Product Overview
The A4VSO250DP/30R-PPB13N00 is the 250 cc-class core model within the Bosch Rexroth A4VSO series 30 of open-circuit axial piston variable displacement pumps. The A4VSO series features a swash plate design where pump flow is proportional to input drive speed and displacement, with output flow steplessly variable via swash plate angle adjustment. Designed for open-circuit hydrostatic drives, the series operates at a nominal pressure of 350 bar with peak pressure of 400 bar.
A4VSO Series Core Features: Axial piston variable pump in swash plate design for hydrostatic drives in open circuit; flow proportional to drive speed and displacement; infinitely variable flow by adjusting the swash plate angle; excellent suction characteristics; low noise; long service life; modular design; short control response times; variable through drive options; visual swivel angle indicator; drive shaft capable of absorbing axial and radial loads; high power-to-weight ratio; suitable for operation with HF fluids.
Model Code Breakdown (for procurement and engineering reference):
A4VSO: Rexroth open-circuit swash plate axial piston variable pump
250: Nominal size (NG), geometric displacement 250 cm³/rev
DP: Pressure Control for Parallel Operation — suitable for pressure control of multiple A4VSO axial piston units in parallel operation; optional flow control (DPF) available
/30R: Series 30, clockwise rotation (viewed from shaft end)
PPB13N00: P = NBR seals; P = mounting flange code; B = port configuration; 13 = design variant; N00 = additional configuration code
DP Control Function Details:
DP is a pressure controller specifically designed for parallel operation of multiple A4VSO axial piston pumps. In multi-pump parallel systems, the DP controller coordinates pressure control between pumps to ensure stable system pressure. The recommended setting range for the DP controller is 50 to 350 bar, with 350 bar set as standard. The initial position in depressurized state is Vg max. When the operating pressure exceeds the pressure setting at the pressure control valve, the pump will regulate to a smaller displacement to reduce the control differential.
Drop-in Replacement Advantage: Manufactured to exact Rexroth OEM specifications, this pump achieves complete drop-in interchangeability with the original A4VSO series 30 for ISO 3019-2 mounting flange, shaft dimensions, SAE main port layout, and DP control module interface. Every pump undergoes 100% simulated load testing prior to shipment, validating 350 bar pressure loading, DP control response, and volumetric efficiency under conditions replicating real-world duty cycles.
Technical Specifications
Model A4VSO250DP/30R-PPB13N00:
Model Code: A4VSO250DP/30R-PPB13N00
Series: Rexroth A4VSO Series 30 (Open Circuit, Swash Plate Design)
Nominal Size: NG 250
Geometric Displacement: 250 cm³/rev
Nominal Pressure: 350 bar (continuous)
Peak Pressure: 400 bar (intermittent)
Maximum Speed (at Vg max): 1500 rpm
Maximum Flow (at Vg max and nnom): 375 L/min
Maximum Theoretical Torque (Δp = 350 bar): 1391 N·m
Theoretical Torque (Δp = 100 bar): 398 N·m
Maximum Power (Δp = 350 bar): 219 kW
Control Type: DP — Pressure Control for Parallel Operation
Pressure Adjustment Range: 50–350 bar (standard setting 350 bar)
Initial Position (depressurized): Vg max
Rotation: Clockwise (viewed from shaft end, /30R code)
Mounting Flange: ISO 3019-2 4-hole, Ø224 mm
Shaft: Cylindrical Ø60 mm, key 18×11×100 (P code)
Main Ports: Suction S — SAE 3″; Pressure B — SAE 1 1/2″; Drain T — M42×2
Seal Material: NBR (nitrile rubber)
Housing Material: High-strength cast iron
Fluid Cleanliness: 20/18/15 (ISO 4406) or better
Operating Temperature Range: -40°C to +90°C
Viscosity Range: 10–1000 mm²/s, recommended 16–36 mm²/s
Weight: Approx. 184 kg
Through Drive Capability: N00 = without through drive (standard configuration)
A4VSO Series Displacement Size Reference:
A4VSO40: 40 cm³/rev, max speed 2600 rpm
A4VSO71: 71 cm³/rev, max speed 2200 rpm
A4VSO125: 125 cm³/rev, max speed 1800 rpm
A4VSO180: 180 cm³/rev, max speed 1800 rpm
A4VSO250: 250 cm³/rev, max speed 1500 rpm
A4VSO355: 355 cm³/rev, max speed 1500 rpm
A4VSO500: 500 cm³/rev, max speed 1320 rpm
A4VSO750: 750 cm³/rev, max speed 1200 rpm
A4VSO1000: 1000 cm³/rev, max speed 1000 rpm
Key Technical Advantages
1. DP Parallel Pressure Control with Multi-Pump Coordination
The A4VSO250DP/30R-PPB13N00 is equipped with a DP parallel pressure controller. In systems with multiple A4VSO axial piston pumps operating in parallel, the DP controller coordinates pressure control between pumps to ensure stable system pressure. When operating pressure exceeds the pressure control valve setting, the DP controller automatically reduces pump displacement to reduce the control differential. The recommended setting range is 50–350 bar, with 350 bar set as standard. This control method is particularly suitable for large flow hydraulic systems requiring multi-pump parallel operation, such as large hydraulic power units and central oil supply systems.
2. Swash Plate Design with High Power Density
The A4VSO series employs a swash plate axial piston rotary group design where swash plate inclination angle determines piston stroke and displacement. The 250 size delivers maximum power of 219 kW, maximum flow of 375 L/min, and maximum torque of 1391 N·m at 350 bar nominal pressure, leading its displacement class in power density. The swash plate configuration offers compact axial dimensions suitable for space-constrained industrial installations.
3. Excellent Suction Characteristics with Low Noise Operation
The A4VSO series delivers excellent suction characteristics, with optimized suction flow passages reducing cavitation risk and aeration damage. The housing is precision-cast from high-strength cast iron, with the material’s damping characteristics effectively suppressing structural vibration and fluid-borne noise, achieving industry-leading noise levels.
4. Long Service Life with Robust Construction
The A4VSO series is renowned for exceptionally long service life, employing long-life, high-precision bearings selected through system-level load analysis for long-term stable operation at 350 bar continuous pressure. The drive shaft is capable of absorbing axial and radial loads, enhancing system design flexibility. The ISO 3019-2 metric 4-hole mounting flange provides a robust mounting foundation.
5. Through Drive and Modular System Expansion
The A4VSO series supports through drive, allowing direct mounting of subsequent pumps of same or smaller size on the rear of the main pump for single-motor multi-pump compound hydraulic systems. Modular design supports flexible combinations of various control modes and additional functions, with standardized mounting interfaces requiring no adaptation for replacement, significantly reducing equipment downtime.
6. Concrete Pump Truck Optimization
The A4VSO250 series is a core power component in concrete pump truck hydraulic systems. Its high power density, excellent suction characteristics, and low noise operation make it capable of meeting the continuous high-intensity operational demands of concrete pump trucks on construction sites. The 250 cc specification’s flow and pressure output precisely matches the power requirements of the truck’s pumping system, ensuring stability and efficiency of pumping operations.
Application Areas
Concrete Pump Trucks: Main hydraulic pump for pumping systems (one of the core application areas for the A4VSO250 series)
Metallurgical Equipment: Continuous casting machine hydraulic systems, rolling mill hydraulic screwdown devices, steelmaking furnace hydraulic power sources
Forging Equipment: Open-die forging presses, closed-die forging press main hydraulic pumps
Mining & Tunneling: Tunnel boring machine thrust hydraulic systems, mine hoist hydraulic drives
Cement & Building Materials: Roller press hydraulic systems, vertical mill hydraulic loading devices
Marine & Offshore: Deck machinery hydraulic systems, large steering gear hydraulic power units
Test Equipment: Large hydraulic test benches, fatigue testing machine hydraulic power sources
Industrial Hydraulic Power Units: Large hydraulic power units, central oil supply systems
Expert Maintenance Tips
1. Hydraulic Fluid Cleanliness
The A4VSO series DP control spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 4406 20/18/15 or better. Recommended fluids are ISO VG32 or VG46 anti-wear hydraulic oils with a recommended viscosity range of 16–36 mm²/s. Install a 10 μm absolute-rated filter element at the pump inlet. Replace elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first.
2. DP Parallel Pressure Controller Setting and Adjustment
The DP pressure controller has a recommended setting range of 50–350 bar, with 350 bar set as standard. Set the pressure 15–20 bar above the maximum working load pressure, never exceeding the 350 bar nominal pressure. In multi-pump parallel systems, ensure that the DP controller settings of all pumps are consistent for coordinated pressure control. Adjust only with the system at zero load. Rotate the adjustment screw slowly and verify stable pressure gauge readings before proceeding. Notice: The pressure controller is not a safeguard against pressure overload. A pressure relief valve must be installed in the hydraulic system.
3. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum permissible back pressure is 2 bar (0.2 MPa). The A4VSO series is equipped with two case drain ports. The drain outlet must terminate below oil level at all times to prevent air ingestion. The drain line diameter must not be smaller than the pump case drain port size. For 250 cc class large displacement pumps, case drain flow is substantial — drain line design must fully account for flow demand to avoid excessive case pressure from pipe resistance.
4. Pre-Start Priming and Air Bleeding
Before first start, fill the pump housing with clean hydraulic fluid through the case drain port. After installation, turn the drive shaft by hand several revolutions to confirm free rotation without binding. Start at low speed with zero load and run for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only then apply load.
5. Installation Alignment and Plumbing
Ensure drive shaft alignment with radial deviation not exceeding 0.05 mm. Minimum absolute pressure at the suction port must be maintained at 0.08 MPa (absolute) or higher to prevent cavitation. Inlet velocity must not exceed 1.5 m/s. The pump mounting position can be freely selected, but the case drain port must always be positioned at the top.
6. Operating Temperature and Viscosity Control
The A4VSO250 series operating temperature range is -40°C to +90°C, with an optimum viscosity range of 16–36 mm²/s. For continuous high-temperature applications, select a higher viscosity grade hydraulic fluid or install an oil cooler. Monitor oil temperature during operation to ensure it remains within the permissible range.
