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Code: Selecteer alles

Get the wheel off and the spacers out. If you've never had the bearings out, you need to
understand how the hub is setup. Starting from one side, there's a grease seal, a snap
ring, the bearing, a long aluminum spacer that runs from bearing to bearing, the other
bearing and the other seal. The spacer is usually tight and you need to move it a bit to
be able to drive the bearing out.
Remove the seals, which can get trashed in the process so have some spares around. You
can roll the seal lip over and get the springs out of the seal before removing them to
try and salvage them. Then remove the snap ring.
I have a 2' long 1/2" soft steel rod that I got at a farm supply store. I put that into
the hub far enough to contact the spacer just above the opposite side bearing. Then use
it like a crowbar to push the spacer away from the opposite side bearing enough to be
able to get the rod to contact the bearing. Then I whack the bearing with the rod and
hammer. The spacer should move easier after that but work your way around the bearing
that way until it's out. The spacer should drop right out. Flip the tire over and drive
the other bearing out.
Now take a sharp knife or tiny flat screwdriver and pop the seal off from the inside race
on both sides. Clean the bearing if it's really ugly and/or pack grease into it. The way
I pack grease in is to put a big glob in my palm and grab the bearing with my opposite
hand, index finger through the middle. Hold the bearing about 30 degrees from you flat
palm and you just kind of scrape a little grease at a time off the glob and down against
your palm. That forces the grease up into the bearing. You'll see it coming through from
the top after a few scrapes. Keep rotating the bearing until it's all greased. I use
BelRay waterproof grease, FWIW.
Put the seals back on after wiping any excess grease away. I leave as much grease in them
as they'll take. This is not a high speed bearing application so you can leave them
packed with no problem.
To drive them in, I start them with a hammer just tapping around the outer race until the
are close to flush with the hub. Then I use a large socket and work around the outside
edge to drive them home.
I know the common wisdom is that if you drive a bearing out by hammering on the inner
race, you have to replace the bearing. I've been doing this for a lot of years with never
a problem so I disagree with that theory.
If the bearing is rusty or feels gritty when you turn it, trash it. Bearings are pretty
cheap at the local bearing houses usually. For a quick lube in between the above full
service, you can pop the grease seals and the snap ring off, pop the seal up from the
outside of the bearing and force some more grease in.