Saeco Odea Giro pumps the water but the internal spline or gear is not turning moving the ground coffee grinds to the point where the water can pump to the front exit lines so the water is pumped into the over flow resevoir. How do I replace the gear or check to make sure this is the problem. I want to replace this myself.. Also how do I get the unit apart it seems to be bullet proof. Is this a common problem.

The typical process is this. Grinds the coffer at the upper coffee grinder, the ground coffee is moved to the the staging part where the machine then turns the internal spline or gear that is connected to the component of the machine that moves the ground coffee up to where the water runs through it, at this point in the upper position the water path is from the water container to the heater, then through the coffer and then into the connector that then runs to the exit of the machine where it goes into the cup. My issue is the gear is not actuating or turning to move the ground coffee up to the point where the water can run through it and the water path when it does not raise is to the overflow chamber. Everything seems to work fine and the water flow is good so its not not needing to be descaled. How do I remove the gear and replace the gear or spline or get it to re engage when it is suppose to? The typical process is this. Grinds the coffer at the upper coffee grinder, the ground coffee is moved to the the staging part where the machine then turns the internal spline or gear that is connected to the component of the machine that moves the ground coffee up to where the water runs through it, at this point in the upper position the water path is from the water container to the heater, then through the coffer and then into the connector that then runs to the exit of the machine where it goes into the cup. My issue is the gear is not actuating or turning to move the ground coffee up to the point where the water can run through it and the water path when it does not raise is to the overflow chamber. Everything seems to work fine and the water flow is good so its not not needing to be descaled. How do I remove the gear and replace the gear or spline or get it to re engage when it is suppose to?