The model is says "RDX1015" and serial no. 137.271.1400
So I've been meaning to replace the bearings in the motor for some time now since this saw is atleast 25 years old by now but otherwise still works. One bearing is okay, but the other bearing is totally shot, so I plan on replacing both of them.
So I ordered the proper bearings according to the model online and such, but for the life of me I can't figure out how to put them on. One bearing, I got off simply by breaking it, and the other one I haven't attempted yet. The more problematic bearing shaft is flared, so I can't understand how it is supposed to get on there. The other bearing shaft isn't flared.
I really need to have these replaced asap for a job coming up. I've attached pictures so you guys can see what I mean.
Both bearings come off rather easily - neither end of the shaft should be flared. It's a 2 minute job if you have a 3 jaw puller and/or bearing splitter. If not, an easy way is to hold the bearing you want to remove in something like a vice, with the rest of the armature hanging free below, and then tapping on the end of the shaft (down). Use a dead blow hammer, wood mallet or hammer and block of wood to prevent mushrooming out the end of the shaft. Be sure to have something soft below to catch it when it pops free.
Now the gotcha. That motor has a plastic housing that also houses the rear bearing. If overheated, the plastic housing distorts and causes all sorts of problems, including allowing the armature enough free play to come into contact with the field assembly. There is a metal or plastic (depends on model) 'cup' that the bearing fits into, which in turn fits into the housing (see photo). Make sure it's not deformed and everything lines up correctly when re-installing - or sparks will ensue and the magic smoke will be released. Hint: A replacement motor for that saw costs more than buying a new saw
One thing to try if installing the new bearings is tough- Put the armature assembly in a freezer, and the bearings in a warm oven before pressing on. The shaft diameters will shrink slightly with cold, and the bearing diameters will increase slightly with heat.
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