Product Overview
The A10VSO45DR/31R-PPA12N00 is a Bosch Rexroth A10VSO Series 31 swashplate-type axial piston variable displacement pump with a nominal displacement of 45 cm³/rev, rated operating pressure of 280 bar (28 MPa), peak pressure capability of 350 bar (35 MPa), and maximum speed of 2600 rpm. At 1500 rpm, it delivers approximately 68 L/min output flow and weighs approximately 21 kg. Designed for hydrostatic drives in open circuits, the pump delivers output flow proportional to drive speed and displacement, with stepless variation via swashplate angle adjustment.
This model is equipped with DR constant pressure control (pressure controller), automatically adjusting the swashplate angle through an integrated pressure compensator. When system pressure reaches the set point, the pump automatically reduces displacement to only leakage flow, achieving constant pressure holding and energy-efficient operation. The DR control offers simple construction and fast response — particularly suitable for hydraulic fixtures, presses, injection molding machines, and other industrial hydraulic systems requiring sustained constant-pressure holding.
The pump features Series 31 standard design with an ISO 3019-2 metric mounting flange (2-hole), ISO keyed shaft, clockwise rotation (viewed from shaft end), standard FKM (Fluoroelastomer) seals, and 2 case drain ports, delivering excellent suction performance and low-noise operation. The pump supports 100% through-drive capability, enabling tandem connection with same-size A10VSO pumps or gear pumps for compact integration of multi-circuit hydraulic systems.
The companion model AA10VSO45DR/31R-PKC62K01 (Material Number R910962940) is an A10VSO tandem pump configuration with SAE-standard interfaces for the North American market, sharing a common drive shaft for independent multi-circuit control.
Every A10VSO45DR/31R-PPA12N00 undergoes 100% simulated duty-cycle testing prior to shipment — covering pressure holding, flow output, control response, and internal leakage — ensuring complete drop-in interchangeability with original Rexroth pumps without installation or plumbing modifications.
Technical Specifications
Model: A10VSO45DR/31R-PPA12N00
Brand: Bosch Rexroth
Series: A10VSO Series 31
Pump Type: Open-circuit swashplate axial piston variable displacement pump
Nominal Displacement: 45 cm³/rev
Rated Operating Pressure: 280 bar (28 MPa)
Peak Pressure: 350 bar (35 MPa)
Maximum Speed: 2600 rpm
Minimum Speed: 500 rpm
Output Flow at 1500 rpm: Approx. 68 L/min
Maximum Flow at 2600 rpm: Approx. 117 L/min
Maximum Power at 280 bar: Approx. 55 kW
Maximum Torque: 200 N·m
Control Type: DR constant pressure control (pressure controller)
Direction of Rotation: Clockwise (viewed from shaft end)
Mounting Flange: ISO 3019-2 metric, 2-hole
Shaft Type: ISO keyed shaft
Seals: FKM (Fluoroelastomer)
Case Drain Ports: 2
Through-Drive Capability: Yes, 100% torque transmission
Weight: Approx. 21 kg
Inlet Absolute Pressure Range: 0.8–30 bar
Case Drain Maximum Permissible Backpressure: ≤ 2 bar absolute
Fluid Cleanliness Requirement: NAS Class 8 (ISO 18/16/13), system filter 10 μm
Recommended Fluid: ISO VG32 / VG46 anti-wear hydraulic oil (L-HM)
Operating Temperature Range: -20 to +80 ℃, optimal 40–55 ℃
A10VSO Series 31 Same-Family Displacement Reference (nominal conditions):
A10VSO18: 18 cm³/rev, 280 bar rated, 350 bar peak, max 3000 rpm, flow at 2600 rpm approx. 59 L/min, weight approx. 12 kg
A10VSO28: 28 cm³/rev, 280 bar rated, 350 bar peak, max 3000 rpm, flow at 2600 rpm approx. 84 L/min, weight approx. 15 kg
A10VSO45: 45 cm³/rev, 280 bar rated, 350 bar peak, max 2600 rpm, flow at 2600 rpm approx. 117 L/min, weight approx. 21 kg
A10VSO71: 71 cm³/rev, 280 bar rated, 350 bar peak, max 2200 rpm, flow at 2200 rpm approx. 156 L/min, weight approx. 33 kg
A10VSO100: 100 cm³/rev, 280 bar rated, 350 bar peak, max 2000 rpm, flow at 2000 rpm approx. 200 L/min, weight approx. 45 kg
A10VSO140: 140 cm³/rev, 280 bar rated, 350 bar peak, max 1800 rpm, flow at 1800 rpm approx. 252 L/min, weight approx. 60 kg
Key Technical Advantages
1. DR Constant Pressure Control — Precise Pressure Holding and Energy Savings
The A10VSO45DR/31R-PPA12N00 employs DR constant pressure control, in which an integrated pressure compensator automatically adjusts the swashplate angle through system pressure feedback. When system pressure reaches the set point, the pump automatically reduces displacement to only leakage flow, achieving constant pressure holding; when system pressure drops, the pump automatically increases displacement to restore flow output. This control characteristic virtually eliminates relief losses during pressure-holding conditions, significantly reducing system heat generation and energy consumption. The DR control pressure adjustment range covers 20 bar to 280 bar (depending on specific configuration), suitable for hydraulic fixtures, presses, injection molding machines, and other industrial hydraulic systems requiring extended constant-pressure holding.
2. High Power Density and Compact Structure — 55 kW from 21 kg
The A10VSO45 delivers approximately 55 kW maximum power at 2600 rpm and 280 bar, weighing only approximately 21 kg, with power-to-weight ratio leading among comparable products. The swashplate axial piston design combined with an optimized rotary group achieves efficient power transmission within a compact structure. The pump’s mounting dimensions conform to ISO 3019-2 standards, enabling direct replacement with same-specification A10VSO pumps without modifying the mounting interface.
3. 100% Through-Drive — Flexible Multi-Pump System Integration
The A10VSO45DR/31R-PPA12N00 supports 100% through-drive capability, enabling tandem installation of same-size A10VSO axial piston pumps or gear pumps on the rear of the main pump for compact system configurations driven by a single prime mover. The through-drive interface features a K82-2 flange standard (5/8 in 9T 16/32DP spline), permitting installation of a second pump without additional support brackets under dynamic mass acceleration not exceeding 10g. This feature provides exceptional integration flexibility in multi-circuit hydraulic systems, reducing the number of independent power units and lowering piping complexity and installation costs.
4. Low Noise Operation and Excellent Suction Performance
The A10VSO series is renowned for low-noise operation, effectively suppressing pressure pulsation and fluid-borne noise through optimized valve plate flow passages and piston kinematics. The pump delivers excellent suction performance with an inlet absolute pressure range of 0.8–30 bar, combined with optimized suction flow passages ensuring adequate suction at high speeds to prevent cavitation damage. The dual case drain port design facilitates flexible drain line routing, ensuring case pressure remains within permissible limits.
5. Exceptional Field Interchangeability and Media Compatibility
The A10VSO45DR/31R-PPA12N00 features mounting flange (ISO 3019-2), shaft specifications (ISO keyed shaft), and port layouts conforming to Rexroth A10VSO Series 31 standards, enabling drop-in interchangeability with other A10VSO45 models of the same specification. The pump is compatible with mineral-based hydraulic oil and HF fire-resistant fluids, with FKM seals suitable for standard industrial hydraulic systems. For equipment currently using A10VSO45 series pumps, direct replacement installation is possible without modifying system installation interfaces or plumbing layouts.
Application Areas
Double-Pump Confluence Pavers: A10VSO45 used as open-circuit variable piston pump in double-pump confluence paver load-sensing hydraulic systems for coordinated travel and material feed control
Hydraulic Fixtures and Tooling: DR constant pressure control suitable for machine tool hydraulic fixture constant-pressure holding circuits with high pressure stability
Injection Molding and Die-Casting Machines: Hydraulic power sources for medium-to-large injection molding machines and die-casting equipment, DR control enabling energy-saving pressure holding
Hydraulic Presses: Constant pressure control systems for four-column and frame-type hydraulic presses
Metallurgical Auxiliary Equipment: Power sources for rolling auxiliary equipment and metallurgical auxiliary hydraulic systems
Construction Machinery: Various vehicle-mounted hydraulic systems and special-purpose modified equipment, such as auxiliary hydraulic circuits for loaders and excavators
Agricultural Machinery: Hydraulic hitch and steering systems for tractors and combine harvesters
Material Handling Equipment: Hydraulic power units for forklifts and pallet trucks
The A10VSO45DR/31R-PPA12N00 is ideally suited for small-to-medium power hydraulic systems requiring 280 bar continuous working pressure and constant pressure control — the classic configuration for industrial hydraulic power units and mobile machinery auxiliary hydraulic circuits.
Expert Maintenance Tips
1. Shaft Alignment and Coupling Requirements
Maintain concentricity between the pump shaft and drive shaft within 0.05 mm. Flexible couplings are strongly recommended to accommodate minor angular misalignment. The A10VSO45DR/31R-PPA12N00 features an ISO 3019-2 standard mounting flange and ISO keyed shaft — never strike the shaft end during installation to avoid damaging internal seals and bearings. Tighten mounting flange bolts in diagonal sequence to the specified torque. Couplings must be equipped with protective guards.
2. Pre-Start Filling and Venting Procedure
Before initial startup, the pump housing must be filled with clean hydraulic oil and maintained full during operation. Slowly fill through the case drain port with ISO VG32 or VG46 anti-wear hydraulic oil to ensure adequate lubrication, cooling, and sealing during startup. Start the pump in jog mode until the pump and piping are sufficiently filled and vented. After complete venting, run at low pressure for 5–10 minutes, check piping and component tightness, then gradually increase to rated pressure.
3. DR Pressure Controller Commissioning
The DR pressure controller setting should be at least 10–15 bar below the system relief valve setting. During commissioning, first turn the pressure setting screw to the lowest pressure position, then gradually increase to the target pressure. Pressure adjustment must be performed with the pump at full displacement and low operating pressure to avoid system pressure oscillation. In multi-pump systems, stagger the DR controller settings to prevent simultaneous adjustment-induced pressure oscillation.
4. Fluid Cleanliness and Filtration
Fluid cleanliness of NAS Class 8 (ISO 18/16/13) or better is recommended. Use system filters with 10 μm filtration accuracy. Avoid suction filters, which increase suction resistance and cavitation risk; if essential, use with a vacuum switch monitor. Install a breather filter with filtration accuracy ≤10 μm on the reservoir and regularly check oil level and fluid condition. Hydraulic oil working temperature should not exceed 80 ℃, with optimal operating temperature of 40–55 ℃.
5. Case Drain Line Requirements
The case drain line should be independently routed to the reservoir, avoiding shared return lines. Case drain backpressure must not exceed 2 bar absolute and must not be higher than 0.5 bar above inlet pressure. Drain line diameter should be sufficiently large to ensure free drainage under cold-start high-viscosity conditions. Installing a pressure gauge or sensor on the drain line is recommended to monitor case pressure status. Before restarting after extended shutdown, manually rotate the shaft several turns to verify free rotation.
