The A4VSG series is built on three pillars:

1.Size-to-Power Ratio: It packs more displacement into a smaller envelope than most competitors.

2.Control Versatility: From simple hydraulic pilot controls to complex electronic damping.

3.Rugged Longevity: Sintered bronze swashplates and heavy-duty bearings designed for continuous shock loads.

The Swashplate Advantage

Unlike bent-axis pumps, the A4VSG uses a swashplate to tilt a rotating group. This allows for faster response times and simpler case drain configurations. For OEMs designing compact equipment, this is a major win.

Applications: Where You’ll Find the A4VSG

Because of its closed circuit nature, the A4VSG excels in traction and fan drive systems.

Mobile Machinery: Track drives on 20-ton excavators, propel systems on asphalt pavers (e.g., Vögele or Dynapac), and swing drives on telescopic handlers.

Agricultural Equipment: Variable speed combine harvester headers and self-propelled sprayer hydrostatic drives.

Industrial: Extruder drives and test bench dynamometers requiring precise speed holding.

Critical Control Options (The “DA” and “HD” Codes)

HD (Hydraulic, manual proportional): Best for basic hydrostatic transmissions. A lever physically strokes the swashplate.

EP (Electrical, proportional): For modern CAN-bus machines. A 0–10V or 4–20mA signal commands displacement. Ideal for torque limiting.

DA (Dynamic, speed-related): A brilliant design for hydrostatic fan drives. The pump’s displacement is directly proportional to input shaft speed. No sensors. No ECU.

DG (Direct hydraulic control): Used for high-response positioning in industrial presses.