First, I don't own this particular tank. The two I do own do come apart in a similar way. There are probably 4 to 8 screws in the bottom. Remove them and the top should lift up. Lift it up carefully. There are probably 1 or 2 wire looms with white plugs attaching the top and bottom. Make sure they are plugged in securely on both ends. If not, secure them and try it again. If it still doesn't work, you can remove the top by unplugging the looms from the top and unplugging the black wire (antenna lead) in the middle where the section of heat shrink is. If you have a volt meter you could probably check for voltage to the motor. If the motor is bad, their about $8. Good luck, and don't worry about taking it apart. It's really pretty easy.