Rexroth A10VSO28DFR/31R‑PPA12N00 Variable Axial Piston Pump
Overview and correct ordering
This is a swashplate-type, variable-displacement axial piston pump for open‑circuit hydrostatic drives. The industry‑standard short code is typically written A10VSO28DFR1/31R‑PPA12N00; an alternative prefix AA10VSO… is sometimes used by certain distributors but refers to the same A10VSO family and size. The pump features pressure/flow (load‑sensing) compensation via the DFR1 control, ISO 3019‑2 2‑hole flange mounting, SAE side-ported connections, and is suitable for both mobile and industrial applications. The control provides pressure limiting and power-limiting behavior to improve efficiency and stability; it does not replace the need for a system relief valve.
Key specifications
Item | Value |
|---|---|
Displacement (Vg) | 28 cm³/rev |
Nominal pressure (p nom) | 280 bar |
Maximum pressure (p max) | 350 bar |
Max. continuous speed (at p nom, full disp.) | ≈ 3000 rpm |
Typical max. speed (size‑dependent) | up to ≈ 3000 rpm |
Control | DFR1 pressure/flow (load-sensing) |
Direction of rotation | R = clockwise (viewed on shaft end) |
Sealing material | P = NBR with FKM shaft seal |
Shaft end | P = tapered shaft 1:5, key per DIN 6885 |
Mounting flange | A = ISO 3019‑2 2‑hole |
Porting | 12 = SAE flange ports, side, opposite, UNC thread |
Through drive | N00 = without through drive |
Approx. weight | ≈ 15 kg |
Notes: Ratings and dimensions are per A10VSO size 28 data; always confirm the complete type code and data sheet for your variant.
Model code decode
A10VSO = swashplate variable pump, open circuit
28 = nominal displacement 28 cm³/rev
DFR1 = pressure/flow (load-sensing) control, hydraulic with pressure limiting
31 = product series
R = rotation clockwise (L = counterclockwise)
P = sealing: NBR body / FKM shaft seal
P = shaft: tapered 1:5, key DIN 6885
A = mounting flange: ISO 3019‑2, 2‑hole
12 = ports: SAE flange, side, opposite, UNC screws
N00 = no through drive (other codes available for tandem/auxiliary pumps)
This breakdown aligns with Rexroth’s standard A10VSO ordering rules.
Performance and application guidance
Flow is proportional to drive speed and swashplate angle; DFR1 maintains set pressure while varying displacement to meet demand, reducing heat and improving response.
Suited to open‑circuit systems in construction machinery, mining/industrial drives, and other applications needing precise flow control; commonly paired with proportional valves for closed‑loop control strategies.
For continuous operation, respect p nom = 280 bar and n max ≈ 3000 rpm (size‑ and control‑dependent); ensure adequate suction and system filtration.
Installation and commissioning essentials
Use mineral oils (HL/HLP); with FKM seals, many HF fluids are also compatible—verify fluid compatibility with the data sheet.
The unit has two housing oil drain holes; case drain must return below the minimum oil level and remain free of pressure build‑up.
Observe correct suction conditions and cleanliness; the A10VSO is designed for open‑circuit use.
Safety note: pressure control/limiting functions do not provide overpressure protection—fit a system relief valve. Project planning, assembly, and commissioning should be performed by qualified personnel in accordance with Rexroth instructions.
