A11VO40 / A11VO60 / A11VO75 / A11VO95 / A11VO130 / A11VO145 / A11VO190 / A11VO260

The A11VO is a high-pressure variable-displacement piston pump designed specifically for Bosch Rexroth’s open-loop systems in mobile machinery. It features a swashplate-type variable-displacement design with a rated continuous pressure of 350 bar and a short-term peak pressure of 400 bar. The suffix number indicates the nominal displacement, which is divided into two main categories: small-to-medium displacement (40–145) and large displacement (190, 260).

Detailed descriptions of each model

A11VO40

1. Basic Parameters: 42 cc/r, maximum 3000 r/min; offers the highest maximum speed and smallest size across the entire series;

2. Structural Features: Compact housing, small suction port size, excellent self-priming performance, no forced replenishment required; the through-shaft design allows for series connection with small gear pumps to serve as steering or pilot oil sources;

3. Common Controls: DRS, LR, EP (electro-proportional);

4. Typical Applications: Micro loaders, auxiliary pumps for truck-mounted cranes, small drilling rigs, hydraulic main pumps for sanitation vehicles, and pilot pumps for construction machinery.

5. Advantages and Disadvantages: Compact size, requiring minimal installation space; low output flow rate, suitable only for light-duty equipment; unable to drive heavy-duty actuators.

A11VO60

1. Basic Parameters: 58.5 cc/r, maximum 2700 r/min, Entry-level workhorse for small-to-medium flow rates;

2. Structural Features: Moderately sized housing, stable self-priming, simple piping layout; high expandability with through-shaft design;

3. Common Control: LRDS (Load-Sensitive + Constant Power), standard on small construction equipment;

4. Typical Applications: Small wheel loaders, 6-cubic-meter concrete mixer trucks, light-duty asphalt pavers, small rock drilling rigs.

5. Advantages and Disadvantages: High cost-effectiveness and low fuel consumption; insufficient flow rate for heavy-load operations; not suitable for large concrete equipment.

A11VO75

1. Basic Parameters: 74 cc/r, maximum 2550 r/min, flow rate between 60 and 95;

2. Design Features: Upgraded housing strength; enlarged internal plunger friction pairs for improved load-bearing capacity; self-priming with no risk of cavitation;

3. Common Control Systems: LRDS, HD pilot control;

4. Typical Applications: Light-duty milling machines, small mining loaders, road maintenance vehicles, small wet sprayers.

5. Advantages and Disadvantages: Balances speed and flow rate, suitable for medium loads; insufficient single-pump flow for high-power equipment, so two pumps are often used in series.

A11VO95

1. Basic Parameters: 93.5 cc/r, maximum 2350 r/min, classic displacement for medium-sized equipment;

2. Structural Features: Larger cylinder block and plunger dimensions provide better pressure stability and lower temperature rise during prolonged continuous operation;

3. Common Control Systems: LRDS; compatible with both paving and earthmoving machinery;

4. Typical Applications: Medium-duty wheel loaders, asphalt pavers, small concrete wet sprayers, and main pumps for road rollers.

5. Advantages and Disadvantages: Well-balanced overall performance, large installed base, and widely available spare parts; insufficient flow rate for large concrete pump trucks, so it is used only as an auxiliary pump.

A11VO130

1. Basic Specifications: 130 cc/r, maximum 2100 r/min; standard main pump for concrete machinery;

2. Structural Features: Enlarged suction chamber with excellent self-priming capability; the A11VLO oil-supplementation version is unnecessary for the vast majority of operating conditions; highly integrated valve block;

3. Common Control Systems: LRDS (constant power + load-sensing), industry standard; EP electronic control is used in smart concrete pump trucks;

4. Typical Applications: 37/43-meter concrete pump trucks, medium-sized wet spraying trucks, motor graders, and medium-sized mining drill rigs;

5. Advantages and Disadvantages: Flow, pressure, and power are perfectly matched to mainstream construction equipment, and spare parts are readily available; however, the single-pump flow rate is insufficient for extra-large concrete pump trucks, which require the 190/260 models.

A11VO145

1. Basic Parameters: 145 cc/r, maximum 2200 r/min; higher RPM than the 130/190 models in the same displacement class;

2. Structural Features: Optimized cylinder block design for reduced vibration during high-speed operation; stable self-priming capability, eliminating the need for an internal makeup pump;

3. Common Controls: LRDS, LRDU2 (displacement limiter adapted for low-horsepower engines);

4. Typical Applications: Large wheel loaders (5 metric tons and above), medium-sized road milling machines, and underground mining haulage vehicles;

5. Advantages and Disadvantages: Delivers higher flow rate than the 130 model at equivalent RPM, making it suitable for high-flow earthmoving equipment; rarely used in concrete pump trucks.

A11VO190

1. Basic Specifications: 193 cc/r, maximum 2100 r/min; designed specifically for high-flow, heavy-duty equipment;

2. Structural Features: The standard A11VO has weak self-priming capability and is highly prone to cavitation, screeching, and wear under high loads and high speeds; therefore, the A11VLO190 version with a makeup oil pump is uniformly selected for engineering applications; the housing is thickened, and internal friction pairs are reinforced;

3. Common Control Systems: LRDS and EPD1 electro-proportional electronic control;

4. Typical Applications: 48/56-meter large concrete pump trucks, heavy-duty mining roadheaders, and high-flow wet spraying rigs;

5. Advantages and Disadvantages: Single-pump flow rate is sufficient to drive large hydraulic cylinder motors; the version without a makeup pump has an extremely high failure rate and higher procurement costs.

A11VO260

1. Basic Parameters: 260 cc/r, maximum 2000 r/min, highest output flow rate in the entire series;

2. Structural Features: Cylinder block, plungers, and distribution plate are all enlarged and widened; the housing is thickened for pressure resistance; the standard A11VO260 model must not be installed independently; the A11VLO260 model with a built-in makeup pump must be selected to ensure forced oil supply and eliminate cavitation; the through-shaft design allows for series connection with large-capacity auxiliary pumps;

3. Common Control Methods: EPD1 electronic control, LRDS hydraulic control;

4. Typical Applications: Ultra-large concrete pump trucks with a reach of 60 meters or more, large-scale underground mining equipment, and high-flow tunnel boring equipment;

5. Advantages and Disadvantages: A single pump can meet the flow requirements of ultra-high-flow systems, eliminating the need for a dual-pump combined flow configuration; however, due to its large size, weight, and high cost, it is suitable only for heavy-duty equipment.

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