TRACK GP 2428994 - Caterpillar

Personal injury or death can result from fumes, gases and ultraviolet rays from the weld arc.Welding can cause fumes, burn skin and produce ultraviolet rays.Keep your head out of the fumes. Use ventilation, exhaust at the arc, or both, to keep fumes and gases from your breathing area. Wear eye, ear and body protection before working.Protect yourself and others; read and understand this warning. Fumes and gases can be dangerous to your health. Ultraviolet rays from the weld arc can injure eyes and burn skin. Electric shock can cause death.Read and understand the manufacturer's instructions and your employer's safety practices. Do not touch live electrical parts.
The separately serviced ring seal and the expander ring must be assembled correctly into off-highway truck wheel and brake assemblies. The seal and the expander ring must be installed correctly in order to prevent brake cooling oil leakage into the differential.
Table 1
Rear Wheel and Brake Assembly Seals    
Truck Model     Former Seal Assembly     New Seal Ring     New Seal Ring    
768B
768C
769
769B
769C
769D
771C
771D     2D-6533
9X-7306     9X-7305     123-7264    
772
772B
772D
773
773B
773C
773D
775C
775D     9X-7309     9X-7307     123-2941    
776
776B
776C
776D
777
777B
777C
777D     2D-6507
9X-7309     9X-7307     123-2941    
784B
785
785B
789
789B     2D-6507
9X-7309
4D-0449
9X-7312     9X-7307
9X-7310     123-2941
123-7270    
793
793B
793C     9X-7312
9X-7315     9X-7310
9X-7314     123-7270
123-7270    
Because the cross section size of the expander ring is the same size as the rear brake hub seal groove, the expander ring may be installed incorrectly.
Illustration 1 g01788137
View of the seal assembly that is installed incorrectly (A) Brake hub (B) Seal (C) Seal Ring The seals may be installed into the rear wheel and the brake assemblies incorrectly. Refer to Illustration 1 in order to view the incorrect installation procedure. The following procedure will ensure that a reliable seal is retained between the rear hub and the retainer.
Illustration 2 g01791075
View of the seal assembly that is installed correctly (A) Brake hub (B) Seal (C) Seal Ring (D) Yellow mark
Install seal ring (C) to brake hub (A). View Illustration 2 in order to view the installation of seal ring (C). In order to ensure that seal ring (C) is correctly installed, make sure that yellow mark (D) is facing outward. This orientation is required in order to achieve the necessary seal face load after seal (B) is installed.
Assemble seal (B) to seal ring (C). Refer to Illustration 2 in order to view the assembly of seal (B) to seal ring (C) .