Caterpillar 5P-9757 Seal For Caterpillar 5P-9757

CAT 5P-9757 is a genuine Caterpillar O-ring seal with an inner diameter of 18.77 mm, catalog number 5P-9757. This compact, standalone seal is designed for Cat equipment and replacements that specify a 18.77 mm ID O-ring, and it is listed in Caterpillar’s official CATCorp catalog as 5P-9757, confirming its identity as a Cat sealing component. Some third-party listings describe 5P9757 specifically as an O-ring seal used with governor piston assemblies, reflecting Caterpillar’s use of this size in hydraulic and mechanical interfaces that require a precise, leak-tight seal. As a Cat-brand part, it is intended to meet Caterpillar service specifications for sealing interfaces where an 18.77 mm ID O-ring is required, so when selecting a replacement verify the groove size and mating surface in the target Cat assembly to ensure proper fit and performance. The 18.77 mm inner diameter is a precise dimension that defines the seal's compatibility with the corresponding Cat groove and sealing surface, contributing to reliable operation in Cat hydraulic and engine interfaces.