Random questions, replace all wheel seals or just the one that blew?

Sounds more like you're describing a hub gasket than a wheel seal.

 

This. If you are seeing oil on the outside, it's almost definitely not a wheel seal. Which is good for you. Cheaper and easier.....by alot.

 

How old is the trailer? Brakes? Are you planning on keeping it?

If you are doing wheel seals, and keeping an older trailer I would probably look at doing races/bearings, s cams, bushings, air cans and slacks, especially if you had a good year and are looking to kick off a little cash to help with Uncle Sam come April. But if you can wait until you need brakes it would be nice to do it all one shot

 

Is it leaking on the outside wheel, where you can see it standing next to the trailer? If so, it's just the hub/axle gasket. Literally five bucks and five minutes.

If it's the wheel seal, it's on the inner dual, and your brakes will be covered in sludge. Much more of a pain in the butt.

 

Oh yeah, that's easy.

Get a new gasket.
Get an empty milk jug, oil jug, whatever.
Cut out one side of the jug to make a drain pan.
Lay it on the wheel under the hub.
Remove the hub cover.
Clean surfaces, and replace cover with new gasket.
Refill with lube.
Put used drain pan on the back of an unsuspecting flatbedder's trailer.
Go on about your day.

 

That's just the hubcap. Much easier and inexpensive to fix and do it ASAP.

 

Check the Bolts on the other Wheels.. Sometimes they will loosen up a little...

 

R

Replace the bad wheel seal, don't replace wheel seals that are not leaking. Batteries are different, if one is bad replace them all.