Lower spray arm came off

Dishwasher Repair
1

lower spray arm has come off and I don’t see what would have held it in place…children may be involved.

2

The spray arm cap (#23 on the diagram) screws into the top of the pump and holds the lower spray arm in place.

Here are the breakdown diagrams and Replacement parts for WHIRLPOOL DU8770XB0 | AppliancePartsPros.com

Gene.