Quote:
Originally Posted by vilanar
Wheel bearing grease that is used on semis will last the lifetime.
We can easily drive 500 000 miles with one set of bearings. ( some of them even have 600 000 mile warranty in them)
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Need to speak about semis, having lived the life for twenty years. They -(the steer and trailer hubs)- do not run on 'axle grease' rather they use lube oil as we refer to as gear oil. The weights range from 75W to 85w-140 depending on climate.
They need service at regular specified intervals of PM. The industry and the DOT encourage the drivers to daily monitor hub levels. Drive axle hubs, however, receive lube from the differential, checked by the tech during PMs.
Lighter duty steer axle with grease pack, in highway use, need change service at 100,000. Heavy duty (18 whl. / 'gear oil') also need service at 100,000.
Synthetic lube oil can be run in highway use ,long haul, 250,000 for steer and trailer hubs. Differentials, which supply drive hubs, can run synthetic oil up to 500,000.
