This catalog consists of two parts and contains detailed specifications of assembly units and parts of three-axle trucks ZIL-131, ZIL-131A and ZIL-131V truck tractor, grouped according to the structural and functional characteristics .. Each group and subgroup is accompanied by illustrations of assembly units and individual parts arranged in the order of their constructive assembly. The catalog includes all assembly units, as well as parts of ZIL-131, ZIL-131A and ZIL-131V truck tractor; the exceptions are integral (welded) and assembly units, which are shown in the assembly . The range of parts placed in the catalog is much wider than the range of parts to be supplied as spare parts. Aggregates, assembly units and parts, whose numbers are printed in the catalog in bold, make up the nomenclature necessary for the production of repairs (current, medium, capital) and recommended for centralized delivery from the USSR. The catalog is a service manual for organizations engaged in the operation and repair of cars in the calculation and preparation of applications for spare parts . Catalogue based on current technical documentation as of 1 January 1977.