Bosch Rexroth R992000086 A4VG90 Axial Piston Pump Assembly

The Bosch Rexroth A4VG90 series is a variable displacement axial piston pump of swashplate design for hydrostatic closed-circuit transmissions. It is engineered for high-performance hydraulic systems in demanding mobile and industrial applications. The nominal displacement is 90 cm³ per revolution with a nominal pressure rating of 400 bar and a maximum peak pressure of 450 bar. This unit supports various control devices including hydraulic proportional (DA), electro-hydraulic (EP), and hydraulic pilot-pressure related (HD) controls, enabling precise flow management. The pump features a robust cast iron housing, through-drive capability for tandem configurations, and SAE mounting flanges. It serves as a primary drive pump in wheel loaders, excavators, concrete pumps, dump trucks, and pavers. Key OEM applications include Liebherr L586 wheel loaders and Komatsu WA250-5/WA270-5 wheel loaders. The pump requires a charge pump for circuit replenishment and cooling.