Shear Repair – Replacing the Armature Bearing (DeWALT Part # 330003-09)


Video Introduction: 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 a squeaking or a 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 grill, 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. Mark Sodja: I’ll begin by removing the rear
cover from the handle. Now, I’ll remove the brushes, I’ll pull the
brush spring back, and then, I can pull the brush from the holder, and I repeat this on
the other side. Now, remove the screws that secure the gearbox
to the motor assembly. Now, remove the fiber washer from the pinion
gear, and next, the armature, from the motor housing. Now, remove the motor plate from the armature
bearing. I’ve opened the jaws of my vise just wide
enough for the motor plate to sit on the edges, and I’ll tap the armature out of the motor
plate. I want to be careful doing this because if
I strike the armature too hard, I can crack the motor plate. Now, remove the bearing boot from the commutator
side bearing. There are two identical bearings used on the
armature. The one on the commutator side can be easily
replaced. The bearing on the side of the armature where
the fan is located is recessed down into the fan and it’s very difficult, if not impossible,
to remove this bearing without damaging the fan. If this bearing has gone bad, more than likely,
you’ll need to replace the entire armature assembly. Now, remove the bearing from the armature,
I’ll use a bearing separator to do that. I place the separator over the bearing, tighten
it up, and I’ll place the separator over the jaws on my vise. I’ll use a socket that’s slightly smaller
than the inner race on the bearing and I’ll tap the armature shaft out of the bearing. Now, I can install the new bearing. I’ll place it onto the armature shaft and
use a socket that has a diameter that’s about the same as the inner race on the bearing,
and I’ll tap the bearing into place. Now, I’ll reinstall the boot on the commutator
side bearing, and I’ll reinstall the armature into the motor plate. Now, I can install the armature assembly back
into the motor housing. Now, I’ll reinstall the fiber washer onto
the pinion gear, place the seal back into the gearbox, and I’ll reinstall the gearbox
to the motor housing and secure it with the screws. Now, I’ll reinstall the brushes. I’ll finish up by reinstalling the rear half
of the handle and securing it with the screws. Now, you know how to install a new ball bearing
in your power tool. Video Conclusion: 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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