Caterpillar 9G5319 Duo-Cone Floating Seal Assembly

The Caterpillar 9G5319 Duo-Cone floating seal assembly is engineered for final drive and track motor applications across articulated trucks, wheel tractor-scrapers, track-type tractors, wheel loaders, and motor graders. The seal group consists of two identical forged steel seal rings (100Cr6/GCr15/E52100) mounted face-to-face in separate housings, centered by elastomeric elements (NBR, Silicone, or Viton) to maintain an oil-tight barrier during rotation under severe misalignment and contamination. Assembled outside diameter measures 297.95 mm with metric envelope dimensions of 292.86 x 268.45 x 295.6 x 296.98 mm. Metal ring hardness ranges 58-62 HRC. Designed for 5,000-8,000 hour service life in construction, mining, and earthmoving environments. Directly replaces Caterpillar OEM part numbers 9G-5319, 6T-8437, 9W-6689, 5M-1188, 9W-6688, and 5M-1177. NSN cross-reference 4320-01-184-7819.