Metaluna

I have a hub with Enduro 6902 LLB bearings in it that I would like to flush and repack (a couple of them are starting to feel dry, bordering on gritty). However when I pop the seal off of the drive side cartridge, a second ring of plastic, which I believe to be the back side of the bearing retainer, is in the way. Is there any way to get grease into this thing without pulling the whole cartridge? I think that would destroy it anyway as you need a blind puller which pulls on the inner race. I can't get at the other seal obviously as it's inside the hub shell.

I grabbed this exploded view from the Enduro site. I believe this is probably how my bearings are constructed. The retainer is even the same translucent brown color.

HillRider

Can you get to the outer race from the other side of the hub working through the axle hole? A brass or aluminum drift could be used to tap around the outer race (tapping against the edge of the inner seal) from the inside and push the bearing out without impacting the inner race.

wschruba

It looks like you have an angular contact bearing; regular cartridges have a spacer that is two part, assembled from each side.

That said, you would service them the same way--flush with a solvent, allow it to dry completely, then lay a bead of grease over the ball bearings/retainer. When you (carefully and evenly) press the seal back on, it will force the grease into the bearing.

Metaluna

I think they're regular radial bearings (Enduro part number 61902 LLB). The angular bearings look like they have 71xxx part numbers.

https://endurobearings.com/wp-content...Full-.xlsx.pdf

In any event, if it's only a spacer it's sure stuck in there somehow. I got a fine gauge (1/1000" tip) steel dental pick all the way underneath it and could barely budge it even when pulling straight up (the pick was starting to bend). I'll try flushing it with some spray degreaser and give your idea a try. I have a grease gun with a needle tip so maybe I can lift the spacer/retainer a bit and try to squirt some underneath as well. If that doesn't work I'll try to tap it out with a brass drift. I sure hope the other three bearings were pressed in the other way around!

wschruba

Don't do that! The spacers are only meant to be installed once (indeed, you'll destroy the metal ones). It is best to work around the spacer...A needle tip would be sufficient for all but the tightest clearance cartridge. You can buy syringes with 20 gauge needles from farm supply stores--perfect for what you want to do.

dsbrantjr

New bearings are 8 bucks at Art's Cyclery; ABI Enduro 61902 15x28x7mm Bearing ABEC 5 (HED Rear)