On Saturday, March 22, 2014 10:51:53 AM UTC-4, s6 wrote:
Le jeudi 20 mars 2014 00:03:07 UTC-4, Paul Villinski a écrit*:
Bearings for the pre-1990 Cobra's are unsealed taper bearings. For the 13", 4-lug wheel, replacement bearings are available at auto parts stores like Autozone.

Large, inner bearing: Timken "Set 8" L45449 - L45410

Seal for this bearing: Timken 224015

Small, outer bearing: Timken "Set 1" LM11710 - LM11449

Wheel drums are available from Eastern Sailplanes for $125.

After recent misadventures with a disintegrating bearing en route to Florida I have added bearings and grease to the spares/tools in the trailer.

Hi
I have a 2002 cobra trailer. The owner manual says I have permanently seal bearing. Now I have no idea what this mean. I am totally incompetent in mechanical things. Does it mean I have nothing do maintain.
Regards
Gilles

Typically it means it's a "cartridge bearing" compared to a "taper roller bearing".
Easiest way to tell (without pulling it all apart) is to remove the dust cap on the center of the hub.
If there is a "castellated nut" and a lock device (like a cotter pin), then it's a pair of taper roller bearings.
These can be removed, cleaned, re-greased & reassembled (assuming they haven't dried out the grease and welded themselves together).

A cartridge bearing is "pre-assembled", can't really be opened/cleaned/greased and has no maintenance until it dies (usually late at night, middle of nowhere, while raining, etc.....).
Some will require a medium hydraulic press to remove the old bearing & install the new bearing.