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Are you saying that field coils tend to wear out, get bad windings more often than armatures? The thing is, since I replaced the armature in my Health Mor Sanitation System vacuum, with a similar but slightly newer one, my vacuum has been working perfectly since then. That was over a year and a half to around 2 years ago. I do believe that the same thing is happening with my Kirby 2C. The problem very well could be that the armature is shot, or just plain worn out and needs replacement. I would like an honest answer please, can armatures get shot, bad windings if the electrical clearance is disturbed, or if they are taken out of a motor that has not been taken apart before? Can the armature get shot if taken out of a motor at all, is there a risk of damaging the electrical clearance in an old vacuum motor, if everything is disassembled and then reassembled? I believe that when I took apart my 2C, the electrical clearance or even the windings in the armature were damaged or something happened. Even though the armatures copper wiring to the commutator did not seem damaged, they did appear to be worn out and definitely blackened, meaning it was burning. So most likely, if it is the armature than the electrical clearance was damaged, causing the windings to get shot and the burning smell to occur.
From Liam