A friend of mine bought several new Makita Angle grinders at auction, and two of them didn't work.
I took them to see if I could repair them.
The first one was simply missing one brush, and I had one the same size, so that fixed that.
The second one apparently had been used for a few minutes, then burned up. Upon disassembly, I found that the the armature was black from getting too hot (not from normal carbon build up).
I cleaned it all up, and upon reassembly, it simply wouldn't go back together.
I looked down in the bottom of the rear brush housing and saw what appeared to be a bearing cap.
I fished it out and tried to put it on the shaft, and it would not go.
I flipped it around 180, and it went on perfectly.
I was able to reassemble it and it runs fine.
Perhaps a machine was used during assembly at the manufacturing plant, and it put the bearing cap in upside down, the forced to two housing together.
Anyway, it was a fun project.
I saw some burnt plastic in the bottom, and it still has that smell, but it seems to be running fine.
He might get a few bucks for it.
I took them to see if I could repair them.
The first one was simply missing one brush, and I had one the same size, so that fixed that.
The second one apparently had been used for a few minutes, then burned up. Upon disassembly, I found that the the armature was black from getting too hot (not from normal carbon build up).
I cleaned it all up, and upon reassembly, it simply wouldn't go back together.
I looked down in the bottom of the rear brush housing and saw what appeared to be a bearing cap.
I fished it out and tried to put it on the shaft, and it would not go.
I flipped it around 180, and it went on perfectly.
I was able to reassemble it and it runs fine.
Perhaps a machine was used during assembly at the manufacturing plant, and it put the bearing cap in upside down, the forced to two housing together.
Anyway, it was a fun project.
I saw some burnt plastic in the bottom, and it still has that smell, but it seems to be running fine.
He might get a few bucks for it.
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