[Steve_Alaniz]

Banebot has a problem with their transmissions. The tolerances are off... Sometimes the motor shaft pushes up against the case of the transmission... I have 4 and two of these have that problem. I put a small washer on all 4 screw between the motors and the transmissions. It backs the motor shaft back just a bit but that's all it needs. This creates a gap around the motor to transmission joint, but I can tape that and the unit runs smoothly. If that's not for you, you can try making a spacer gasket with just thick cardboard.
I've done both and they've worked perfectly. I went to the washer because... I'm Lazy... It's a gift. (If you want to find the most efficient way to do something... put your laziest person on it.)

Hope this helps

Steve

(Some of you sound like you might have a different issue... but look in the transmission and see if you are getting small metal pieces or scratches on the inside of the transmission. either of these is the spacing problem. I've worked with 8 Banebot transmissions and this is the only problem but it's a darned consistent one!)