Frequent failures of excavator main pumps—such as unstable pressure, abnormal noise, sluggish system response, or starting difficulties—are becoming more common under long-term heavy-duty operation. The root causes often include:

1. Poor Fit from Non-Genuine Parts

Using substandard aftermarket components leads to mismatched tolerances in valve plates, pistons, and bearings, which accelerates wear and causes chain failures.

2. System Contamination

Failure to replace filters or the presence of metallic debris in the hydraulic oil can scratch sliding components inside the pump, shortening the lifespan of the system.

3. Seal Degradation

Low-quality sealing rings tend to deform under high temperature and pressure, leading to severe internal leakage and power loss.

4. The Solution: Use Genuine-Grade Parts

Opting for OEM or OEM-equivalent parts—such as Rexroth or Kawasaki replacements—ensures better sealing, precision, and system stability. This significantly reduces breakdown risks and unexpected downtimes.

5. Wide Compatibility & Harsh-Condition Durability

Genuine-grade parts for A8VO160, K3V/K5V/K7V series are widely compatible with CAT, Kobelco, Hyundai, and Doosan main pump systems, and proven in demanding environments.