A10VNO vs. A10VO – Key Differences for System Design

Though from the same family, these two pumps serve distinct pressure regimes:

• A10VO – medium‑pressure duty, rated up to 280 bar nominal (350 bar peak). Used for main lifts and steering.

• A10VNO – low‑pressure optimized, rated up to 240 bar nominal (280 bar peak). Designed for high‑speed, high‑flow applications where pressure is secondary.

Example: A combine harvester uses an A10VO for the header lift (high force) and an A10VNO for the radiator cooling fan (high speed, variable flow). Specifying a high‑pressure pump for a fan would add cost and parasitic loss.

Technical Specifications – A10VNO Series 52/53

Built for durability in dirty, mobile conditions. Displacements from 28 to 85 cc/rev.

Performance strengths:

• High‑speed rated – directly engine‑mounted for fan drives, tolerant of overspeed.

• Through‑drive capability – allows a second pump to be bolted on the rear without extra adapters.

• Low noise – up to 70% quieter than gear pumps in fan applications, thanks to reduced pulsation.

Control Options – Tailoring the Pump

Rexroth offers several hydraulic regulators, identified by model suffix:

• DRS (pressure + flow) – the most common. Combines pressure cut‑off with load‑sensing. Ideal for fan drives where flow varies with engine speed.

• DRG (remote pressure) – lets you adjust the pressure setting via an external hydraulic signal. Used for selectable pressure limits on different tools.

• DRF (flow control) – maintains constant flow regardless of input speed (within limits). Applied in steering or constant‑speed circuits.

Typical Applications – Where the A10VNO Excels

Its cost‑effectiveness makes it a popular replacement for fixed pumps:

• Tractor fan drives – precise, on‑demand cooling for Tier 4/Stage V engines, saving fuel and lowering noise.

• Agricultural sprayers – agitation and transfer duties – low pressure, high volume.

• Industrial sweepers – powers the main blower fan, requiring variable torque at constant speed.

• Harvesters – straw chopper drives and grain augers.

Maintenance & Troubleshooting Tips

Routine operation requires no user adjustments if kept within specs. When problems occur:

Common fault: pump fails to stroke (no flow).
Check first: pilot pressure and control valve – don’t immediately condemn the pump. Always reduce operating data during diagnosis and note any recent system changes.

Critical care:

• No high‑pressure washing near shaft seals or electrical parts – water ingress causes early failure and voids warranty.

• Fluid cleanliness – maintain ISO 18/13/16 or better; suction starvation is a leading cause of damage.