Rexroth Hydraulic Pump Repair

Repairing a Rexroth hydraulic pump requires technical expertise, proper tools, and the correct service manual. Below is a general guide for troubleshooting and repairing common Rexroth hydraulic pumps (axial piston, gear, and vane types).

1. Common Rexroth Hydraulic Pump Failures & Symptoms

Symptom Possible Cause

Low or no pressure Worn pistonsvalves, clogged filters, internal leakage

Excessive noise Cavitation, air ingress, damaged bearings, misalignment

Overheating High viscosity oil, excessive load, internal leakage

Leakage (external) Damaged shaft seals, O-rings, or housing cracks

Erratic operation Contaminated fluid, sticking control valve, worn swashplate

2. General Repair Steps for Rexroth Pumps

A. Safety First

Depressurize the system.

Drain hydraulic oil.

Clean the pump exterior to prevent contamination.

B. Disassembly (Varies by pump type)

Remove the pump from the system.

Inspect for visible damage (scoring, cracks, worn seals).

Disassemble carefully (refer to the manual for torque specs and order). 

For axial piston pumps, check

Pistons & cylinder block

Swashplate & bearing

Control valve & servo piston

For gear pumps, inspect

Gear teeth wear

Side plates & bushings

For vane pumps, check 

Vanes & rotor slots

Cam ring wear

C. Component Inspection & Replacement

Replace worn seals (shaft seals, O-rings).

Check bearings for smooth rotation.

Measure clearances (e.g., piston-to-bore, gear backlash).

Polish or replace scored surfaces (if within tolerance).

D. Reassembly & Testing

Follow the manual for torque specs and assembly sequence.

Prime the pump before startup.

Test for pressure, noise, and leaks at low RPM first.

3. Where to Find Rexroth Repair Manuals

Official Source Bosch Rexroth Documentation (search by model).

Alternative Sources

HydraulicsPro

ManualLib

Tradebit (paid manuals)

4. Recommended Replacement Parts

Seal Kits (Rexroth OEM or quality aftermarket like Parker, NOK)

Bearings (SKF, FAG)

PistonsGearsVanes (if worn beyond tolerance)

Need a Specific Model Manual

If you provide the exact Rexroth pump model (e.g., A10VSO 45 DRG), I can help locate the correct repair guide!

Would you like troubleshooting steps for a specific issue (e.g., pump not building pressure) Let me know!

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.