Bosch Rexroth Hydraulic Pump Repair

Repairing a Bosch Rexroth hydraulic pump requires precision, as these pumps are high-performance components used in industrial, mobile, and aerospace applications. Below is a detailed repair guide, including troubleshooting, disassembly, and reassembly steps.

1. Common Bosch Rexroth Pump Types & Their Failures

A. Axial Piston Pumps (A10V, A4V, A7V, A11V Series)

Common Issues

Low pressure (worn pistonscylinder block)

Overheating (internal leakage, wrong oil viscosity) 

Noise (cavitation, bearing failure)

Control failure (sticking servo piston, clogged control valve)

B. Gear Pumps (AZPF, G2, G3 Series)

Common Issues

Low flow (worn gears, excessive clearance)

External leaks (shaft seal failure)

Whining noise (cavitation or air ingress)

C. Vane Pumps (PV7, PVV Series)

Common Issues

Pressure drop (worn vanes or cam ring)

Erratic operation (contaminated fluid)

Overheating (internal leakage)

2. Step-by-Step Repair Procedure

A. Safety & Preparation

- Depressurize the hydraulic system.

- Drain oil and clean the pump exterior.

- Gather tools Torque wrench, bearing puller, micrometer, seal kit.

B. Disassembly (Example A10V Axial Piston Pump)

Remove the pump from the system.

Inspect for external damage (cracks, leaks).

Disassemble in order

Remove shaft seal and bearing retainer.

Extract piston block and swashplate.

Check pistons, cylinder block, and valve plate for wear. 

Inspect control valve & servo piston (common failure points).

C. Component Inspection & Replacement

Part Check For Solution

Pistons & Barrel Scoring, wear Replace if beyond tolerance

Swashplate Pitting, scratches Polish or replace

Bearings Rough rotation Replace (SKFFAG recommended)

Seals & O-rings Cracks, hardness Replace with OEM kit

Control Valve Sticking, contamination Clean or replace

D. Reassembly & Testing

Follow torque specs (critical for Rexroth pumps).

Lubricate all parts with clean hydraulic oil.

Prime the pump before startup.

Test at low pressure first, then gradually increase.

3. Where to Find Repair Manuals & Parts

Official Sources

Bosch Rexroth Documentation Portal (Search by model number)

Rexroth eTutorials (Training & manuals)

Alternative Sources

HydraulicsPro (Repair guides)

ManualLib (Freepaid manuals)

AmazoneBay (For seal kits & spare parts)

4. Pro Tips for Longevity

-Use the correct hydraulic oil (ISO VG 46 is common).

- Install a contamination filter (Rexroth recommends 5µm filtration).

- Monitor pump noise & temperature (early signs of failure).

- Follow scheduled maintenance (seal replacement, oil changes).

Need Help with a Specific Pump Model

If you provide the exact model (e.g., A10VSO 45 DRG or AZPF-11-011), I can help

- Find the exact repair manual

- Troubleshoot your specific issue

- Source replacement parts

Let me know how I can assist further!

Elephant Fluid Power has dozens of standard parts and seal production workshops, We stock an extensive inventory of OEM & new aftermarket replacement piston pump parts for mobile and industrial applications. The piston pump spares include pumps from manufacturers such as Bosch, Vickers, Rexroth, Kawasaki, Hitachi, Denison, Linde, Komatsu, Sundstrand, Parker, Oilgear, and more.