Bosch Rexroth A8VO80 open-circuit axial piston hydraulic double pump

The A8VO80 is a variable-displacement, open-circuit double pump built by Bosch Rexroth AG for mobile hydraulic applications. "Double pump" doesn't mean two separate pumps bolted together — it means two axial piston rotating groups housed in a single casting, sharing one input shaft and one suction port, but each capable of delivering its own independently variable flow.

Key Technical Specifications of the A8VO80

Here's the data that actually matters when you're speccing a system or troubleshooting a rebuild.

Displacement, Flow, and Speed

Displacement (Vg max): 2 × 80 cm³ per revolution

Displacement (Vg min): 0 cm³ (full destroke)

Max input speed at Vg max: approximately 2,240 rpm

Max input speed at reduced displacement: up to approximately 2,750 rpm

Max flow per circuit at rated speed: roughly 179 L/min per rotary group (about 358 L/min combined at full swivel)

Pressure Ratings

Nominal pressure: 350 bar (5,100 psi)

Peak/maximum pressure: 400 bar (5,800 psi)

Auxiliary (charge) pump max pressure: 40 bar, with a pressure relief valve typically preset around 30 bar

Power and Torque

Max input power: approximately 209 kW

Max input torque: approximately 891 Nm

These figures explain why the A8VO80 shows up on machines in roughly the 200–280 hp class — it's matched to engines that can actually use that torque and power ceiling without the pump becoming the bottleneck.

Weight and Mass Moment of Inertia

Approximate mass: 90 kg (bare pump, without attachments)

Mass moment of inertia: around 0.022 kg·m²

A relatively low mass moment of inertia matters for engine response — it means the pump doesn't add much rotational lag when swivel angle or speed changes rapidly, which is important for machines doing fast implement cycles.

Control Options for the A8VO80

One of the reasons the A8VO series is so widely specified is the range of control heads available. Rexroth doesn't sell "one" A8VO80 — it sells a base pump plus a control module chosen to match the machine's hydraulic architecture.

Individual Power Control (LA0 / LA1)

This is the classic option for excavator and crane-type circuits. Each rotary group has its own power controller that limits displacement as pressure rises, so the pump never demands more input power than the engine can deliver. LA0 is a straightforward power limiter; LA1 adds the ability to override the power setting with an external pilot pressure signal — useful when a machine controller needs to dynamically shift power between circuits (e.g., prioritizing the boom over travel during a lift).

A hydraulic power-coupling variant (LA0K/LA1K) goes a step further: if one circuit is using less than half of its allotted power, the surplus can be transferred to the other circuit, up to the pump's total power ceiling — a genuine summation power control, without mechanically linking the two rotary groups.

Load Sensing (LS)

Load-sensing versions (LA0S/LA1S) adjust displacement to match actuator demand rather than a fixed power curve, by holding a constant pressure differential across a sensing orifice (typically set around 18 bar). This is common on machines using flow-sharing (LUDV) valve blocks, where matching pump output to actual demand improves fuel efficiency and reduces heat generation.

Electrical Proportional Control (EP2)

For fully electrohydraulic machine controls, the EP2 option adjusts displacement in direct proportion to a 24V solenoid's control current (roughly 200–600 mA across the control range). This is the option of choice when a machine's onboard controller — a Rexroth BODAS controller, for instance — needs full programmatic control over pump output.

Integrated Auxiliary Pump and Power Take-Off

Most A8VO80 configurations include an integrated auxiliary (charge) pump, typically around 8.6–9.7 cm³ effective displacement, which supplies pilot pressure for the control system and downstream pilot valves — eliminating the need for a separate charge pump on the machine. A pressure relief valve, and optionally a pressure-reducing valve, is built in to protect this circuit.

The pump also supports a power take-off (PTO) on the back end, allowing a third pump — a gear pump or another axial piston unit — to be mounted in-line and driven off the same input shaft. This is a common way to add a fan drive, cooling circuit, or auxiliary function without adding another engine-driven accessory point.

Real-World Applications

Example 1: Hydraulic Excavator Travel and Implement Circuits

A 20–25 ton excavator is the textbook use case. One rotary group of the A8VO80 feeds the boom, arm, and bucket circuit while the other drives the swing and travel motors. Individual power control (LA0KH1 or similar) keeps the engine from stalling under combined loads, while the hydraulic power coupling shifts unused capacity from swing to digging when the operator is trenching rather than slewing.

Example 2: Mobile Crane Winch and Outrigger Systems

On truck-mounted or crawler cranes, one circuit typically runs the main hoist winch (which needs precise, load-sensing flow control for smooth lifting and lowering) while the other handles slewing, outrigger extension, or boom telescoping. The LA1S load-sensing variant is a natural fit here, since winch operators need flow proportional to lever position, not raw pressure.

Example 3: Drilling Rig Rotary and Feed Circuits

Drill rigs often need one circuit dedicated to the rotary head (which sees highly variable torque as the bit encounters different strata) and a second, independent circuit for mast feed/retract. Keeping these decoupled — which the A8VO80's independent rotary groups allow — prevents a stalled rotary head from robbing feed pressure, or vice versa.

For more information on the A8VO80 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: Can the two rotary groups on an A8VO80 run at different pressures at the same time?

A1: Yes. That's the core advantage of the double-pump design — each rotary group has its own swivel angle and, depending on the control head, its own power controller, so the two circuits can operate at completely different flows and pressures simultaneously.

Q2: What's the typical service life factor that determines when an A8VO80 needs an overhaul?

A2: Contamination control and inlet (suction) conditions are the two biggest factors. Most premature failures trace back to fluid cleanliness below the ISO 4406 20/18/15 threshold, or insufficient suction pressure at high speed, both of which accelerate wear in the piston/cylinder-block rotary group and the swivel bearings.

Q3: How to purchase an A8VO80 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 A8VO80 hydraulic pump?

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