[JesseK]

This afternoon, when making an upgrade for an existing conveyor, I tried to stick a 'stock' 9015 from a couple of years ago into one of our three AM Planetaries. It turns out the default gear on the 9015 is a 13T gear, whereas the AM Planetary requires a 15T gear. For planetary gearboxes in general, this difference in diameter makes a big difference. Double check that the pinion on your motor is 15T.