Davinci 2.0 duo extruder vibrating

Hello everyone,

I've got a problem with a hand me down Davinci 2.0 Duo (First time owning a 3D printer). I've got Repetier firmware installed and I'm able to print from one extruder. The second one only seems to work when I first load it. It's not clogged, I've cleaned out the gears that feed the filament but it won't budge. When I send the command from Repetier host it just vibrates.

I can feel it tug on the filament at first but then nothing. 

Does anyone have a suggestion for what I can try.