Try removing the litter guard around the bowl to see if that makes the noise stop.
If your litter system is making a grinding sound, it may be caused by stray litter getting in between the bowl and the base of the unit. If waste is breaking up into small pieces and falling through the conveyor, this can happen if you are using non-clumping, scoopable littler or the litter is not filled up to the fill line. Using clumping, scoopable litter and having enough litter in the bowl is critical to the optimal functionality of the Simply Clean.
If your system is making a clicking sound, or is making a sound that is unusual but not a grinding, the unit most likely needs to be replaced.
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