Help W/Bosch Table Saw

[Doggorloader]

Have used and enjoyed my Bosch (Model 4000) portable table saw for 5 years where it has received moderate use.

I just started a new project and it now is making a "grinding" noise with a burning electrical smell. I checked the brushes and they look fine. When you rotate the blade by hand it does seem to feel like it may be bearings? I'm pretty capable in repairing things but am asking a logical troubleshooting process on taking it apart so I then can order the correct replacement parts.

Thanks,
Tom

[cmoorejack]

Hey Tom,
Usually a grinding noise is gear related..however i have worked on a few of these and most likely the rear armature bearing has locked up and the whole bearing is trying to turn in the plastic housing [the bearing also sits in a little rubber cup and that is probably melting and causing that burning smell] of course as soon as you start taking it apart you should be able to discover the problem..
hope this helps...
Craig

[Doggorloader]

Succeeded in getting the motor assemble off the guide rails and out of the saw. removed the screws holding the motor casing together, removed the brushes, and now I can't seem to get any further. It seems loose enough to come apart but I don't want to force it.

Before I took it apart I cut one last required piece for a project and the motor had such a tough time starting it actually spun the blade nut loose. That was it, done.

Now, by looking at the parts drawing, it definetely seems as though bearings are bad, but, there is also a gear in the front of the motor. Is that a possibility that it's stripped as well?

Once the case is apart (if I get that far) are the bearings pressed into the case? Am I getting to the point where I send the motor in to Bosch or am I still on the right track to ordering parts to fix it myself?

Thanks,

Tom

[cmoorejack]

Hey Tom,
If you haven't been able to remove the housing case..this may be one for bosch..[you would also need a special puller to remove the bearings from the armature]..it sounds like the motor has more damage then a simple repair..
[ereplacementparts.com also doe's repairs]
hope this helps...
Craig

[Philp]

Hello,i have worked on alot of these, and dewalts portable saws,One thing that i found is very common is that they tend to get hot enough to melt the plastic around the field which makes it hard to get the armiture out. Double check that you`ve gotten all the fastners out of the case and using a flat screwdriver pry (gently) on the top the armiture usually they`ll pop out so you`ll be able to see both bearings and be able to inspect both the field and the armiture. I hope this helps in this case,good luck