Product Overview
The A10VO45DFR/52L-VUC64N00 is a Bosch Rexroth A10VO Series swashplate-type axial piston variable displacement pump with a displacement of 45 cm³, belonging to the Series 52 medium-pressure open-circuit family. Featuring DFR (pressure and flow compensation / load-sensing) control, it operates at a nominal pressure of 280 bar and can withstand peak pressures up to 350 bar, making it a widely adopted high-efficiency pump for construction machinery, agricultural equipment, and industrial hydraulic systems.
Manufactured to original Bosch Rexroth specifications with guaranteed drop-in interchangeability, this pump directly replaces the OEM A10VO45DFR/52L-VUC64N00 without modification. Critical rotating components — including the cylinder block, pistons, valve plate, and drive shaft — are precision-machined to OEM tolerances. The mounting flange (ISO/SAE 2-hole standard), spline configuration, and port locations are identical to the original. Every unit undergoes 100% simulated working-condition dyno testing prior to shipment, including rated pressure cycling, DFR control response verification, and leakage inspection, ensuring volumetric efficiency, pressure stability, and dynamic response meet OEM-equivalent standards.
Technical Specifications
Model: A10VO45DFR/52L-VUC64N00
OEM Material #: R902504305
Series: Rexroth A10VO Series 52
Type: Swashplate axial piston variable displacement pump (open circuit)
Displacement: 45 cm³/rev
Nominal Pressure: 280 bar
Maximum Pressure: 350 bar
Maximum Speed: 2,600 rpm (A10VO45 configuration)
Control Type: DFR pressure & flow compensation (load sensing), standard Δp setting 14 bar, adjustable 14–22 bar
Control Response: Short control response time, DR F controller for precise flow and pressure regulation
Rotation: Counter-clockwise (viewed from shaft end, L = left-hand)
Mounting Flange: ISO/SAE standard 2-hole
Shaft: ISO standard splined shaft
Port Configuration: Working port B (SAE), suction port S (SAE)
Seal Material: FKM (fluororubber)
Weight: Approx. 30 kg
Hydraulic Fluid: Mineral-based hydraulic oil (ISO VG 32–68)
Filtration: ISO 4406 cleanliness level 20/18/15 or better
Key Technical Advantages
1. Precision Swashplate Rotary Group with High Volumetric Efficiency
The A10VO45 utilizes Rexroth’s proven swashplate rotary group design, with pistons reciprocating axially within the cylinder block bores. Cylinder bores are precision-honed with micron-level clearances, minimizing internal leakage. A stable hydrodynamic lubrication film forms between the swashplate and slippers, maintaining high volumetric efficiency and reducing energy loss and heat generation at 280 bar nominal pressure.
2. DFR Load-Sensing Control — Power on Demand
The DFR control integrates both pressure compensation and flow compensation (load sensing) functions. The pump delivers only the flow and pressure actually required by the system; excess flow is automatically eliminated by reducing the swashplate angle to near-zero displacement. This fundamentally eliminates the energy waste associated with fixed-displacement pumps that dump excess flow through relief valves. In variable-load applications, the A10VO45 significantly reduces system heat generation, extends hydraulic fluid service life, and lowers fuel consumption.
3. Short Control Response Time with High Control Precision
Equipped with the DR F controller (X port open), this model features short control response times, enabling rapid displacement adjustment during fast load changes to ensure precise and smooth actuator motion. The standard differential pressure setting is 14 bar (adjustable 14–22 bar), allowing precise matching of flow control sensitivity to system requirements.
4. High-Strength Cast Iron Housing with Compact Lightweight Design
The pump housing is cast from high-strength iron with wall thickness distribution optimized through finite element analysis, achieving structural rigidity while maintaining a lightweight package — approximately 30 kg total weight, delivering an excellent power-to-weight ratio for its displacement class. The compact mounting envelope with standard ISO/SAE 2-hole mounting flange facilitates direct installation on engine PTO or drive ends.
5. Low-Noise Operation and Long Service Life
The swashplate design and optimized valve plate flow passage geometry effectively suppress pressure pulsation and fluid-borne noise, maintaining low noise levels even at the maximum speed of 2,600 rpm. FKM fluororubber seals are suitable for high-temperature applications, and the precision-machined bearing system ensures long service life under demanding operating conditions.
Application Areas
The A10VO45DFR/52L-VUC64N00 is widely used in the following equipment:
Excavators (medium-tonnage main hydraulic pump)
Wheel loaders hydraulic systems
Telescopic handlers
Concrete pump trucks hydraulic drives
Agricultural machinery (tractor hydraulics, combine harvesters)
Lifting equipment (mobile cranes, truck-mounted cranes)
Municipal vehicles (sweepers, snow removal equipment)
Industrial hydraulic power units (injection molding machines, presses)
Expert Maintenance Tips
Pre-Installation Checks: Verify that the pump shaft spline matches the drive end configuration (ISO standard spline). Apply a light coating of grease to the spline surface. Ensure full contact between the mounting flange and the mounting pad. Never force the pump into position by tightening the fixing bolts, as this may cause abnormal bearing preload or housing deformation. Confirm that the rotation direction (L = left-hand, viewed from shaft end) matches the drive end.
Oil Cleanliness Control: A10VO series pumps are sensitive to fluid contamination. System oil cleanliness should be maintained at ISO 4406 level 20/18/15 or better. When hydraulic fluid viscosity is below 10 cSt (mm²/s) — for example, under high-temperature conditions — a cleanliness level of 19/17/14 is required. Suction filters should be rated at 10 μm or finer; return-line filters at 10 μm or finer are recommended.
DFR Control Line Inspection: Periodically inspect load-sensing (LS) control line connections for tightness. No leakage or blockage should exist in the control circuit. If sluggish flow response, unstable pressure, or system oscillation is observed, first inspect the control lines, damping orifices, and pressure compensator valve.
Start-Up and Break-In: During initial start-up, operate at low speed and low pressure for 10–15 minutes to purge air from the system and check all connections for leakage. Fill the pump case with clean hydraulic oil through the case drain port before starting to prevent dry-start damage to the porting pair.
Case Drain Management: The case drain line must remain unrestricted; case pressure must not exceed 2 bar (gauge). Route the drain line directly to the reservoir below the oil level to avoid backpressure affecting pump displacement control. Periodically inspect the drain line for loosening or wear caused by vibration.
