DB58 DB58TIS Oil Pump for DOOSAN Excavator The oil pump overhaul kit contains essential components for engine repair and maintenance of Perkins 403D-15, 403D-15T, and 404D-22 engines. Kit Components Gaskets and Seals: Prevent oil leaks at pump housing, cover plate, and mounting surfaces Rotors or Gears: Primary pumping elements (inner/outer rotors or gear sets) that create flow and pressure Drive Shaft and Bushings: Ensures smooth transfer of rotational force from engine to