Motor and gears

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I replaced a motor that burnt out for the 3rd time and when I started using my car again it’s sounded like it was slipping and it didn’t get much speed then it totally stopped. I took it apart and it looked like this. Any idea what could of happened so it doesn’t happen again? 093B58DD-3EE6-48CF-8B23-7235F654FFB1.jpeg 9DD5AC4A-4020-4F41-BC72-DAB2BC8E6E4D.jpeg image.jpg
 

aneft

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Gear mesh between spur and pinion may have been too tight or debris got inside the housing. Also check the bearings, if one seized that could cause that as well.
 
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Is the thing the spur gear sits on Supposed to move a tad? I didn’t noticed it the last couple times I took it apart
 

aneft

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You want just a little bit of play between the two gears, close but not locked up.
 

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