Posted by MarkB_MI on August 30, 2023 at 06:13:28 from (174.211.36.120):
Our fifth-wheel camper has Dexter EZ-Lube hubs, just like nearly every other camper and utility trailer on the road. Over the past five years, I've dutifully greased the hubs every spring. This year, I didn't think the brakes were working as well as they should, so I decided to pull the hubs and inspect the bearings and brakes.
The left side hubs looked fine: There was no sign of grease leaking past the seals. I replaced the seals, put everything back together and adjusted the brakes. But when I pulled the right rear hub, this is what I found:
The brake drum was full of grease. It was a big project to get it all cleaned up. The brake shoes cleaned up OK so I re-used them. The right front hub showed a little grease leakage, but not enough to cause any problems.
I assumed the seal failed from improperly pre-loaded wheel bearings. But when I inspected the seal I couldn't find anything wrong with it; it looked exactly like the seals that had not leaked. The spindle looked fine as well. So I'm a bit baffled why one seal out of four leaked. Also, the brake drum and shoes showed no sign of wear compared to the other three hubs, so this problem has been going on since the camper was almost new. Something may have been done wrong at the factory, but I don't know what it would be.
Note that the seals are double-lipped; grease has to get by both lips to leak past the seal.
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