volvo loader L90 rexroth hydraulic pump repair
Repairing the Volvo L90 A10VSO hydraulic pump begins with fully disassembling the housing and removing the rotor, pistons, and rear plate. Rotor and main shaft surfaces are measured with 0.05 mm precision to detect wear or misalignment. Pistons and springs are inspected and replaced if cracked, worn, or broken. All seals and O-rings are replaced to prevent hydraulic leaks. Components are cleaned with specialized hydraulic solvent, dried, and prepared for reassembly.
Assembly starts with precise installation of the rotor in the housing and alignment of the rear plate. Shaft torque and preload are adjusted to achieve 40–50 MPa operating pressure. Flow rate and volumetric efficiency are measured on a test bench at 2200–2500 rpm. Common issues include excessive noise, reduced output pressure, and internal leakage, which are resolved by replacing worn parts and accurate shaft alignment.
