1. Common Hydraulic Pump Failures

• Pressure Loss: Caused by worn pistons, scratched valve plates, or faulty control valves

• Slow or Jerky Operation: Often due to damaged shaft or cylinder block and excessive clearances

• Overheating: Blocked oil passages or poor return flow leading to heat buildup

• Abnormal Noise: Usually caused by damaged gears, bearings, or improper assembly

• Reduced Rotary Power: Caused by faulty seals in control pistons or decreased pump displacement

2. Recommended Replacement Parts

For SANY rotary drilling rigs, Rexroth A8VO160 hydraulic pump parts are ideal:

• Piston Group

• Cylinder Block

• Valve Plate (L/R)

• Drive Shaft

• Center Pin

• Control Piston and Spring

All parts should be made of high-precision, wear-resistant alloys to ensure longevity and stability under high pressure.

3. Replacement & Maintenance Tips

• Replacement Interval: Every 2000 working hours or upon abnormal performance

• Suggested Replacements: Always replace seals and hydraulic oil filters together with core parts

• Post-Replacement Operation: Perform a 10-minute no-load run to verify pressure and stability

4. Conclusion

Timely maintenance and the use of precision replacement parts are key to maintaining the drilling efficiency and reliability of SANY rotary rigs.