Gearbox 3 problem
 

Alright, I opened my gearbox for the first time in my life. Now I've got a small problem. When I push the bevel gear with a screwdriver, the gears are rotating properly and nozzle is moving. But when I attach motor and try to shoot, only thing I can see/hear is a terrible *SCRREEEEEAAAAAK* voice. And sector gear isn't moving like then when I push bevel gear with screwdriver. When I take motor in my hand and shoot, it works well. So what's wrong? :|

Check the motor heigth adjustment. Sounds like the motor needs to be raised.

Check the shimming too if anything's been changed in the box.