Advanced Control Valve Breakdown
Each of these specific codes features a highly advanced, application-specific control valve:
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A10VO28ED72/31L-VSC12N00P: Features a 28cc displacement with ED72 Electro-Hydraulic Pressure Control. This allows the vehicle’s onboard computer to proportionally adjust hydraulic pressure via an electrical signal, perfect for smart machinery requiring dynamic force adjustment.
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A10VO28DFR1/31L-VSC11N00: Features a 28cc displacement with DFR1 Load Sensing Control. The “1” indicates the X-channel is plugged, providing an optimized pressure and flow response for standalone mobile circuits without external load-sensing lines.
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A10VO71DRS/32L-VSD12K68: Features a massive 71cc displacement with DRS Load Sensing Control. Additionally, this model is equipped with a K68 rear through-drive, allowing you to mount an additional gear or piston pump directly to the back of this unit to power auxiliary vehicle functions.
Exact Replacement Data Matrix
| Specification | Model 1 | Model 2 | Model 3 |
| Exact Part Code | A10VO28ED72/31L-VSC12N00P | A10VO28DFR1/31L-VSC11N00 | A10VO71DRS/32L-VSD12K68 |
| Pump Series | A10VO (Mobile Hydraulics) | A10VO (Mobile Hydraulics) | A10VO (Mobile Hydraulics) |
| Displacement | 28 cc/rev | 28 cc/rev | 71 cc/rev |
| Control Valve | ED72 (Electro-Proportional) | DFR1 (Load Sensing) | DRS (Load Sensing) |
| Rotation | Left-Hand (Counter-Clockwise) | Left-Hand (Counter-Clockwise) | Left-Hand (Counter-Clockwise) |
| Seal Material | FKM (Viton) | FKM (Viton) | FKM (Viton) |
| Through-Drive | N00 (None) | N00 (None) | K68 (Rear mounting option) |
Frequently Asked Questions (FAQs)
Q1: Can I install a Left-Hand (L) rotation pump on a Right-Hand drive system? No. Installing a pump with the incorrect rotation direction will cause immediate, catastrophic internal damage as the pump will not draw oil or build pressure correctly. You must verify your machine’s drive rotation matches the “L” designation in these part numbers.
Q2: What is the difference between DFR and DFR1 control? Both are Load Sensing (pressure and flow) controls. However, the DFR1 configuration means the external X-channel port is plugged at the factory. This is typically used in specific mobile closed-center valve setups where the external load signal line is not required or routed differently.
Q3: What does the K68 code mean on the A10VO71DRS model? The K68 suffix indicates that this pump features a through-drive with an SAE mounting flange and splined coupling on the rear cover. This allows you to attach a secondary hydraulic pump (such as a steering or cooling pump) directly to the back of the main A10VO71 unit.
Q4: Will the ED72 control plug directly into my machine’s existing wiring? The ED72 is an electro-hydraulic proportional control. If your equipment originally came with this exact A10VO28ED72 configuration, the solenoid valve will be perfectly matched to your machine’s electronic control unit and voltage requirements for a direct drop-in replacement.
Q5: Why do these specific models use Viton (FKM) seals instead of standard NBR? The “V” in the model codes (VSC and VSD) signifies Viton seals. These are engineered for heavy-duty mobile applications where the hydraulic system experiences higher operating temperatures, or when fire-resistant and environmentally friendly synthetic hydraulic fluids are used.
A10VO28ED72/31L-VSC12N00P
A10VO28DFR1/31L-VSC11N00
A10VO71DRS/32L-VSD12K68-S3397
A10VO28DFR1/31L-VSC12N00
A10VO100DFR1/31R-VSC62K07-SO143
A10VO71DFR1/31R-VSC94K07-SO143
A10VO60 DFR1/52R-VUC62K68-SO200
A10VO60DFR1/52R-PSD62K02-SO200
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