BTFD 3227 Posted Wednesday at 02:24 PM Share Posted Wednesday at 02:24 PM Getting ready to start rebuilding the rear hubs on our B85 and have a couple questions. First, are both bearings oil bath or is the outer oil bath and inner greased? Second, if both are oil bath, what’s the purpose of the inside seal between bearings and how does oil get back to the inner bearing? When I disassembled there appeared to be grease residue on both bearings. Sludge. Looking for guidance from the masters. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75577-1955-mack-b85f-rear-hub-bearings-and-seals/ Share on other sites More sharing options...
Solution h67st Posted Wednesday at 03:00 PM Solution Share Posted Wednesday at 03:00 PM The inner bearings were greased. When I built mine I omitted the center seal and made them both oil bath. Wheel seals today are much better than they were 70 years ago; I like the CR seals (made by SKF) where the rubber lip rotates in the steel housing. They're easy to install and hard to screw up. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75577-1955-mack-b85f-rear-hub-bearings-and-seals/#findComment-576502 Share on other sites More sharing options...
mechohaulic Posted 6 hours ago Share Posted 6 hours ago going to the CR seals, I've always taken some gear oil slowly on the inside of the new CR and rotated the seal by hand within it's self. self satisfaction knowing seal has lube. keep in mind this seal was a new item back in "dinosaur days==my time slot" . not needing stemco seal/ ring installer was a major break through in mechanical terms. earlier topics discussed the two seal wheel set up;;grease inner/ oil outer. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75577-1955-mack-b85f-rear-hub-bearings-and-seals/#findComment-576583 Share on other sites More sharing options...
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