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壳体泄油孔; 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.
