That’s the defining feature. Most machines that need two separate hydraulic functions — say, travel drive and slew (swing) drive on an excavator — historically needed either two separate pumps or a more complex, compromise-prone shared circuit. The A24VG solves that by combining dual rotary groups into one compact package, each with its own swashplate that can be adjusted to vary displacement independently.

Key Design Characteristics

Two independent flows from a single drive input, each proportional to speed and displacement

Infinitely variable displacement via swashplate angle adjustment

Smooth reversal through neutral, meaning flow direction changes without harsh transitions

Integrated pressure relief valves (typically four) on the high-pressure side, protecting both pump and motor from overload

Boost pressure functionality, with relief valves doing double duty as boost valves

This is a pump designed specifically for closed-loop hydrostatic transmissions — not general-purpose open-circuit fluid transfer.

Typical Applications

Excavators — separate circuits for travel drive and upper-structure slewing

Cranes — independent hoist, slew, and travel functions without cross-interference

Drilling rigs — simultaneous rotary and feed functions

Other multi-function construction and mining equipment where two hydrostatic circuits need to run off one prime mover

The practical benefit is efficiency and control precision. Because each circuit is independently variable, the operator gets smoother, more responsive control, and the engine doesn’t have to compromise between two competing hydraulic demands routed through a single variable unit.

Choosing the Right A24VG for Your Application

A few practical questions worth answering before specifying a size:

1. What are the independent flow demands of each circuit? Travel and slew drives rarely need identical displacement — that’s exactly why the asymmetric size combinations (like 110-85 or 125-110) exist.

2. What’s the realistic peak operating pressure, not just the theoretical maximum? Sizing a pump to run near its 500 bar ceiling constantly will cost you in service life and unplanned downtime.

3. Does the application benefit from on-board electronics? If engine downsizing, emissions reduction, or travel drive efficiency gains are priorities, the OBE variant deserves a serious look rather than defaulting to a purely mechanical control setup.

4. What fluid environment will the machine operate in? Standard mineral oil, environmentally acceptable fluid, or fire-resistant fluid — this decision affects seal compatibility and should be locked in before final pump selection.