Caterpillar 6J-7167 Buffer Seal

CAT 6J-7167 Buffer Seal is Caterpillar’s official replacement seal, cataloged under 6J-7167, and listed as a Buffer Seal for Cat hydraulic cylinder assemblies. It’s available in a family of variants identified by codes 8, 8A, 8D, 8S, 8U, 9, 9C, 9D, 9S, 9U, and D10, allowing compatibility with multiple cylinder bore/rod configurations. This single-component seal is used in Caterpillar hydraulic systems that specify a 6J-7167 buffer seal, and is shown in Cat parts catalogs and aftermarket listings as the direct 6J-7167 part. When replacing, match the exact variant code to the cylinder specification to ensure proper fit and function. The part is commonly encountered in maintenance and repair of Cat heavy equipment and attachments that utilize hydraulic cylinders requiring a buffer seal.