Figure 17. - Unitized Scot or National Seal

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

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 Figure 15. - Oil Lubricated Wheel Seal With Wiper Ring Figure 16. - Oil Lubricated Wheel Seal and Wiper Ring With Grit Guard Unitized Scot or National Seals Unitized seals (Figure 17) in most installations do not require axle wiper rings and minimize wear on the axle spindle as follows. The outer shell of the seal being pressure fit in the wheel hub rotates with the wheel around the sealing element which is pressure fit on the axle spindle. With the unitized seal when replacement is made, the worn surface created by the sealing lip is also replaced by virtue of a new seal. Figure 17. - Unitized Scot or National Seal Barrier Unitized Seal The rubber encased seal shown in Figure 18 Is a barrier type seal. The seal effect is between the lips and encased metal ring. This type of seal is installed by hand and should not normally have any lubricant or sealant added to the inner or outer surfaces when installed. New seals have a lubricant applied to the mounting surfaces to aid in the installation. Do not apply grease to these surfaces. If grease should be applied to the outer surface of seal, the seal could slip in the hub or on spindle or axle tube. CTS-4148A Page 9

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