Quote Originally Posted by Altair View Post
Vibrating wheel hub puller.
As noted in a previous post, the vibrations were from the Pneumatic Impact Wrench being used to turn the tension screw on the puller. In this application, the hub assembly is able to twist in response to the wrench impacts. Any additional torque the impact might provide is lost by moving the entire spindle/hub/puller assembly.

The effect is similar to trying to drive a nail into a board that moves with every stoke. Most of the energy that should be driving the nail is used up moving the board instead. Just a fraction is used actually driving the nail.

A better way to remove a stuck hub, is to tension the puller with with just a normal wrench. In this situation you apply more torque than with the impact wrench. Then use a pneumatic HAMMER on the center screw of the puller to induce linear vibrations that will actually act in a manner to pull the hub from the shaft.

If you do much of this kind of work, you need a pneumatic hammer.