WHEELS, RIMS AND TIRESIf the inner wheel bearing is smaller than the opening inthe seal, it is permissible to assemble the bearing on thespindle first, then install hub assembly with seal.However, do not leave excessive lubricant contact sealas it will erroneously appear as a leaking seal.Should it be necessary to remove the wheel assemblyfrom the spindle due to hang-ups, it is necessary torecheck the seal for proper installation. In some casesthe seal will be separated. The inner half must beremoved by hand from the spindle shoulder. Reinsertinner half in outer wheel seal by snapping together.Then reinstall seal assembly.Guardian Oil SealThe Guardian oil seal grit guard is installed in the samemanner as the wiper ring, previously described andshown in Figure 20.The seal is then positioned on the wiper ring assemblywith lip of seal toward the bearing cavity of the hub. Thehub assembly is then positioned over the axle tube orspindle and seal assembly. This assures that the seal isin place over the wiper ring, as shown in Figure 19.Do not install the Guardian seal in the hub first since theseal could be pushed into the hub deep enough so thatthe installation could result as shown in Figure 26, andthe seal effect would not be accomplished (arrows).Figure 26. - Improper Installation of Guardian Oil SealWHEEL BEARINGINSPECTIONInspect inner and outer wheel bearing cups, cones androller for wear or damage. If any following conditionsexist, the bearing must be replaced If:Large ends of rollers are worn flush to recess, or radii atlarge ends of rollers are worn sharp (Figure 27).Figure 27.There is a visible wear step, particularly at the large endof roller and roller track, or deep indentations, cracks orbreaks in bearing cup and/or cone surfaces (Figure 28).Figure 28.There are bright rubbing marks on the dark phosphatesurfaces of the bearing cage (Figure 29).Figure 29.CTS-4148APage 13
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