Bearing Hub Cap Dislocation

[levittownnick]

I trail a relatively short distance (less than 10 miles) and often one of my Hub-Caps, always on the same wheel, comes off somewhere on the road. This is a tandem trailer and I have not been able to figure what the source of the problem is. I have replaced all 8 wheel bearings but it still happens. Can you give me a path to follow?
Thanks'
Nick

 

[dingbat]

It may sound strange, but the first thing to check to make is the cotter pin. It needs to be bent pretty tight to the bolt.

Seen many a cotter pin walk a wheel cap right off

 

[levittownnick]

Thanks'
I'll remove the new cap and check that.
Nick

 

[robert graham]

If the caps are the metal press-in types you can trying squeezing them in a vise to just slightly deform the outer circumference of the caps to provide a bit of "interference fit" when you tap them back in place....