Replace Bosch Colt Bearings

glenn bradley

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SoCal
Boredom can do wonderful things. I tossed this Colt with shot bearings into its blow-mold case and tucked it up in the rafters. At the time, I just couldn't spare the cycles to replace the bearings. While sorting (read thrashing) through the pile of stuff that is waiting for the new shop to appear I found the case. To myself I think "I coulda swore I tossed all these useless things." I picked it up and it rattled . . . ah-ha!

Double sealed bearings delivered for about $15. About an hour of my time. Bear in mind I have no bearing puller or press and have never done this before. Believe me, I am not bragging. I am declaring that if you have a dead Colt laying somewhere, take an hour out of your day and bring it back to life. If I can do it, anyone can do it.

You take the three screws out and get about this far . . . helpful hint; remove the brushes :doh:

Colt-Bearings (1).jpg

Then it pulls apart easily.

Colt-Bearings (2).jpg

Oh yeah, I had no spanner wrench either. I drilled a couple holes in a scrap of plywood and tapped in a couple of punches; worked fine.

Colt-Bearings (3).jpg

The bearings didn't feel all that bad and I looked around for some other cause of the chatter and horrible noises it made while running. Nope, everything looks good and fits tight so, swap the bearings. By the way, don't lose the wavy washer that is deep inside the blue plastic housing.

Colt-Bearings (4).jpg

I used an open end wrench and a mallet to get the small bearing off the shaft. Use a puller if you have one, it would go quicker. The large bearing pushed out easily. I cleaned everything up inside, used a couple of blocks of scrap and my twin screw vise to press the small bearing on.

Colt-Bearings (5).jpg

Fiddle it back together and it runs like new.

Colt-Bearings (6).jpg

Time for a cup of coffee.
 
I need to do a similar surgery on a Dremel that I let the smoke out of last year. In this case I think it's the motor and not the bearings, but your post here has reminded me to go do a little searching for a replacement motor. :thumb:
 
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