Abstract: An oil pump assembly having an adjustable gear hub assembly enclosed within a housing, which assembly includes a a spur gear for driving two independent gear pumps, a gear hub and an adjusting sleeve for adjusting the position of and securing the spur gear, elastically deformable oil seal rings fitting on either side of the gear hub for ensuring a tight fit of the components within the assembly and washers fitting outwardly of the oil seal rings each equipped with a "dog" for engaging the revolving spur gear. The oil pump assembly may also be provided with coverplates, one or both of which contain improved bypass channels that serve to meter the oil in the assembly so as to prevent oil leakage, while also maintaining a supply of oil in the pump assembly so as to prevent friction build up upon starting of the sewing machine.

Abstract: An oil pump assembly having an adjustable gear hub assembly enclosed within a housing, which assembly includes a spur gear for driving two independent gear pumps, a gear hub and an adjusting sleeve for adjusting the position of and securing the spur gear, elastically deformable oil seal rings fitting on either side of the gear hub for ensuring a tight fit of the components within the assembly and washers fitting outwardly of the oil seal rings each equipped with a "dog" for engaging the revolving spur gear. The oil pump assembly may also be provided with coverplates, one or both of which contain improved bypass channels that serve to meter the oil in the assembly so as to prevent oil leakage, while also maintaining a supply of oil in the pump assembly so as to prevent friction build up upon starting of the sewing machine.