DeWALT Grinder Repair – Replacing the Armature Bearing (DeWALT Part # N110359)
DeWALT Grinder Repair – Replacing the Armature Bearing (DeWALT Part # N110359)


Power tools use many 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 squeaking or a squealing sound. Replacing a ball bearing is a repair that
you can do yourself and I’m going to show 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 drills, our how-to videos walk you to each repair from start to finish. Doing it yourself means never having to do
it alone. Let’s get started. I’ll begin by removing the rear motor cover. Now, remove the motor brushes. First the wire lead, then I’ll pull the brush
spring out of the way and remove the brush. I’ll do the same thing on the other side. Now, I’ll separate the gear case from the motor. Pull the armature from the motor housing. With the armature removed, now I can remove
the pinion gear. Now remove the bearing from the armature. I put some rubber vise jaws on my vise, and
I’ll clamp the armature in the vise. Then I’ll use two screwdrivers to carefully
pry the bearing off of the armature. I want to be careful that I don’t damage the
fan. Now, I can install the new bearing. I’ll place the metal bracket over the armature
first. You’ll notice on the one side there’s a bit
of a hub, and that hub should be pointed down or towards the fan. Then, I’ll place the bearing onto the armature
shaft and use a socket to tap it into place. Now, reinstall the armature gear. Now, I’ll install the armature back into the
motor housing. I’ll lineup the tabs on the baffle with the
cutouts in the baffle ring. Now, I can reinstall the gearbox, and the
switch should be on the left side of the motor. Now, I’ll reinstall the brushes. I’ll finish up by reinstalling the rear motor
housing. That’s all it takes to replace the 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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