Figure 18. - Unitized Barrier Seal

Figure 17. - Unitized Scot or National Seal

Figure 20. - Installing Wiper Ring on Axle Shoulder

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
Page Navigation
598

WHEELS, RIMS AND TIRES Figure 18. - Unitized Barrier Seal Guardian Oil Seal The rubber encased lip type seal with wiper ring shown in Figure 19 is known as the Guardian oil seal. It has the grit guard feature similar to the seal shown in Figure 16, with the advantage of a direct contact between the seal and wiper ring to further guard against entrance of foreign matter. The wiper ring provides a smooth contact for the lip of the seal. The lip of the seal retains the oil in the bearing cavity. The rubber encasement has grooves around its circumference which retains the seal in place in the hub. Pay special attention to the installation of this seal found elsewhere in this section. REMOVE The wheel seals are removed using a brass drift and hammer. Position the drift through the outer opening of hub and against bearing. Tap bearing and seal out through the brake drum side of hub. Take care so that seal bore is not damaged. The wiper or wear ring used with oil lubricated wheel bearing is removed by using a ball peen hammer and tapping on the ring to fatigue it. Do not use a chisel to cut ring since it could damage the machined surface on the axle. Figure 19. - Guardian Seal CLEAN AND INSPECTION 1. Thoroughly clean all parts: axle tube or spindle, bearings, nuts and inside of wheel hub. 2. All burrs from inside back edge of hub must be removed. Hub must be smooth and free from burrs which will scratch the outside diameter of seal. 3. Remove burrs from axle tube or spindle shoulder. Shoulder must be smooth. 4. Inspect for porous or cracked hub which could allow oil leakage. This is important where leakage has been encountered. 5. Replace all parts as warranted. More information pertaining to lubricant leakage causes and corrections will be found in the Wheel Seal Leakage Chart in this section. INSTALL Wheel seal Installing tools are no longer available through Serv-Equip program. However, special seal and wiper ring installation tools are available through Truck Parts Marketing program. CTS-4148A Page 10

Privacy Statement
Press Release
Contact