Caterpillar 4K-9598 Retainer For 528 950 966C 966R 814 815 816

4K-9598 is a Caterpillar oil seal retainer engineered to secure the oil seal in differential and bevel gear assemblies inside select Cat machines. This genuine Cat component measures 101.6 mm in length, delivering a precise fit that preserves seal alignment and lubrication paths under heavy load and varied operating temperatures. It is designed as a factory-fit replacement compatible with a range of wheel loaders and related models, including 528, 950, 966C, 966R, 814, 815, and 816, making it a targeted part for rebuilds or routine maintenance on those machines. By maintaining correct seal seating, the 4K-9598 retainer helps prevent oil leaks, contamination, and excessive wear in the rear differential or bevel gear area, supporting long service life of the differential components. The part is cataloged under Cat's OEM program as retainers for differential gear assemblies and is intended for trained technicians performing proper installation with the correct seals and retainer orientation. Use this retainer when your service information specifies the 4K-9598 part number to ensure compatibility with your Cat equipment’s configuration.