Bosch Rexroth A10VO 52 and 53 series A10VO45 variable hydraulic pump

The A10VO45 is a variable-displacement axial piston pump with a swashplate design, built for open-circuit hydraulic systems. "45" in the model designation refers to its geometric displacement — roughly 45 cm³ per revolution at maximum swashplate angle — placing it in the mid-displacement range of the broader A10VO/A10VSO product line.

Rexroth designs this pump to convert mechanical input (from a diesel engine, electric motor, or PTO) into hydraulic flow that can be continuously adjusted to match load demand, rather than running at a fixed output regardless of the system's actual needs. That variability is the whole point: it's what separates it from a fixed-displacement gear or vane pump.

Where the "52" and "53" Series Come In

Rexroth updates its pump series periodically to refine internal tolerances, control valve options, mounting interfaces, and efficiency. The 52 and 53 series are both mature, well-proven generations of the A10VO line:

Series 52 — an established generation with a broad base of control options (DR, DFR, DFLR, EO-LR, etc.) and widespread OEM adoption across construction and agricultural equipment.

Series 53 — a refined successor with tightened manufacturing tolerances and updated control electronics/valve options, generally treated as backward-compatible in mounting footprint with Series 52, though control interfaces and part numbers are not always interchangeable.

For a buyer, the practical takeaway is this: series number matters for parts compatibility. Always match the replacement or rebuild kit to the exact series stamped on the nameplate, not just the "A10VO45" designation.

Core Design and Working Principle

Swashplate Axial Piston Architecture

Inside the A10VO45, a cylinder barrel houses a set of pistons arranged parallel to the drive shaft. As the barrel rotates, the pistons ride against an adjustable swashplate. Tilting that swashplate changes the piston stroke length — and therefore the volume of oil displaced per revolution — without changing the pump's rotational speed.

This is the mechanical basis for "variable displacement": the operator or system controller doesn't need to slow the engine down to reduce flow. The pump adjusts itself.

Control Options

The A10VO45 is available with several control types, and choosing the right one is arguably more important than choosing the pump itself:

DR (pressure control) — limits maximum system pressure by reducing displacement as pressure approaches the setpoint.

DFR (pressure and flow control) — combines pressure limiting with a load-sensing-style flow response.

DFLR (load-sensing control) — matches pump output to actual downstream demand, improving efficiency in multi-function machines like excavators.

EO-LR / proportional electric controls — allow displacement to be commanded electronically, useful in machines with electrohydraulic control architecture.

Common Applications

Mobile Construction Equipment

Excavators, backhoe loaders, and skid steers use the A10VO45 to drive boom, arm, and bucket circuits, often paired in tandem or triple-pump arrangements with larger A10VO or A11VO units for travel and swing functions.

Agricultural Machinery

Combines, self-propelled sprayers, and forage harvesters use variable pumps like the A10VO45 for auxiliary hydraulic functions — header drives, fan drives, and steering — where load varies significantly through a work cycle.

Industrial and Stationary Systems

Injection molding machines, presses, and test rigs use it where energy efficiency matters and load profiles fluctuate, since the pump only draws power proportional to actual demand rather than running full displacement constantly.

For more information on the A10VO45 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: How do I know if my A10VO45 is wearing out internally?

A1: Rising case drain flow at a consistent test pressure and speed is usually the first measurable indicator, often appearing before performance symptoms like sluggish cylinder response or reduced max pressure capability.

Q2: What's the typical service life of an A10VO45?

A2: It varies enormously based on fluid cleanliness, inlet conditions, and duty cycle, so Rexroth does not publish a fixed service-life number. Pumps kept within recommended contamination and inlet pressure limits routinely run for many thousands of operating hours; pumps run with poor fluid conditions or inlet starvation can fail in a fraction of that time.

Q3: How to purchase an A10VO45 hydraulic pump?

A3: You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.

Q4: What is the price and delivery time of the A10VO45 hydraulic pump?

A4: The specific price and delivery time will be provided based on the specific model you provide.