M939 fromt inner hub seal questions

[jdknech]

hi, well after a catastrophic front bearing failure, (if involved a LARGE tow truck, and a even larger bill ) i am trying to reassemble the front hub/spindle/bearing Assy. now comes my question-

the front inner seal I got from memphis equipment had a "wiper ring" that came with it, what is the purpose of this ring? I can not find it in the TM, or the parts TM.. I do know it is the same seal thats used on the rear, is this wiper ring used on the rear, but not on the front?

Also, the seal is marked on one side "outside" but according to the TM picture, it is installed with that side facing the diff (center of truck) the TM pic looks like the correct way to assemble it (as it should, it is the TM lol) just wondered why the actual seal would be marked opposite of the TM?

everything was a fine power when it was "removed" from the truck, so I don't really have much to go off of... and i can't jack up the other side as a reference, until this side is on the ground (on a slight sideways hill, and couldn't be moved because the wheel was not attached when the tow-truck dropped it off)

thanks foe the help guys- Joshua

 

[jdknech]

and I misspelled front in the title

 

[poorman4x4]

The rear wiper was "designed" to keep gear oil out of the bearings, hence the front has axleshaft seals. inner hub seals go on one way its not hard to figure out by looking at it one side has 6" id the other doesnt

 

[poorman4x4]

the only rubber on the inner hub seal is the part that rides on the seal surface of the spindle