A4VSO71EO2/10RVPB13N00 A4VSO71EO2/10RPPB13N00 A4VSO71EO1/10R-VPB25N00 Rexroth Axial Piston Pump

A1: Noise type directly indicates the root cause -- use this classification guide:

A2: Overheating accelerates seal aging and oil degradation -- address these top causes:

1. Oil Viscosity Mismatch:
   • If viscosity <10 mm²/s (overheated oil), drain and refill with VG 68 oil (for high-temperature environments).
   • If viscosity >1000 mm²/s (cold start), preheat the tank to 20°C with an electric heater.
2. Case Drain Line Restriction:
   • Inspect the DN20 drain hose for kinks or blockages (common in mobile machinery with tight routing). Replace with smooth-bore hose if inner diameter is reduced by ≥30%.
3. Overload Operation:
   • Monitor power output -- if operating at >45 kW for extended periods, reduce load or upgrade to A4VSO125 (larger displacement).
   • Ensure the LR2 power limit is set correctly (matches motor rated power) to avoid overloading.
4. Internal Friction Increase:
   • Check piston shoe wear: If the contact surface with the swashplate is uneven, replace the piston shoes (R900912345).
   • Lubricate the swashplate with high-temperature grease (Rexroth LT 31) during reassembly.