Repair was simple. I unscrewed the old grommet which held the old spray arm and screwed-on the new one. About 30 seconds was required. Other people having this problem should note that the spray-arm is made of three pieces which are inseparable when the arm is new. The arm is sold in this form. However, when your machine is having the problem that the arm falls off, the three pieces become separate. When you want to replace the spray arm, only one new part needs to be ordered because this part encompases all three components.

Unscrewed retaining ring, replaced unit = piece of cake

simple repair..woke up one morning and after the dishwasher cycled, I noticed the upper spray arm laying on the top tray.
ordered new one from site, was delivered with-in 2 days ( with standard shipping) all 1 piece, took seriously 5 seconds to unscrew by hand and replace!

The parts above fell off or broke and were not covererd under warratee. I called you guys, the parts came in a few days and I snapped them on. Your service was very good.

Unscrewed the old spray arm and replace with the new spray arm.

The best part was in the ordering process. Having the diagrams with the parts let me see that I was ordering the correct part. Thanks!

Unscrewed upper sprayer by hand, screwed new one in by hand. Piece of cake!

Discovered upper wash arm had come off. It looked like it was repairable, but the bushing/clip holding the arm came off after one wash. Looked on line and reviewed part and saw it was a one piece assembly from photos. Removed old assembly by unscrewing from top of washer and screwed new assembly in place.

The spray arm comes off into 3 parts but is really only supposed to be one. I removed the nut from the old assembly and attempted to place the new assembly on by hand. The new nut seemed to be slightly smaller than the original so it would not attach to the dishwasher. Using a kitchen knife, I removed the new nut from the arm unit and attached the new arm to the original nut and it went back on easily. The connection of the new arm to the new nut was 3 tabs that needed to be depressed with the knife and was a different conection method than the assembly that kept coming off in the wash cycle. The replacement part had a much better design than the original.

unscrewed the old upper arm spray nut off and rescrewed the new one on....very easy...then I took the old gasket out of the bottom of the door and replaced by sliding it in. very simple....less then 15 minutes for both and have solved my issues.

unscrewed old spray arm, installed new arm. Took less than 30 seconds.