Miter Saw Repair – Replacing the Armature Bearing (Makita Part # 211097-6)
Miter Saw Repair – Replacing the Armature Bearing (Makita Part # 211097-6)


Power tools use many ball bearings to allow
various components to rotate. Over time, a ball bearing will wear and begin
to fail. A bearing that is failing will usually give
warning, often with a squeaking or squealing sound. Replacing a ball bearing is a repair that
you can do yourself and I’m going to show you how. Hi. I’m Mark Sodja. Do it yourself repairs like these are easier
than you might think. From lawn machines to cordless drills, kitchen
mixers, outdoor grills, our how-to videos walk you through each repair from start to
finish. Doing it yourself means never having to do
it alone. Lets get started. I’ll begin by removing the front half of the
handle assembly. Next I’ll remove the motor brushes. Now remove the four screws that secure the
motor housing. Now I can remove the armature. Now I can remove the bearing. I’ll use a bearing separator to do this. Place the separator over the bearing and tighten
it up. Now place the separator over the jaws on my
vice. Now use a socket that has a diameter just
slightly smaller than the inner race. I’ll use the socket to tap the armature shaft
out of the bearing. Now I can install the new bearing, I place
it over the shaft and this time use a socket that has a diameter about the same as the
inner race to install it. Now I can reinstall the armature. To reassemble I want to make sure that the
bent portion of the shaft lock is pointing towards the upper guard. I’ll place the armature onto the shaft lock
and then place this assembly back into the housing. Now reinstall the motor housing. I slide it over the armature and align it
with the upper guard. I’ll secure it with the screws. Now reinstall the compression spring for the
shaft lock. I place it over the end of the shaft and then
into the housing. Now I reinstall the handle housing. Snap it into place and I’ll secure it with
the screws. Now reinstall the switch button. That’s all it takes to replace the ball bearing
on your power tool. Be sure to check back often for new videos
and expert advice. If you found this video helpful, give us a
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