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brian015
RC-Monster Aluminum
 
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Posts: 768
Join Date: Jul 2009
Location: NJ
01.09.2012, 09:33 PM

The only time I had trouble with a pinion coming off like that was when my motor mount was misaligned, so the pinion was meshing at a slight angle with the spur. This produced a force on the pinion that pushed it outward toward the end of the motor shaft and it came off regularly, until I fixed the misalignment.
   
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