Rexroth A22VG045 series 10 and 11 variable double hydraulic pump

The A22VG045 is a variable displacement, double (tandem) axial piston pump with a swashplate design, engineered for open-circuit hydraulic systems. "Double" here means two pumping units are combined on one input shaft and housing — effectively two pumps in one package, each with its own displacement control, each capable of feeding a separate hydraulic circuit independently.

Because it's built for closed-loop and open-loop split-flow applications, the A22VG045 is a natural fit for machines where two functions — say, travel and implement work, or two independent actuator groups — need dedicated flow that doesn't rob pressure or speed from one another.

How the A22VG045 Works in a System

Displacement Control

The pump's output flow is a function of swashplate angle. At maximum angle, each pumping section delivers its full geometric displacement per revolution; as the angle reduces toward zero, flow drops proportionally, even while the input shaft keeps turning at constant speed. This is what lets a single diesel engine, running at a fairly steady RPM, supply wildly different flow rates to different circuits on demand.

Rexroth offers the A22VG045 with several control philosophies, and the right one depends on the application:

Pressure and flow (load-sensing) control — the pump adjusts displacement to match the exact flow and pressure demanded by the highest-priority actuator, minimizing throttling losses. Common on excavators and loaders.

Electric proportional control (EP) — a solenoid-driven control that lets the machine's electronic controller command displacement directly, useful in systems with a lot of electronic function integration.

Constant power/horsepower control — limits combined pump output so the prime mover's power ceiling is never exceeded, protecting the engine from stalling under high combined load.

Common Failure Points and Maintenance Notes

Field experience with axial piston pumps of this class points to a fairly consistent short list of wear items:

Valve plate and cylinder block wear — from long-term operation with contaminated or degraded hydraulic fluid; the single biggest driver of premature pump failure across the industry.

Swashplate bearing wear — leads to increased noise and reduced control response over time.

Shaft seal leakage — often the first visible symptom owners notice, frequently traceable back to case drain pressure exceeding rated limits.

Control valve drift — on electrohydraulic control variants, solenoid or spool wear can cause displacement response to become sluggish or erratic.

Fluid cleanliness, correct case drain routing, and staying within the pump's rated pressure and speed envelope account for the majority of long-service-life outcomes reported by fleet maintenance teams.

For more information on the A22VG045 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

1) Limited maximum speed: At half corner power (e.g. at Vgmax and pnom/2)

2) Intermittent maximum speed:

  -At high idle speed

  -At overspeed: △p=1000 to 2200 psi (70 to 150 bar) and Vg max

  -At reversing peaks: △p<4350 psi (300 bar) and t<5 sec.

3) Without boost pump

4) The area of validity lies between the minimum required and maximum permissible speed. It applies for external stimuli (e.g. engine 2 to 8 times rotary frequency, cardan shaft twice the rotary frequency). The limit value applies for a single pump only. The load capacity of the connection parts must be considered.

Selection Table

Q1: What does "double" mean in A22VG045 double pump?

A1: It means two independent variable-displacement pumping sections are combined into a single housing on one input shaft, allowing one prime mover to power two separate hydraulic circuits with independent flow control.

Q2: What machines commonly use the A22VG045?

A2: Mid-size mobile equipment with two independent hydraulic circuits — wheel loaders, excavators, crawler cranes, concrete pumps, and certain agricultural and forestry machines — are the most typical applications.

Q3:How to purchase an A22VG045 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 A22VG045 hydraulic pump?

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