Key Technical Parameters – What Really Counts

• Displacement: variable, up to 180 cm³/rev (0–100% control range)

• Pressure: 350 bar continuous, 400 bar peak

• Speed: 400–1800 rpm (inlet‑condition dependent)

• Flow direction: standard unidirectional, reversible optional

• Mounting: SAE flanges (2‑ or 4‑bolt)

• Ports: metric or inch threads, compatible with SAE split‑flange fittings

Control Options – Matching the Pump to the Job

The pump’s real flexibility lies in its interchangeable regulators. Choose the one that fits your application:

• DR – Pressure control: holds outlet pressure steady regardless of flow – ideal for presses and moulding machines.

• DFR – Load sensing (LS): adjusts displacement to keep a fixed pressure margin (usually 14–20 bar) across a valve, delivering only the flow the actuator demands. This cuts energy waste and is common in excavators and drill rigs.

• LR – Torque limiting (power control): caps input torque to safeguard the prime mover – available as constant‑power (LR) or electronic droop versions.

Common Failure Modes – Lessons from the Field

The A4VSO180 is tough, but these issues crop up:

1. Inlet starvation – the 180 cc unit needs a properly sized suction line (minimum 2 m head or 0.8 bar absolute at the port). Monitor with a vacuum gauge.

2. Contamination – keep oil to ISO 4406 18/15/12 (NAS 7). A clogged servo‑piston filter often signals trouble.

3. Case drain pressure – must stay below 2 bar absolute; otherwise the shaft seal will leak.

Quick diagnostic: brass particles in the drain filter indicate slipper pads lifting off the swashplate – usually caused by pressure spikes or thin oil.

Real‑World Applications

• 150‑ton press brake – two A4VSO180 units in parallel with DFR (load‑sensing) at 180 bar. Result: rapid approach, accurate bending, and under 5% energy loss versus fixed gear pumps.

• 10‑ton deck crane – single pump with EP electronic control, driven by a 90 kW motor. Open circuit simplifies adding a bypass filter and cooler.

• 500‑ton scrap shear – uses LR (torque‑limiting) mode during cutting peaks to prevent a 250 HP diesel from stalling.

Installation & Service Tips

• Mounting – SAE J744 flanges; tighten bolts evenly to avoid housing distortion.

• Coupling – use a flexible type with max 2–3° angular misalignment; ensure no axial load on the shaft.

• Startup – fill the case drain before first run; idle for 30 seconds with no load.

• Oil – HVLP 46 or 68 (ISO VG 46/68); maintain viscosity between 16–100 mm²/s at operating temperature.