A10VSO series comprises two structural sub-series: -Series 31 (specifications 18–140): rated pressure 280 bar, peak pressure 350 bar, designed for standard industrial applications; -Series 32 (specifications 45–180): rated pressure 280 bar, peak pressure 350 bar, an optimized high-speed version.

The technical specifications for the standard model of the Elephant Fluid Dynamics A10VSO series (Series 31 standard version) are as follows:

Model	MaximumdisplacementVgmax (cm³/rev)	MinimumdisplacementVgmin (cm³/rev)	RatedPressure (bar)	PeakPressure (bar)	MaximumSpeed@Vgmax (rpm)	Maximumspeed@Vg≈0(rpm)		Maximumoutputflow@n_max (L/min)	MaximumPower@280bar(kW)	Weight (kg)
A10VSO18	18.0	0	280	350	3300	3900	59.4		27.7	12
A10VSO28	28.0	0	280	350	3000	3600	84.0		39.2	15
A10VSO45	45.0	0	280	350	2700	3100	121.5		56.7	21
A10VSO63	63.0	0	280	350	2500	2900	157.5		73.5	28
A10VSO71	71.0	0	280	350	2200	2600	156.2		72.9	33
A10VSO100	100.0	0	280	350	2000	2400	200.0		93.3	45
A10VSO140	140.0	0	280	350	1800	2100	252.0		117.6	60
A10VSO180	180.0	0	280	350	1800	2100	324.0		151.2	78

Note: The above data are theoretical values based on operating conditions of drive speed n = 1500 rpm, oil viscosity v = 36 mm²/s, and oil temperature t = 50 °C. Actual values should account for efficiency losses and manufacturing tolerances.

2.2 Key Performance Calculation Formulas

Pump discharge rate (proportional to displacement and driving speed): qv = Vg × n × ηv / 1000 (L/min)

Where: Vg is the current displacement (cm³/rev), n is the driving speed (rpm), and ηv is the volumetric efficiency (typically 0.95–0.97).

Pump output torque (proportional to displacement and pressure difference): T = Vg × Δp / (20π × η_mh) (Nm)

Where: Δp is the pressure difference (bar), and η_mh is the mechanical-hydraulic efficiency (typically 0.90–0.93).

Pump input power: P = qv × Δp / (600 × η_t) (kW)

Where: η_t represents total efficiency (typically ranging from 0.85 to 0.90).

The core principle of variable control is as follows: when high flow demand occurs (e.g., rapid extension of a hydraulic cylinder), the displacement Vg increases automatically; when pressure maintenance is required (e.g., hydraulic clamping), Vg decreases automatically to near zero. This on-demand oil supply mechanism ensures the system operates consistently in its highest efficiency zone, reducing overall energy consumption by 20–30% compared to a fixed-displacement pump plus relief valve configuration.

 

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Chapter 3: In-depth Analysis of Eight Control Methods

The core competitiveness of the A10VSO series lies in its extensive range of control options. Elephant Fluid Power fully replicates all control features available in the Rexroth A10VSO series.

3.1 DG – Two-point control (direct control)

Working principle: The external switch pressure signal (≥50 bar) directly acts on the control piston to switch the pump displacement between Vg_max and Vg_min, with no intermediate states and only two-position control.

Technical Parameters: – Control Pressure: -Input at port X ≥ 50 bar → Vg min; -No pressure or pressure relief at port X → Vg max -Maximum allowable control pressure: 280 bar – The control pressure depends on the operating pressure (see Control Pressure Curve)

Typical application: Simple systems requiring switching between high and low flow rates, such as hydraulic sheet cutters, bending machines, and basic presses.

3.2 DR – Pressure Control (Direct Control)

Working principle: Equipped with a built-in pressure control valve that limits the pump's maximum output pressure within a preset range. When system pressure reaches the set value, the pump automatically reduces its displacement to deliver only the flow required to maintain the pressure, eliminating overflow losses.

Technical Parameters: – Pressure range: Standard 14 bar (other values available upon request) – Lag and pressure rise: Δp_max ≈ 4 bar – Control deviation decreases as the set pressure value decreases

Typical applications: Systems requiring constant pressure, such as hydraulic clamping devices, hydraulic test benches, and press pressure maintenance systems.

3.3 DRG – Pressure Control (Remote Control)

Working principle: Similar to DR, but pressure setting is remotely adjusted via an external pilot valve. Pressure can be continuously regulated on the operation panel or control cabinet without requiring access to the pump body.

Technical Parameters: -Remote control port: X port connects to external pilot valve-Pilot valve pressure range: 0–280 bar-Response characteristics identical to DR

Common applications: Systems requiring remote pressure regulation, such as multi-station presses, automated production lines, and remotely monitored hydraulic stations.

3.4 DFR/DFR1 – Pressure/Flow Control

Working principle: Integrates pressure control and flow control functions. The DFR is an open-type X-T port model (with flushing function), while the DFR1 is a blocked-type X-T port model (without flushing function). The pump simultaneously maintains the set pressure and set flow rate, achieving "constant pressure and constant flow" control.

Technical Specifications: -Pressure Control: Same as DR model-Flow Control: Achieved via LR pressure regulation with adjustable range-DFR with flushing function: X-T port open, suitable for oil replenishment or cooling in closed circuits-DFR1 without flushing function: X-T port sealed, designed for pure open circuits

Typical applications: Systems requiring simultaneous control of pressure and flow rate, such as injection molding machines, die-casting machines, and hydraulic elevators.

3.5 DFLR – Pressure/Flow/Power Control (Load-Sensitive Control)

Working principle: Integrates three functions—pressure control, flow control, and power control. The pump automatically adjusts to the required pressure, flow rate, and power of the system, preventing motor overload and achieving optimal energy efficiency.

Technical Parameters: – Power control threshold: Automatically calculated based on the motor's rated power – Control behavior: Prioritizes flow demand within the power limit range; when power reaches the limit, automatically reduces pressure or flow rate – Control thresholds: 51–90 bar, 91–160 bar, 160–240 bar,>240 bar (multiple levels available)

Typical applications: power-sensitive equipment such as cranes, excavators, ship deck machinery, and large industrial hydraulic systems.

3.6 ED – Electro-hydraulic Pressure Control (Negative Control)

Working principle: The electro-hydraulic proportional valve receives a current signal (12 V DC or 24 V DC), converts the electrical signal into a pressure signal, and thereby controls the pump displacement. Negative control characteristic: Increased current → increased control pressure → decreased displacement.

Technical Specifications: -ED71:12 V DC, control current 100 mA (start) → 1200 mA (end) -ED72:24 V DC, control current 50 mA (start) → 600 mA (end) -Current limits: 1.54 A (12 V) / 0.77 A (24 V) -Vibration frequency: 100–200 Hz -Operating temperature range: -20°C to +115°C

Typical applications: Automated systems requiring precise electrical signal control of pressure, such as CNC hydraulic presses, servo hydraulic systems, and PLC-controlled hydraulic stations.

3.7 ER – Electro-hydraulic Pressure Control (Positive Control)

Working principle: Similar to ED, but with positive control characteristics: increased current → increased control pressure → increased displacement. Suitable for systems requiring a direct proportional relationship between current and flow rate.

Technical Parameters: – ER71:12 V DC, control current 100 mA (start) → 1200 mA (end) – ER72:24 V DC, control current 50 mA (start) → 600 mA (end) – Other parameters identical to those of ED

Typical applications: Systems requiring proportional control, such as electro-hydraulic proportional speed control systems and servo hydraulic systems.

 

3.8 Control Method Selection Decision Matrix

Control method	Code	Control signal	Control range	Response speed	Complexity	Prime cost	Common Application Scenarios
Two-point control	DG	Hydraulic switch (≥50 bar)	Vg max/Vg min	fast	low	low	Shearing machines, bending machines
pressure control	DR	Built-in mechanical valve	0-280bar	Middle	low	low	Clamping device, test bench
Remote Pressure Control	DRG	External Pilot Valve	0-280bar	Middle	Middle	Middle	Multi-station presses, production lines
Pressure/Flow Control	DFR	Hydraulic + Mechanical (X-T Open)	Pressure + Flow Rate	Middle	Middle	Middle	Injection molding machines, die casting machines
Pressure/Flow Control	DFR1	Hydraulic + Mechanical (X-T blockage)	Pressure + Flow Rate	Middle	Middle	Middle	Pure open-loop system
Pressure/Flow/Power Control	DFLR	Hydraulic + Mechanical	Pressure + Flow Rate + Power	Middle	Gao	Gao	Crane, excavator
Electro-hydraulic pressure control (negative)	ED71	12V DC	0-280bar	fast	Gao	Gao	Numerical control hydraulic press, servo system
Electro-hydraulic pressure control (negative)	ED72	24V DC	0-280bar	fast	Gao	Gao	Numerical control hydraulic press, servo system
Electro-hydraulic pressure control (positive)	ER71	12V DC	0-280bar	fast	Gao	Gao	Hydroelectric proportional speed control system
Electro-hydraulic pressure control (positive)	ER72	24V DC	0-280bar	fast	Gao	Gao	Hydroelectric proportional speed control system

 

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Chapter 4: In-depth Comparison of Compatibility with the Bosch Rexroth A10VSO Series

4.1 Dimensions and Installation: 100% Interchangeability

The Elephant Fluid Dynamics A10VSO series strictly adheres to Rexroth's original design specifications (Data Sheets RE 92711/RE 92714), ensuring complete physical interchangeability.

• Installation flange: Compliant with ISO 3019-2 standards, available in 2-hole and 4-hole configurations, with installation dimensional tolerance controlled within ±0.1 mm.

• Drive shaft end: Available in three options – DIN 6885 flat key shaft, DIN 5480 splined shaft, and ANSI B92.1a splined shaft – fully compatible with Rexroth's corresponding models.

• Oil port connection: SAE flanged oil port compliant with ISO 6162 standard, available in both metric and UNC thread options

• Control Interface: The DG/DR/DRG/DFR/DFLR/ED/ER control ports precisely correspond to those of the original Rexroth components.

• Oil discharge ports: Standard configuration includes two oil discharge ports (L1 and L2), positioned identically to those of the original Rexroth components.

• Axial drive: 100% axial drive capability (same specifications), compatible with series connection of gear pumps or axial piston pumps; flange and hub dimensions match those of original Rexroth components.

4.2 Performance Parameters: Third-party Benchmark Testing

Through comparative testing conducted by the internationally renowned hydraulic testing institution (TUV Rheinland certification laboratory), the performance comparison between the Elephant Fluid Power A10VSO series and Rexroth's original products is as follows:

Performance index	Elephant Fluid Dynamics A10VSO71	Rexroth A10VSO71	Contrast difference	Testing standard
volumetric efficiency	95.8%	96.2%	<0.5%	ISO 4409
Mechanical Efficiency	91.5%	91.8%	<0.4%	ISO 4409
gross efficiency	87.6%	88.1%	<0.6%	ISO 4409
Noise Level (dB(A))	74-76	73-75	match	ISO 4412-1
Pressure control accuracy	±3 bar	±2 bar	match	built in test
Variable Response Time	0.25s	0.22s	+0.03s	built in test
Continuous operating life	>15,000h	>15,000h	match	accelerated life test
price level	baseline	2.5 to 3.5 times that of an elephant	Significant advantage	market research

Note: Test conditions include a mineral oil medium, ISO VG46 standard, oil temperature of 40°C, rated pressure of 280 bar, and operating speed of 1500 rpm.

4.3 Complete Reproduction of Control Methods

The Elephant Fluid Dynamics A10VSO series fully supports all control methods of the Rexroth A10VSO series.

• DG: Dual-point control, direct operation

• DR: Pressure control, direct operation

• DRG: Pressure control, remote control

• DFR/DFR1: Pressure/flow control; X-T opening/blocking

• DFLR: Pressure/Flow/Power Control

• ED71/ED72: Electro-hydraulic pressure control (negative control), 12 V/24 V DC

• ER71/ER72: Electro-hydraulic pressure control (positive control), 12 V/24 V DC

The response characteristics, control curves, and electromagnet parameters of all control modes are identical to those of Rexroth's original components, enabling direct replacement without requiring reconfiguration of the control system.

4.4 Quality Certification System

• ISO 9001:2015 Quality Management System Certification

• CE certification complies with the EU Machinery Directive 2006/42/EC.

• RoHS certification: Compliance with the Directive on Restrictions of Hazardous Substances

• ATEX certification optional (II 2G Ex h IIC T4-T1 Gb X / II 3G Ex h IIC T4-T1 Gc X)

• China Classification Society (CCS) certification applies to ships and marine engineering applications

• TUV Rheinland Performance Testing Certification (optional)

 

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Chapter 5: Industry Application Scenarios and Solutions

5.1 Hydraulic Systems for Engineering Machinery

Excavator Hydraulic System (A10VSO71/A10VSO100)

20–40-ton excavators typically employ a dual-pump system (one left and one right pump, model A10VSO71 or A10VSO100). The DFLR pressure-flow-power control system enables the following functions: – Compound operation: Independent control of both pumps to execute coordinated movements of the boom, dipper arm, and rotation; – Power limitation: Automatic reduction of total pump output when engine power is insufficient, preventing engine stall; – Energy-efficient operation: Automatic reduction of displacement to near zero during standby mode, minimizing energy consumption and heat generation.

Hydraulic System for Concrete Pump Trucks (A10VSO71/A10VSO100)

The main pump of concrete pumping trucks typically uses A10VSO71 or A10VSO100 materials. Through DRG remote pressure control, the system achieves: -Pumping pressure adjustment: Remote regulation of pumping pressure based on concrete grade and delivery distance; -Direction switching control: Integrated with the S-valve directional switching system for precise timing control of pumping and direction reversal; -Energy-saving standby mode: Automatic reduction of displacement during intermittent pumping periods to minimize energy consumption.

Roller Hydraulic System (A10VSO45/A10VSO63)

Vibration rollers typically employ A10VSO45 or A10VSO63 motors for their travel and vibration systems. Through DG two-point control or DR pressure control, the following functions are achieved: – Travel drive: DG control enables switching between "forward/retreat" speed modes; – Vibration system: DR control maintains constant vibration frequency to ensure compaction quality.

5.2 Industrial Hydraulic Systems

Hydraulic System for Injection Molding Machines (A10VSO45/A10VSO71/A10VSO100)

Injection molding machines typically employ the A10VSO series as the main pump, controlled by DFR/DFLR modes: -Injection phase: high-flow rapid injection (Vg max) -Pressure holding phase: high-pressure low-flow pressure maintenance (Vg reduced, pressure sustained) -Plasticizing phase: medium-flow plasticization (Vg moderate) -Energy-saving standby mode: automatically reduces flow rate to near zero during intermittent periods

Compared to the conventional pump-plus-overflow-valve configuration, the A10VSO variable pump reduces energy consumption by 25%–35%, lowers oil temperature rise, and extends seal durability.

Die-casting machine hydraulic system (A10VSO71/A10VSO100)

Die-casting machines require rapid mold closing, high-pressure mold locking, and quick mold opening. The A10VSO series achieves these through DFLR control: – Rapid mold closing: high-flow rapid closure (Vg max, shortening cycle time) – High-pressure mold locking: low-flow high-pressure locking (reduced Vg with sustained pressure to ensure casting quality) – Rapid mold opening: high-flow rapid opening (Vg max) – Power protection: prevents motor overload caused by excessive locking force

Hydraulic System for Hydraulic Press (A10VSO100/A10VSO140)

Hydraulic presses (four-column hydraulic presses, frame hydraulic presses) typically employ A10VS0100 or A10VS0140 models. They are controlled via ED/ER electro-hydraulic systems to achieve: – Numerical control precision: Integrated with PLCs or CNC systems for digital precision control of pressure, speed, and position; – Multi-station synchronization: Multiple pumps operate in parallel for simultaneous or sequential control across multiple stations; – Energy-efficient operation: Automatic reduction of displacement during idle periods to minimize energy consumption.

5.3 Metallurgical and Mining Equipment

Hydraulic System for Metallurgical Rolling Mills (A10VSO100/A10VSO140)

Hydraulic systems for press rolling, bending rolls, and side guide plates in hot and cold rolling production lines. The A10VSO series achieves the following through ED electro-hydraulic control: – Rapid response: millisecond-level pressure response ensuring rolling accuracy; – Precise control: ±1 bar pressure accuracy guaranteeing uniform strip thickness; – High reliability: strong resistance to contamination (operates reliably with NAS 9-grade oil) and suitability for dust-prone metallurgical environments.

Mining Machinery Hydraulic System (A10VSO71/A10VSO100)

Hydraulic systems for mining trucks, loaders, and rock-cutting platforms. The A10VSO series features DFLR-based control that delivers: – High power output: Single pumps exceed 100 kW, meeting demands of heavy-duty mining equipment; – Power protection: Prevents engine or motor overload under harsh mining conditions; – High reliability: Long-life design with extended maintenance intervals, minimizing operational downtime losses.

5.4 Ships and Marine Engineering

Hydraulic System for Ship Deck Machinery (A10VSO45/A10VSO71)

Anchoring machinery, winch, and hatch cover opening/closing mechanism. Certified by China Classification Society (CCS), meeting corrosion resistance and impact resistance requirements for marine environments. DRG remote pressure control allows operators to adjust system pressure directly from the bridge.

Marine Platform Hydraulic System (A10VSO100/A10VSO140)

Hydraulic systems for drilling platforms and production platforms. The A10VSO series integrates with platform automation systems via ED electro-hydraulic control, enabling remote monitoring and fault diagnosis.

 

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Chapter 6: Elephant Fluid Dynamics' Supply Chain Advantages and Service Commitments

6.1 Rapid Delivery Capability

Leveraging China's comprehensive hydraulic industry chain and intelligent manufacturing bases, Elephant Fluid Power has established an industry-leading delivery system:

• Standard Models (A10VSO18–A10VSO71): Regular models are in stock and will be shipped within 48–72 hours after order confirmation.

• Medium to large models (A10VSO100–A10VSO140): Delivery time: 7–15 working days

• Large models (A10VSO180) and special control configurations: Delivery time is 15–25 working days.

• Emergency Response: Direct air freight service available, delivering to major industrial zones worldwide within 72–96 hours.

• Batch OEM Orders: Supports monthly/quarterly rolling inventory planning to ensure customer production continuity

6.2 Cost-Benefit Analysis

Compared to Bosch Rexroth's original products, the Elephant Fluid Power A10VSO series delivers significant economic benefits for customers:

• Reduced procurement costs: Direct procurement costs saved by 60%–70%.

• System Compatibility: The DG/DR/DFR/DFLR/ED/ER control modes are fully compatible with Rexroth systems, eliminating the need for system replacement and reducing procurement costs for control valve assemblies by over 50%.

• Optimized accessory costs: All components (cylinder block, plunger, flow distributor, swash plate, control valve core, seals) are available in ample supply at prices only 30%-40% of original factory prices.

• Inventory cost optimization: Supports small-batch, frequent purchases to reduce capital tie-up

• Minimizing downtime losses: Rapid delivery capability reduces equipment downtime from weeks to days, with daily losses for production-intensive equipment potentially reaching tens of thousands of yuan.

6.3 Global Technical Support

Elephant Hydrodynamics has established a comprehensive technical service network covering major industrial regions worldwide.

• Technical Consultation: Provides 24/7 online selection guidance, system compatibility analysis, and fault diagnosis support. The technical team members have an average of over 15 years of experience and are proficient in all Rexroth product lines.

• Custom Development: Provides solutions tailored to the specific needs of OEM customers.

– Fine adjustment of displacement (e.g., Vg_max = 75 cm³ instead of the standard 71 cm³)

– Special seals (FKM, HNBR, low-temperature seals)

– Special control methods (e.g., custom pressure range, custom control curve)

– Special coatings (marine corrosion-resistant coatings, customer brand logos)

• Warranty Commitment: Standard warranty period is 12 months or 2,000 working hours (whichever comes first), extendable to 36 months upon request. Faulty parts are replaced free of charge during the warranty period; lifetime technical support is provided after the warranty expires.

 

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Chapter 7: Selection Guidelines and Detailed Explanation of Ordering Codes

7.1 Model Coding Rules

The Elephant Fluid Dynamics A10VSO series models adhere to internationally standardized coding conventions; example: A10VSO 71 DFR / 31R-VPA12N00.

Code segment	Meaning	Option Description
A10VSO	Series Identification	Diaphragm-type variable displacement axial piston pump, open circuit
71	Specifications/Maximum Displacement	71 cm³/rev
DFR	control method	DG = Two-point control; DR = Pressure control; DRG = Remote pressure control; DFR = Pressure/flow control (when X-T is open); DFR1 = Pressure/flow control (when X-T is blocked); DFLR = Pressure/flow/power control; ED = Electro-hydraulic pressure control (negative); ER = Electro-hydraulic pressure control (positive).
31	serial number	31 = Series 31 (Standard); 32 = Series 32 (High-Speed Optimized Version)
R	rotation direction	R = clockwise (viewed from the shaft end); L = counterclockwise
V	sealing material	V = F × K_M (fluororubber, standard); P = NBR (nitrile rubber, used exclusively in HFA/HFB/HFC media)
P	Axle Type	P = flat key shaft (DIN 6885); S = splined shaft (DIN 5480); R = splined shaft (ANSI B92.1a, high torque).
A	Installation Flange	A = ISO 3019-2 (2 holes); B = ISO 3019-2 (4 holes)
12	actuator port	12 = SAE flange oil port, metric thread, laterally opposed; 42 = SAE flange oil port, UNC thread, laterally opposed
N00	Central shaft drive	N00 = No through-shaft drive; other codes correspond to through-shaft drive flanges and hubs of different specifications

7.2 Selection Decision Process

Step 1: Determine System Requirements

-Calculate the system's maximum flow demand: Q_max = Σ (maximum flow rates of all actuators) × simultaneity factor -Calculate the system's maximum operating pressure: p_max = maximum load pressure + pipeline losses + safety margin (typically 10%–15%) -Verify drive motor parameters: rated power, rated speed, and maximum torque

Step 2: Select pump specifications

Based on the system's maximum flow rate Q_max (L/min) and driving speed n (rpm): Vg_max = (Q_max × 1000 / n) × (1.05–1.10) cm³/rev. The coefficient range of 1.05–1.10 accounts for volume losses and manufacturing tolerances.

Select the model closest to and greater than the calculated value from the standard specifications.

Step 3: Verify Power Matching

Calculated maximum input power of the pump: P_max = Q_max × p_max / (600 × η_t) (kW)

Verification: P_max ≤ Motor rated power × 1.1 (safety factor). If P_max exceeds the motor's rated power, select a larger motor or a pump with smaller displacement.

Step 4: Select Control Method

-Simple System (requires only pressure limitation) → DR Pressure Control -Requires remote pressure adjustment → DRG Remote Pressure Control -Requires simultaneous control of pressure and flow rate → DFR/DFR1 Pressure/Flow Control -Power-sensitive equipment (to prevent motor overload) → DFLR Pressure/Flow/Power Control -Automated system (requires electrical signal control) → ED/ER Electro-hydraulic Pressure Control

Step 5: Confirm installation conditions

Installation Direction: Horizontal installation of the drive shaft is recommended; for vertical installation (axially up/down), thorough oil filling and air removal are mandatory. Oil Absorption Requirements: Oil suction height ≤ 800 mm, suction pipe diameter ≥ pump inlet diameter, suction filter accuracy ≤ 100 μm. Oil Drain Circuit: Connect separately to the oil tank, ensuring housing pressure ≤ 0.5 bar. Oil Viscosity: Select ISO VG22–VG68 based on ambient temperature; optimal operating viscosity range: 16–36 mm²/s.

 

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Chapter 8: Maintenance, Fault Diagnosis, and Life Management

8.1 Key Points of Daily Maintenance

Oil Management (Most Critical)

Cleanliness grade: Recommended ISO 4406 grades 18/16/13 (equivalent to NAS 7); minimum acceptable grades are 20/18/15 (NAS 9). Oil contamination is the primary cause of failure in the A10VSO series. Viscosity management: Optimal operating viscosity range is 16–36 mm²/s. Selection based on ambient temperature: – Low-temperature environment (-20°C to +10°C): ISO VG22 or VG32 – Ambient temperature (+10°C to +40°C): ISO VG46 – High-temperature environment (+40°C to +80°C): ISO VG68. Replacement interval: Mineral oil – every 2,000 operating hours or annually; eco-friendly oils – every 1,000 operating hours or every six months. Sampling and testing: Viscosity, acid value, moisture content, and contamination level shall be measured every 500 hours or quarterly.

Temperature Monitoring

-Normal operating case temperature: 40°C–70°C -Maximum allowable temperature: 80°C (short-term peak of 90°C, duration <10 minutes) -If the temperature exceeds 80°C, inspect: cooling system, overflow valve settings, internal leaks, and whether oil viscosity is too low

Oil absorption condition monitoring

-Absolute pressure at oil suction port: ≥0.8 bar (to prevent cavitation) -Oil suction height: ≤800 mm (under standard installation conditions) -Pressure drop across oil suction filter: ≤0.3 bar (exceeding this value requires filter replacement)

8.2 Common Fault Diagnosis and Troubleshooting

Fault phenomenon	Possible Reasons	Diagnostic method	Exclusion Measures
Insufficient output flow	Excessively low oil viscosity leads to increased internal leakage (due to wear of the distributor plate/plunger), insufficient drive speed, and jamming of the variable mechanism at Vg min.	Measure oil viscosity, determine the return oil flow rate in the housing (normal <5% of Q_in), check drive speed, and verify variable piston displacement.	Replace with appropriate viscosity oil, replace the distributor plate/plunger, inspect the drive motor, and clean the variable valve mechanism.
Insufficient output pressure	The pressure is set too low, there is internal leakage, the variable mechanism has not reached Vg max, or the relief valve is faulty.	Set the system pressure, measure the oil return flow rate in the housing, check the position of the variable piston, and verify the relief valve.	Increase pressure setting, replace seals, adjust the variable mechanism, and repair/replace the relief valve.
Variable response is slow	Control oil contamination (valve core sticking), insufficient oil pressure, and wear of variable piston seals	Monitor and control oil cleanliness, oil pressure, and piston leakage of variable components.	Replace the control oil filter element, clean the control valve, and replace the sealing of the variable piston.
Abnormal noise	Oil line leakage (cavitation), oil containing gas, bearing damage, wear of flow distribution plate	Check the sealing integrity of the oil suction pipeline, measure the gas content in the oil, and perform vibration spectrum analysis.	Tighten the oil suction lines and exhaust system; replace the bearings and the distributor plate.
Shell oil leakage	Axle seal wear (most common), excessive housing pressure (due to oil drain pipe blockage), seal aging	Check the back pressure of the oil discharge pipe (should be <0.5 bar) and inspect the condition of the shaft seal.	Replace the shaft seal, clear the oil discharge pipe, and replace the sealing components.
superheat	Persistent overload (excessive pressure differential), oil contamination, inadequate cooling, severe internal leakage	Test parameters: pressure differential, oil contamination level, cooler efficiency, and shell return oil flow rate	Reduce load, switch to a larger model, replace the oil, improve cooling, or replace worn components.
Variable control system malfunction	Control valve core jamming, electromagnet failure (ED/ER), pilot oil line blockage (DRG)	Measure the resistance of the electromagnet, monitor the oil pressure, and disassemble to inspect the valve core.	Clean or replace the control valve; replace the electromagnet; clear the pilot oil line.
cavitation	Excessively low oil suction pressure, excessively high oil suction head, blockage in the oil suction pipeline, or excessively high oil viscosity	Measure the absolute pressure at the oil suction port, determine the oil suction height, inspect the oil suction filter, and measure the oil viscosity.	Reduce the oil suction height, replace the oil suction filter element, use oil with appropriate viscosity, and increase the diameter of the oil suction pipe.

8.3 Predictive Maintenance and Life Management

Key service life parameters: -Distribution plate-cylinder friction pair: Normal service life 12,000–15,000 hours; service life reduced by over 50% when oil contamination exceeds limits-Plunger-sliding shoe friction pair: Normal service life 15,000–20,000 hours; closely related to oil cleanliness and viscosity-Diaphragm bearing system: Normal service life 12,000–15,000 hours; service life extended by static pressure relief design-Shaft seal: Normal service life 8,000–12,000 hours; closely related to housing temperature and shaft surface roughness-Control valve core: Normal service life 10,000–15,000 hours; closely related to control oil cleanliness

predictive maintenance recommendations: -Install an online oil contamination sensor (ISO 4406 standard) for real-time monitoring; -Measure the return oil flow rate of the housing every 2,000 hours and analyze trends in internal leakage; -Perform vibration spectrum analysis every 5,000 hours to detect early bearing wear; -Check control oil cleanliness quarterly to prevent valve core sticking; -Maintain a equipment maintenance log recording all replaced parts and oil test data.

 

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Chapter 9: The Industry Value and Strategic Significance of the Elephant Fluid Dynamics A10VSO Series

9.1 Redefining the Cost-Performance Criteria for Hydraulic Pumps

Traditionally, high-performance variable-displacement hydraulic pumps have been associated with exorbitant costs. However, Elephant Hydraulics has successfully overturned this perception through the following strategic initiatives:

• Vertical integrated manufacturing chain: From casting, machining, heat treatment to assembly and testing, the entire process is fully controlled internally, reducing outsourcing costs by over 30%.

• Lean production management: By implementing the Toyota Production System (TPS), the production cycle was shortened by 40% and work-in-progress inventory was reduced by 50%.

• Advantages of large-scale procurement: With an annual purchase volume exceeding 100,000 units, key raw materials (bearing steel, copper alloys, seals) are procured centrally, resulting in a cost reduction of 20%-30%.

• Smart Manufacturing Upgrade: Investment in CNC machining centers, assembly lines staffed by employees with 10 years of experience, and automated testing systems, resulting in a threefold increase in per capita output.

Key outcome: The A10VSO series delivers performance equivalent to 95% of that of original Rexroth products at only 25%-35% of their price, creating unprecedented value for customers worldwide.

9.2 Supporting the diversification and resilience of global supply chains

In recent years, the global manufacturing industry has placed unprecedented emphasis on supply chain resilience. The Elephant Fluid Power A10VSO series, as high-quality hydraulic power components manufactured in China, provides customers in Europe, North America, Southeast Asia, the Middle East, Africa, and South America with a reliable "Second Source" option:

• European Market: Provides OEM components for industrial hydraulic equipment manufacturers in Germany, Italy, France, the Netherlands and other countries, with delivery times of 7–15 days (compared to Rexroth's original 4–8 weeks).

• North American Market: Through our Houston service center in the United States, we provide rapid parts supply services to hydraulic repairers in Texas, California, and Illinois.

• Southeast Asian market: Service centers in Singapore, Thailand, and Indonesia support the JIT production model adopted by local injection molding machine and construction equipment manufacturers.

• Middle East/Africa Market: Service centers in Dubai and Johannesburg support emergency maintenance needs for mining machinery and oil equipment.

• South American Market: The service center in São Paulo, Brazil supports the localized procurement of agricultural and forestry machinery.

9.3 Continuous Technological Innovation and Product Roadmap

Elephant Fluid Power continues to invest in the upgrade and development of the A10VSO series. The technology roadmap for the next three years includes:

Materials Innovation: - Ceramic-coated plungers: 3x increase in hardness, 5x increase in wear resistance, target life of 25,000 hours. - Carbon fiber reinforced swashplates: 40% weight reduction, 60% reduction in thermal deformation, improved stability under high-temperature conditions. - Nanocomposite seals: 50% reduction in friction coefficient, 2x extension of seal life.

Intelligent Integration: - Built-in pressure/temperature/flow sensors: Real-time monitoring of pump health status, data output via CAN bus. - IoT data interface: Supports 4G/5G remote data transmission for predictive maintenance. - Digital twin system: Builds a digital model of the pump based on operational data, providing 30-day advance warning of potential faults.

Energy Efficiency Optimization: - CFD fluid simulation optimizes the distribution window design: Reduces distribution impact losses, target total efficiency exceeding 90%. - Magnetorheological variable control: Response time reduced from 0.25 seconds to 0.05 seconds, achieving millisecond-level dynamic response. Energy Recovery System: Recovers kinetic energy during braking, reducing overall system energy consumption by 10%-15%. Environmentally Compatible: - Fully compatible with biodegradable hydraulic media: HETG (rapeseed oil-based), HEES (synthetic ester-based), HFD (water-glycol-based) - Oil-free bearing technology: Exploring the application of air-bearing and magnetic levitation bearings in hydraulic pumps to completely eliminate oil contamination. - Lightweight design: Through topology optimization and the application of aluminum alloy materials, pump weight is reduced by 20%-30%, helping customers achieve carbon neutrality goals.

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Chapter 10: Conclusion and Procurement Recommendations

10.1 Key Conclusions

The Elephant Fluid Dynamics A10VSO series variable displacement axial piston hydraulic pumps (A10VSO18–A10VSO180) feature the following advantages:

1. Comprehensive specification range: from 18 cm³ to 180 cm³, meeting all requirements for applications ranging from micro-industrial equipment to large-scale construction machinery.

2. High compatibility with original Bosch Rexroth products: 100% physical interchangeability, over 95% performance equivalence, and full replication of all control methods.

3. Proven reliable performance: over 15,000 hours of continuous operating life, 95% volumetric efficiency, and total efficiency exceeding 87%.

4. Highly competitive supply chain advantages: 60%-70% cost savings, rapid delivery within 48 hours to 25 days, and a service network covering six continents worldwide.

5. Continuous technological innovation capability: simultaneous advancement in four key areas—materials, intelligence, energy efficiency, and environmental protection.

It has become the preferred alternative in the global hydraulic power transmission sector. Whether for original equipment manufacturing (OEM) applications or after-market maintenance and replacement needs, whether for cost-sensitive budget-friendly systems or high-end equipment demanding ultimate reliability, the Elephant Fluid Power A10VSO series delivers a tailored value proposition.

10.2 Recommendations for Procurement Decisions

For engineering machinery manufacturers (OEMs): – Start with small-scale trial installations (5–10 units) to verify compatibility with existing systems; – Utilize Elephant Hydraulics' free technical consulting services to optimize system integration (pump–motor–valve–pipelines); – Sign annual framework agreements to lock in prices and delivery schedules, ensuring production continuity; – Consider incorporating Elephant Hydraulics into a "dual supply source" strategy to mitigate supply chain risks.

For hydraulic system integrators: -Offer the Elephant Hydraulics A10VSO series as a standard configuration option to end customers; -Leverage rapid delivery capabilities (shipments within 48 hours) to handle emergency orders and maintenance projects; -Participate in Elephant Hydraulics' technical training programs (online/offline) to enhance team expertise; -Maintain comprehensive component inventories (cylinder blocks, plungers, flow plates, swash plates, control valve cores, seals) to improve maintenance response efficiency.

For end-users (industrial, mining, construction, etc.): – During major equipment overhauls, consider replacing Rexroth original pumps with Elephant Fluid Power's A10VSO series to reduce maintenance costs by over 60%; – Retain the existing control system (DG/DR/DFR/DFLR/ED/ER valve assemblies) without additional investment; – Access local technical support through Elephant Fluid Power's global service center; – Establish equipment maintenance records and implement predictive maintenance to maximize pump service life.

 

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Appendix

Appendix A: Complete Model Reference Table for the A10VSO Series

Model	MaximumDisplacement (cm³)	RatedPressure (bar)	PeakPressure (bar)	MaximumSpeed@Vgmax(rpm)	Maximumrotationalspeed@Vg≈0(rpm)	MaximumFlowRate (L/min)	MaximumPower@280bar(kW)	Weight (kg)	FlangeSpecifications	AxleEndOptions	Controlmethod
A10VSO18	18.0	280	350	3300	3900	59.4	27.7	12	ISO 2-hole/4-hole	Flat Key/Spiral Key	DG/DR/DRG/DFR/DFR1/DFLR/ED/ER
A10VSO28	28.0	280	350	3000	3600	84.0	39.2	15	ISO 2-hole/4-hole	Flat Key/Spiral Key	DG/DR/DRG/DFR/DFR1/DFLR/ED/ER
A10VSO45	45.0	280	350	2700	3100	121.5	56.7	21	ISO 2-hole/4-hole	Flat Key/Spiral Key	DG/DR/DRG/DFR/DFR1/DFLR/ED/ER
A10VSO63	63.0	280	350	2500	2900	157.5	73.5	28	ISO 2-hole/4-hole	Flat Key/Spiral Key	DG/DR/DRG/DFR/DFR1/DFLR/ED/ER
A10VSO71	71.0	280	350	2200	2600	156.2	72.9	33	ISO 2-hole/4-hole	Flat Key/Spiral Key	DG/DR/DRG/DFR/DFR1/DFLR/ED/ER
A10VSO100	100.0	280	350	2000	2400	200.0	93.3	45	ISO 2-hole/4-hole	Flat Key/Spiral Key	DG/DR/DRG/DFR/DFR1/DFLR/ED/ER
A10VSO140	140.0	280	350	1800	2100	252.0	117.6	60	ISO 2-hole/4-hole	Flat Key/Spiral Key	DG/DR/DRG/DFR/DFR1/DFLR/ED/ER
A10VSO180	180.0	280	350	1800	2100	324.0	151.2	78	ISO 4 holes	Flat Key/Spiral Key	DG/DR/DRG/DFR/DFR1/DFLR/ED/ER

Appendix B: Quick Reference Table for Selecting Control Methods

Control method	Code	Control signal	Control range	Response speed	Applicable Model	Typical Application
Two-point control	DG	Hydraulic switch (≥50 bar)	Vg max/Vg min	fast	18-180	Shearing machines, bending machines
pressure control	DR	Built-in mechanical valve	0-280bar	Middle	18-180	Clamping device, test bench
Remote Pressure Control	DRG	External Pilot Valve	0-280bar	Middle	18-180	Multi-station presses, production lines
Pressure/Flow Control	DFR	Hydraulic + Mechanical (X-T Open)	Pressure + Flow Rate	Middle	18-180	Injection molding machines, die casting machines
Pressure/Flow Control	DFR1	Hydraulic + Mechanical (X-T blockage)	Pressure + Flow Rate	Middle	18-180	Pure open-loop system
Pressure/Flow/Power Control	DFLR	Hydraulic + Mechanical	Pressure + Flow Rate + Power	Middle	45-180	Crane, excavator
Electro-hydraulic pressure control (negative)	ED71	12V DC	0-280bar	fast	18-180	Numerical control hydraulic press, servo system
Electro-hydraulic pressure control (negative)	ED72	24V DC	0-280bar	fast	18-180	Numerical control hydraulic press, servo system
Electro-hydraulic pressure control (positive)	ER71	12V DC	0-280bar	fast	18-180	Hydroelectric proportional speed control system
Electro-hydraulic pressure control (positive)	ER72	24V DC	0-280bar	fast	18-180	Hydroelectric proportional speed control system

Appendix: References and Standards

6. Bosch Rexroth AG. “Axial Piston Variable Pump A10VSO Series 31, Data Sheet RE 92711.” 2016.

7. Bosch Rexroth AG. “Axial Piston Variable Pump A10VSO Series 32, Data Sheet RE 92714.” 2016.

8. ISO 3019-2:2001. “Hydraulic fluid power - Dimensions and identification code for mounting flanges and shaft ends of displacement pumps and motors.”

9. ISO 4409:2019. “Hydraulic fluid power - Positive-displacement pumps, motors and integral transmissions - Methods of testing and presenting basic steady state performance.”

10. ISO 4406:2021. “Hydraulic fluid power - Fluids - Method for coding the level of contamination by solid particles.”

11. ISO 6162:2002. “Hydraulic fluid power - Flange connections with split or one-piece flange clamps and metric or inch screws.”

12. DIN 51524. “Pressure fluids - Hydraulic oils HL, HLP, HLPD.”

13. DIN 6885. “Drive type fastenings without taper action; Parallel keys, keyways, deep pattern.”

14. ANSI B92.1a. “Involute Splines and Inspection.”

15. Elephant Fluid Dynamics. "Product Manual for A10VSO Series Variable Axial Piston Pump," 2026 edition.

16. China Hydraulic and Pneumatic Seals Industry Association. "Technical Development Report of the Variable Hydraulic Pump Industry." 2025.

17. TUV Rheinland. “Performance Test Report for Elephant Fluid Power A10VSO Series.” 2025.

 

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Copyright © 2026 Elephant Fluid Dynamics

This document is for technical communication and selection reference only. Specific parameters should refer to the latest product manual.

 

 

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This document was compiled by Elephant Hydraulics to provide the global hydraulic industry with authoritative, professional, and comprehensive technical references. We are committed to becoming your most trusted hydraulics partner through technological innovation and exceptional service.

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