HMMWV M998 Hub Washer Wear

[happycamper]

After checking and properly torquing my hubs (35#, spin 5x, 5x, 25# and lock) I noticed after a 75 mile highway trip my rear right was slightly warm to the touch whereas my others were ambient temperature. Not hot by any means, just 5-10 degrees warmer than ambient. I disassembled and saw the keyed washer had groves worn on the outside edge of the that sits against the bearing.

Note that this hub nut was loose upon original inspection.
Thoughts on if this produced the heat? It's likely I didn't inspect it the first time in detail. Possible my torque wrench was incorrect? New washer is on the way, just want to know if I should check something else. I thought I read somewhere about plastic spacer shims sometimes installed, but I had none, maybe that was just the input seal.

 

[happycamper]

Update: my torque wrench was off calibration, so I probably ran it 75 miles over torqued.
Re-serviced and torqued to low end, and even only 18# when it still heats up.
After 22 miles left side hubs are 90-95 degrees. Right side hubs are 110-120 degrees (77 ambient). Running Lucas hub oil as well.
Bearings looked ok on inspections, but since I have no other ideas I will be swapping them out. Will update after that is complete. Any other ideas welcome.

 

[ken]

Was there damage to the bearing race?

 

[happycamper]

Both races felt fine. No visible damage to them or the bearings. The numbers still showed and all.

 

[tage]

yeah looks like over torque/tightening or really loose tolerances.
Good thing new bearings aren't that expensive, and preventive maintenance.

 

[happycamper]

Well I finally had the hubs rebuilt - looks like the bearings were slightly damaged. With the new spindle bearings and little adjustment on the drive bearing load they match the others in temperature. Note: Lucas Gear Oil is horribly difficult to wash out of hubs. I sweat that stuff must actually contain honey, I even had ants getting into a used bottle of it.