Machine Running Louder Than Normal

My dishwasher has gradually gotten louder over the past month. It doesn’t make any squeaking sounds and usually doesn’t start until a few minutes into the cycle.

Once it gets loud, it sounds almost like a truck running without the muffler. Is this the motor or another pump in the system that could be causing the noise?

What do you guys think?

Take the lower spray arm off and see if there is any broken glass or other hard material in the area of the filter screen.