Introduction

The Rexroth A4VSO axial piston pump is widely used in excavators and industrial hydraulic systems. While reliable, long-term heavy-duty operation can lead to failures such as unstable pressure, noise, leakage, or overheating. This article summarizes the most common problems and spare parts solutions.

Common Failures and Causes

1. Noise and Vibration – caused by worn piston shoes or cylinder block.

2. Pressure Instability – valve plate wear or control piston leakage.

3. Internal Leakage – damaged seals or scoring in the cylinder block.

4. Overheating – excessive friction, oil contamination, or clogged filters.

5. Shaft Seal Failure – due to shaft wear or improper case drain routing.

Troubleshooting Table

Recommended Spare Parts

Cylinder block, valve plate, piston shoe set, retainer plate, drive shaft, seal kit.

Case Example

A mining company extended overhaul intervals from six to twelve months after upgrading to Halies spare parts for their A4VSO71 pump.

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