Thanks Guy's great information, but I'm sometimes not as clear as I need to be so let me try once more! Not your fault, mine.
Had tire failure, Cheap tires, replaced! Tried to service bearing on trailer! Could not, they are sealed bearings from the factory, bearing races and seals come as (1) one unit, pressed into hub. When you remove the nylon lock nut from the axle (NOTE: Not the normal Key type nut with cotter pin) the entire hub, drum and everything comes off! Could not repack the bearings at all. Of the four wheels I pulled three had very little grease at all in them!
Using High Temp grease and two fingers I tried to pack the inner and outer bearings inside the hubs before replacing them back on the axle. Replaced the big flat washer and nylon nut tighten the nut and then backed off 1/4 turn.
Now here is the issue and my question!
These new nylon nuts have to be torqued down to between 180-200 ft-lbs. When the tire blew and I jacked the wheel up off the ground the entire hub moved 1/4 to 1/2" in all directions. The shop who replaced the tire advised me this new bearing is different and the hub nut needs to be torqued down. He checked all four wheel and the other three were also just as loose. Using an Impact gun he torqued the hub nuts down. When I returned home I used a torque wrench and set the torque on each hub at 180 ft-lbs. My hub temps with the temp gun shows between 95 to 120 degree's after about an hour on the Interstate. Is this about right or in the neighborhood?
With your past replies it seems I'm Ok with bearing temperatures! Has anyone else had any experience with these type of bearings?
My vehicle mechanic advised most all new cars and trucks are coming equipped with this type of bearing assemble, but mine was the first time he had seen them used in trailers!!!
Just wanted to see if anyone had any experience with them or knew of a way to maybe extend their life by forcing grease into them! Because what I have seen when I pulled mine, you may get three years out of them and then you will be going to a machine shop to get the old ones pressed out and new ones pressed in! If you are lucky and don't burn an axle up first!
Once again sorry for the confusion, I'm new to these forums and know all of your time is valuable. But be aware these things are out there!
Be safe and Thanks to all!