Motor and gears

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skullystitches

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Location
Canada
Arrma RC's
  1. 4x4-Mega
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?
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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.
 
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
 
You want just a little bit of play between the two gears, close but not locked up.
 
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