A10VO28 A10VO18 DFR DFLR Axial Piston Pump | 280 bar | Rexroth

Product Overview

The A10VO series axial piston variable displacement pumps represent a classic product line within the Bosch Rexroth hydraulic transmission platform, featuring the proven swashplate design specifically developed for open-circuit hydraulic systems. The series offers multiple displacement options ranging from 18 to 140 cm³, covering applications from light-duty to heavy-duty industrial and mobile equipment. This product line covers two popular displacement models — A10VO18 and A10VO28 — equipped with DFR (pressure-flow control / load-sensing) and DFLR (pressure-flow-power control) control options. Specific models include:

• A10VO28DFR/31R-PKC62K01 (DFR pressure-flow control)

• A10VO28DFLR/31R-PSC62N00 (DFLR pressure-flow-power control)

100% Interchangeability Guarantee: Our pumps strictly adhere to Bosch Rexroth A10VO original mounting dimensions and port layouts, enabling drop-in replacement without modifications to existing piping or brackets. Every unit undergoes 100% simulated duty-cycle testing under actual load conditions to validate performance parameters before shipment, ensuring immediate reliability upon installation.

Quality & Manufacturing Standards: The housing is manufactured from high-strength cast iron, with critical tribological pairs (cylinder barrel/valve plate, pistons/slippers) precision-ground and heat-treated. Premium-grade bearings ensure long service life and low-noise operation under high-pressure, high-speed conditions.

Technical Specifications 

Series General Specifications (A10VO Series 31):

• Design: Swashplate axial piston variable displacement pump

• Circuit Type: Open circuit

• Rated Working Pressure: 280 bar (4,000 psi)

• Maximum Peak Pressure: 350 bar (5,100 psi)

• Mounting Flange: ISO 3019-1 (SAE) 2-bolt flange

• Port Standard: SAE J518 split flange

• Case Drain Ports: 2 standard drain ports

• Through-Drive: Available for mounting additional pumps (same nominal size)

• Rotation: Clockwise (R) or counterclockwise (L) optional

A10VO18:

• Displacement: 18.0 cm³/rev

• Rated Working Pressure: 280 bar (4,000 psi)

• Maximum Peak Pressure: 350 bar (5,100 psi)

• Maximum Speed: 3,600 rpm

• Theoretical Flow (@1,500 rpm): 27 L/min

• Weight: Approx. 12.9 kg

A10VO28 (DFR Control):

• Model Code: A10VO28DFR/31R-PKC62K01

• Displacement: 28.0 cm³/rev (1.71 in³/rev)

• Rated Working Pressure: 280 bar (4,000 psi)

• Maximum Peak Pressure: 350 bar (5,100 psi)

• Maximum Speed: 3,600 rpm

• Theoretical Flow (@1,450 rpm): 40.6 L/min

• Theoretical Flow (@3,600 rpm): 100.8 L/min

• Control Type: DFR (pressure-flow control / load-sensing)

• Weight: Approx. 15 kg (33 lbs)

• Mounting Flange: ISO 3019-1 (SAE) 2-bolt flange

A10VO28 (DFLR Control):

• Model Code: A10VO28DFLR/31R-PSC62N00

• Displacement: 28.0 cm³/rev (1.71 in³/rev)

• Rated Working Pressure: 280 bar (4,000 psi)

• Maximum Peak Pressure: 350 bar (5,100 psi)

• Maximum Speed: 3,600 rpm

• Theoretical Flow (@1,450 rpm): 40.6 L/min

• Theoretical Flow (@3,600 rpm): 100.8 L/min

• Control Type: DFLR (pressure-flow-power control)

• Weight: Approx. 15 kg (33 lbs)

• Mounting Flange: ISO 3019-1 (SAE) 2-bolt flange

• Drive Shaft: SAE splined shaft ANSI B92.1a

Key Technical Advantages

1. Load-Sensing Control — On-Demand Flow Delivery, Significant Energy Savings
The DFR control integrates pressure compensation and flow control functions, sensing actual system load demand through the LS (load-sensing) port. The pump delivers only the flow and pressure required by the actuators, eliminating energy losses caused by overflow from fixed displacement pumps. This “on-demand” delivery mechanism translates directly into fuel savings and substantial reduction in system heat generation.

2. Built-in Pressure Cut-Off Protection — Dual Safety Assurance
The pump features an integrated adjustable pressure limiter (field-adjustable up to 4,100 PSI). When system pressure reaches the set value, the pump automatically reduces output flow to zero if necessary, ensuring system pressure never exceeds the safety threshold. This provides secondary overpressure protection, significantly enhancing operational safety.

3. High Power Density and Compact Design
The A10VO series achieves a compact, lightweight construction through optimized swashplate architecture. The A10VO28 weighs only approximately 15 kg, delivering an excellent power-to-weight ratio — ideal for mobile equipment and industrial machinery with strict space constraints.

4. Long Service Life and Low-Noise Operation
High-strength cast iron housing, premium-grade bearings in critical rotating components, precision-machined piston/slipper assemblies, and optimized valve plate design ensure long-term reliability under 280 bar rated pressure and 350 bar peak pressure. Optimized suction characteristics and precision manufacturing deliver low operating noise.

5. Through-Drive Capability — Flexible System Expansion
The A10VO series features a through-drive configuration, supporting tandem mounting of additional hydraulic pumps on the same axis (up to the same nominal size). This design provides exceptional layout flexibility for complex hydraulic systems, enabling functional expansion without additional power input interfaces.

Application Areas

The A10VO series axial piston variable pumps are widely deployed in open-circuit hydraulic drive systems across the following applications:

• Industrial Hydraulic Systems — hydraulic power units for machine tools, injection molding machines, presses

• Mobile Machinery — hydraulic systems for excavators, loaders, cranes and other construction equipment

• Agricultural Machinery — hydraulic drives for combine harvesters, tractors and other farm equipment

• Material Handling Equipment — forklifts, stackers and other warehouse logistics equipment

• Municipal and Sanitation Vehicles — street sweepers, garbage compactors and other specialty vehicles

• Marine and Port Machinery — deck machinery, winches and other offshore equipment

Expert Maintenance Tips

1. Installation Orientation Requirements
Pump installation orientation is flexible; however, it is strongly recommended to mount the control valve (DFR/DFLR) on the top or side — with the top position being optimal. Ensure adequate clearance for control valve adjustment and future maintenance access.

2. Suction Conditions and Housing Priming
The A10VO series offers excellent suction characteristics; nevertheless, ensure the suction line is free from leaks and blockages with oil viscosity within the recommended range. Before initial start-up or after extended downtime, the housing must always be filled with hydraulic fluid. Pre-fill through case drain ports prior to start-up to prevent dry-running damage to critical tribological pairs.

3. Filtration and Fluid Cleanliness
Recommended filtration per ISO 4406 cleanliness level of 19/17/14 or better. Return line and suction filters should be inspected and replaced regularly to ensure fluid cleanliness meets axial piston pump requirements.

4. Initial Start-Up and Break-In
For first-time operation, run the pump at low speed (idle) with no load for 5–10 minutes to purge air from the system and allow proper oil film establishment on all tribological pairs before gradually applying load.

5. Control Oil Circuit Connection (DFR Control Special Attention)
DFR (load-sensing) control requires connection of the X port (LS port) to the load signal circuit of the main control valve. Ensure the LS line is correctly connected, leak-free, and unblocked; otherwise, flow control accuracy and system response characteristics will be compromised. The DFLR control additionally incorporates power limiting functionality — power limit values must be correctly set per the technical manual.