My Bosch Nexxt 500 Series washing machine's deflector sheared off this past weekend.

1) First of all, what does the deflector do, and do I need to replace it?

2) Do I have the right replacement part? The piece that sheared off is a flattened cone (triangular shape) with a hole drilled into it (probably to allow water to drain through?) I am not sure if I have the right replacement part (part #644226) because the triangular portion is now just a flat piece.

3) Are there any instructions on how to do the repair?

Thanks!