Toshiba e-studio 310c

Hi people!
Got this malfunction on a Toshiba e-studio 310c: found a cian developing spiral broken on the top (by the bushing, near the rear gears area). rebuilt the broken spiral(!!!) and set up the machine with better prints there it has before. Now another malfunction came: it doesn't feed enough cian toner... I mean: the spiral is o.k., the toner motor turns, but to keep it working we have to takeout the imaging unit and turn the toner bottle gear by hand (do this 3 times!!!) to feed toner enough! Checked the toner motor area and everything is fine. The toner bottle seems o.k. too...
Can anyone help? How can I force the toner motor to work much more?
- This is a 600dpi fabulous machine!!!