Figure 14. - Wheel Seals Used With Grease Lubricated Wheel Bearings

Figure 17. - Unitized Scot or National Seal

TM-5-3820-256-24-5 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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WHEELS, RIMS AND TIRES COTTER KEY INSTALLATION The cotter key should be inserted with the long tang toward the end of the spindle. Bend long tang of cotter key over end of spindle. Clip remaining tang leaving just enough stock to bend down against side of nut. A correctly installed cotter key should have the appearance as shown in Figure 13. Figure 13. WHEEL SEALS To Insure satisfactory performanceof wheel seals, various precautions are necessary Whether the vehicle is equipped with grease or oil lubricated wheel bearings. Always replace wheel seals whenever the wheel and hub assembly is removed. Seals establish a wear patter after a period of usage and a reused seal may not be positioned back in its original location and leakage could result. Due to various types of wheel seals, it is important that the seal installation and position be checked at the time of disassembly to be assured that the new seals are properly installed. The types of wheel seals used are designed to be used with grease packed wheel bearings and oil lubricated wheel bearings. GREASE LUBRICATED WHEEL BEARING For the most part the seals used with grease lubricated wheel bearings will be of the lip type seal similar to that shown in Figure 14. The seal is installed with lip toward the inner wheel bearing. Scot unitized seals and Barrier unitized seals can also be used with grease lubricated wheel bearings. Figure 14. - Wheel Seals Used With Grease Lubricated Wheel Bearings OIL LUBRICATED WHEEL BEARING Different versions of oil lubricated wheel bearings will be found, and they are: Stemco Lip Type Seal With Wiper Ring The metal encased lip type seals shown in Figures 15 and 16 have a wiper ring or wear sleeve mounted on the axle or spindle. The wiper ring provides a smooth contact surface for the lip of the seal, which is also replaced when seals are replaced. The lip of a seal can wear a groove in the axle or spindle at that point where the lip makes contact. The oil lubricated seal shown in Figure 16 has an added feature called grit guard. The grit guard is a shielded extension on the wiper ring to prevent grit and road splash entering the seal. CTS-4148A Page 8

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