Remove the back handle from the hammer drill, disconnect the worn brushes and remove them from the holders. Install the new brushes and connect them and reattach the the back handle. For the bit holder assembly and the knob assembly I viewed ereplacementparts you tube video. Here is a link to it.
... Read more https://www.youtube.com/watch?v=39X7pzONOSU
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Hammer setting on drill would not engage when knob was turned to the hammer setting.
1. Disassemble entire body of the drill
a. Disassemble bit holder
b. Turn setting selector knob 45 degrees past the hammer only setting by pressing in on the red button. Use a flat head screwdriver to pry out the selector knob.
c. Use T20 torx to remove screws the front section of the body.
d.
... Read moreRemove all of the internal components now exposed
i. Use a flat head screwdriver to remove the u-shaped lock holding the gears together
ii. Continue to remove all internal components.
e. Remove handle cover plate and detach handle from main body of drill
f. Remove screws and brushes to turn atmature
g. Remove armature by pulling main body out of rear plastic portion of the body
h. Use a screwdriver to pry the armature out of the center portion of the body. The bearing fits very tight.
I recommend de-greasing all of the internal gear components with mineral spirits
2.) Reassemble as the drill was taken apart.
a. Insert armature into main body part
b. Put rear plastic section with field over armature
c. Reinstall brushes
d. Reassemble handle
e. Reinstall gears
f. Apply plenty amounts of grease
g. Reinstall front portion of the body
h. Before replacing the selector knob, use a screwdriver to push the metal piece inside the selector knob hole towards the rear of the drill.
i. Press the selector knob back into the body, similar to how it was removed. 45 degrees beyond the hammer setting.
j. Reassemble the tool holder.
I recommend watching the following videos from ereplacementparts.com to take apart and reassemble the drill.
Do not take drill apart
Selector switch can be removed without disassembling the drill. You have to pry up slightly on switch and push the red button, rotate clockwise till tabs line up, switch will pop out.
Press new one in push down and turn counter clockwise it will drop it once it is turned push in red button while turning
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