Quote:
Originally Posted by maxnz
As for greasing, the gears already had some grease on them from previous years, so we didn't think much about regreasing them. We did take apart the gearbox in question at our regional because a key fell out (making one of the motors hot, indicating something was wrong). We took it apart, added a key, added a washer (to each CIM) to keep the keys in, then reassembled it and added it back onto the robot.
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I would definitely pop open the gearboxes and give them a good once over, clean the gears off and the housings out, and then reapply some red tacky grease. There are a few holes on the outside of the housing that allow you to tighten the screws down, etc. Those holes do have the risk of debris entering, although it is rare that it is enough to cause more extreme sounds like those in the video.