Assuming you have a texture on the belt, animate the appropriate offset on the Image_Map node.

Which to animate (U_Offset, or V_Offset) will depend on the orientation of the UV map of the belt.

Let's suppose the belt is UV mapped horizontally. So you have to change the U_Offset from 0 to 1 to do one full "rotation".

If you want it to rotate around 3 cycles, then animate U_Offset from 0 to 3.

If you have a color map and a bump map, animate both identically.

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