Problem with the spindle,not work nicely. I took out the fanuc ac motor and took off his belt,I took off the lid and clean the sensor re-adjust gap. Clean made everything and tried the motor without belt .The motor responds to the speed, But in the low rpm no power.I have to mention that this machine still stands on high gear,and should.be at low gear.Maybe that's the problem...My other machine (sister) changes depending on the set speed,while on this still stands on high gear.The button low high gear will not react (in other machine work).which is the principle of shifting?Does anyone know what could be? Why leaps alarm because there is no force in the beginnin. I think this is a problem.When I returned belt eject alarm in spindle drive unit #2 speed devation