Understanding the A10VSO Model Code
Every axial piston pump carries a model code that tells you exactly what you have. Whether you are specifying a new pump or sourcing a replacement, knowing how to read the A10VSO model code saves time and prevents costly mistakes.
What Each Segment of the Code Means
The A10VSO model code follows a fixed structure. Take the example A10VSO 71 DFR/31R-PPA12N00:
- A10VSO — Variable displacement axial piston pump, swashplate design, for open circuits
- 71 — Size: nominal displacement of 71 cm³ per revolution
- DFR — Control type: pressure and flow control (load sensing)
- 31 — Series: 31 (industrial model, 280 bar nominal)
- R — Direction of rotation: clockwise, viewed on the shaft end
- PP — Ports and connection standard
- A12 — Shaft type
- N00 — Seals and special options
Available Sizes in the Series 31 Platform
The A10VSO Series 31 is available in nominal sizes from 18 to 140 cm³/rev. Common industrial sizes include 28, 45, 71, 100 and 140.
Main Control Types in the Code
- DR — Constant pressure control
- DFR / DFR1 — Pressure and flow control (load sensing), the most common for industrial circuits
- FE / FED — Electric proportional flow control
- DFE1 — Electric proportional pressure and flow (P/Q) control
Why the Model Code Matters for Replacement
When ordering an aftermarket pump, the control type, series, size and rotation direction must all match your original unit. A mismatch in even one code segment can cause incorrect installation or poor performance. Always compare the full code from your pump nameplate against the replacement specification.
This guide is provided for general reference. Model codes vary slightly between series and revisions, so always verify against the original nameplate.
