easy part first, yes you can test the tire perrsure with tire off. *also always test while tire is cold, when hot they read higer!
Tires off trailer you see the center of the hub, take the cap off,
you will see a cotter pin, remove it,
some have a little cage thing next some don't, remove if so.
then you unscrew the nut, there will be a washer then the bearing. just pull the hub off and it will come right out.
Not filp over there is a seal on there, take off, don't worry about breaking it cause you are going to replace any way!!
After thats out you will see rear bearing, it will drop right out.
Now clean all with some degreaser and inspect, are they still nice and sliver looking? Put on fingers and turn, do they make noise? *Are there any rust or pitting?
If all is good then its time to repack, I bought this and it saves time and does a great job!! You can get any auto store.
http://www.drivewerks.com/catalog/sh...AT265_pg52.htm
you will also have to go to boaters world or a trailer place near you to get a new seal for the rear, some auto stores carry them also Napa is good with boat parts.
So now you have all your stuff clean, you have all your new parts, and you have greased your bearings, start with the rear (bigger bearing) lay a nice bead of grease in on the race (wear the bearing rests) push bearing on, then set seal square and lay a 2 x 4 on it, hit with hammer till seated, Careful not to ruin it!!
Now grease the axle and put hub on,
add some more grease,
grease the race and set bearing,
put washer,
then nut,
get nut snug NOT TIGHT,
put tire on,
now wiggle the tire, do you feel wiggle?? if so, turn nut till tire is just tight and STOP!
If tire is tight then losen till its just loose, the idea is to get it tight with out any drag when you spin it, to tight you will drag and burn the bearings out, to lose you will wobble and ruin bearings and lose the tire.
After you get the nut were you need to, add that cage thing if you have and then the cotter pin.
At this point you can tap the old cover on, or put some bearing buddys on, they are caps with a grease fitting in the middle so you can add grease to them when needed. *I would go with the bearing buddys if it was me.
Now if you removed the bearings and found themm to be damaged then ther is a whole different instruction!!
But we will save that till you see what you got.