[FTC]: 4 Stage Gear Train HELP!

[HAL3019]

In order to propel the balls we created a 4 step train.

(=) is bound to, (->) is meshed to

120 -> 40=120 -> 40=80->40=80 -> 40 This multiplies our output speed by 36 times (5544 rpm).

This worked great until recently when it hung and the motor began smoking.
Now on our 3rd new motor we need some serious help; how can we modify this so that it will actually spin down the train. When the power switch is thrown the motor twitches and hangs.

Thank you all in advance,
HAL