Rex B wrote in :

That's a great technique I've used many times, but it doesn't work for
needle bearings, unless they have an inner race (rare) and are sealed.
The grease just comes right out (in your face) between the rollers.

Packing with grease will work on needle bearings, not in one shot, but it
does work.

Find the closest fitting shaft, biggest hammer you can comfortably swing,
and thickest grease you have. Use a good cloth shop towel around the hand
holding the shaft, as the grease will shoot out at very dangerous
velocity, you dont want to get your eyes or anything tender near there.
It may take a dozen or more times of repacking the grease just for one
hit, but it will come out eventually.

One possibilible variation might be to turn a punch to the correct
diameter to fit the ID. Then relieve the diameter from the business
end to double the thickness of the target bearing. Fit a sleeve of
some sort of plastic or silicone that can conform to the needle
bearings enough to
seal it.
For the larger bearings, you might even be able to use a tube with
an
oversleeve to seal the OD to the needle bearing. Fit a plunger to the
ID and use that to pump the grease.
Beyond that, the only thing I know of is a slidehammer.


The more of the hole you can seal the better, but as long as you cant
bottom out the driver too easily, it will transfer energy into the
bearing.

Don't know if it's useful to this discussion, but I have seen
equipment with dowels and sealed bearings in blind holes, that have a
drilled port to the backside of the recess. That port is threaded for
a grease zerk for extraction purposes.


Same principle, but you really need a fresh zerk fitting and coupler on
the grease gun or the leakage will kill you. Most of the
bearings/bushings I drive out with this method are larger then my grease
gun piston.

Jeff