9X3977 - SEAL-RING 5K4500 Fits Caterpillar (Fits CAT)One New Aftermarket Replacement Backup Seal Ring Fits Caterpillar (Fits CAT) Wheel Loaders, Wheel Dozers, Underground Loaders, and Articulated Trucks This aftermarket replacement backup seal ring (9X3977) is used in hydraulic systems across a wide range of Fits Caterpillar (Fits CAT) construction equipment. Backup seal rings prevent O ring extrusion under high pressure hydraulic conditions, protecting the primary seal and extending the service life of
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