On Tue, 15 Sep 2009 18:25:20 GMT, "Lew Hodgett"
wrote:

wrote:

are you saying that anytime you take an electric motor apart you
will damage
the bearings???

It is almost impossible to take a motor apart without transferring a
static load from inner race across a couple of balls to the outer race
when taking a motor apart.

The result is the balls brinell the races or leave pit marks in the
races.

Standard practice is to replace the bearings and properly use an arbor
press to reassemble the motor avoiding the load transfer across the
bearings during re assembly.

Lew


Depends a lot on the motor though. Some can be taken apart by hand
with virtually no prying or hammering, and assembled just as easily.
In that case bearing damage would be unlikely - but When you have a
motor apart a couple bucks worth of bearings is cheap insurance.

Usually takes more work to get AT the motor than to repair it.