65sc02

I had a case of "stuck 71427 motor". Disassembly worked fine with the instructions given here. Removal of the outer cover is easy with a pocket knife. Then I de-soldered the commutator plate and pried it off. Left-right-left-right and it comes off. Now you have to remove the 4 locks in the corners of the casing. Just scrape them off with a small screw driver. Works fine! Now you can push the motor out: push the black axle inside and the motor will come out on the back. Use a thin screw driver and pry off the top metal ring. It is held in place only by magnetic force (strong!) Now you want to remove the coil assembly. This is tough! I used a thick washer (4mm) with a big hole in the middle (to fit the PCB board through). And a vice to push the coil assembly out. This did not work all the way but loosened the glue. The last mm I did with a screw driver inserted between coils and magnet. Using again a thin screw driver you can now remove the bottom metal plate with the magnet (very strong!) I did not try to separate the magnet ring from the bottom metal plate. I don't know if this is possible at all (might be glued or just held in place by magnetic force). In my case the cause of the failure was a broken magnet: its chromium outer seal had broken up and blocked the coil assembly. This may happen due to the motor falling down on the floor. Or due to humidity getting through to the magnet. This is, as far as I can see, a non-fixable failure: the magnet will always give off magnet dust particles which will block the coils.