Today my 690 died, big sparks, some smoke and then brrrrrrrraaaaaaaaaaaaahhhhhhhhhhhh.
With play at the bit, it was obvious a bearing gave out. Being from the school of try to fix it before you trash it, I got to work. First things was to remove the brushes from both sides. A flat tip screw driver makes quick work of this simple step. The brushes are kept under tension by springs. They must be removed so the armature will come out freely. These are usually the first things to wear out on an electric router. Which is why they were designed to be so simple to replace.
Next loosen the two screws from the top of the housing
Lift and let it drape to the side as you remove the two additional screws.
Gently tap up and around on the housing. There is a small bearing on the top of the armature that is seated in there, it should take very little effort to get the housing off.
Here is the top bearing, check it and replace if necessary. This one is fine.
The next step is a bit trickier but not difficult by any means. The collet nut is going to be on tight. An impact wrench would make short work of this step but I don’t have one. Instead, I applied heat to the nut in order to expand the metal a bit.
Wrapping the end of the armature in a shop rag and putting a 1 1/8 socket on the nut, I then proceeded to bust mine. It’s on there tight…
Here is the nut removed.
Now its time to unseat the armature. A bearing press would be ideal for this step, but once again, I don’t have one. A few taps on the metal bolt should drop it right out. Be carefull not to hit the threads and make sure your ready to catch the armature when it falls.
Almost there, now you can see the lower bearing. It is held in with a pinch ring. There is a special tool for removing them, but sharp needle nose pliers and a small flat tip screw driver will yield the same result. Once removed, flip the housing over and put a socket, of the same diameter as the inner race, on the bearing.
A few taps with a hammer and out it will fall. Here is the shot bearing.
Total time invested so far, 15 minutes with taking pics. The part, with shipping, is under $20. That’s a lot cheaper than a new router. When your self employeed, every dollar not spent is almost like a dollar earned.
Once the bearing arrives I will walk you back through putting it together. If I don’t make it back, here is the big trick. Put your bearing in the freezer, overnight, prior to install and it should easily slip back into it’s seat.
Just because tool companies designs their tools to eventually fail, that doen’t mean we have to throw them away. Atleast TRY to fix them first. Even if you can’t get it to work again, you will have learned something about how the tool works and will have made an effort.
In todays world, even a failed effort is more than most people will do.
-- It's only wood.