Caterpillar 4N9679 Governor AS Air Compressor

The Caterpillar 4N9679 Governor AS-Air Compressor is a CAT part that serves as the control governor for CAT air‑end systems, helping regulate the output of an installed air compressor. Its part number is 4N9679, and CAT catalogs associate it with a broad set of engine families, including 3116, 3126, 3126B, 3126E, 3208, 3508, 3512, 3516, 5130, 5130B, 613B, 613C, 613C II, 621B, 621G, 623G, 627B, 627E, 627F, 627G, 631D, 631E, 631G, 633E II, 637D, 637E, 637G, 815, 815B, and 966C, 966F. This listing reflects CAT’s specification for a governor component used to manage the air‑end performance in these engine platforms. As a dedicated governor for industrial air compressors, 4N9679 is designed to be integrated into CAT-installed compressor systems to help maintain consistent pressure and reliable operation where CAT engines and their attached air systems are deployed. CAT documentation ties the part to a wide range of heavy‑duty applications, and technicians rely on the 4N9679 part number when ordering replacement governors to preserve proper pressure control in CAT air compressor installations.