Completely removed lower wash arm and replaced bearing ring and seal.

Removed spray arm thumb nut. Removed spray arm. replaced worn and broken earings and re-assembled in reverse order. Would have done the repair a lot sooner if I had known that PartsSelect was just a few miles up the highway.

The plastic parts on this spray arm assembly wear with time and the rotation wobble effect creates a wave action in the pool of water at the bottom of the dishwasher. This waves the water onto the front door and forces a leak outside the unit. Replace the lower arm assembly, washer, bearing and nut. They all wear. Also remember to tighten the screws on top of the pump assembly. They loosen and aid in the wobble. Good Luck!

I noticed the upper bushing washer was worn thin. this caused the lower spray arm to rise too high and wobble during all the wash cycles. Also the rotation of the lower spray arm was wearing grooves in the lower bushing.

I removed the retaining nut and simply replaced teh defective parts. While I was at it I figured equal wear might be evident on the upper spray arm so I bought a complete rebuild kit to bring all rotational parts back to new and equal preformance that was achieved by removing the ss screw and removing the upper spray arm, bushing and clip then replacing them in the order of removal. Noticed a huge difference in the quality of the washed dishes!! Thanks Parts Select 100% to yoru company!!

Removed washer from the cabinet by unscrewing anchor screws at the top of washer. But first I removed both dish racks. Shut off power and water to washer. Unhooked water line to washer. Lowered front adjustable feet so I could easily pull washer free from the cabinet. Disconnected wiring from the wall box to allow room to allow for more working room. Drain hose was plenty long on my washer so didn't have to disconnect. Before laying on side, I disconnected the lower and upper spray units. Lower spinner is attached with a hand tightened screw in the middle of spayer. This is a left hand thred. So I had to turn it to the right to loosen. The upper spray unit is simply removed by uncliping the clips from the long flat tube that runs from the lower unit to the top. There is a set of clips in the back of the tub and a set on top. After the clips are free, turn the flat tube to your right to unlock from the bottom spinning unit. Remove and lay the washer on its side. Also before I did that I unhooked the springs at the bottow of the door so to free the door from springing back up after opening the door while on side. Good idea too to have some towels handy to absorb spilled water from the washer. I used one under the open door while on side to protect the door and floor. There are three wire disconnects under the washer that hooks to the motor, etc. There are three vinal wedges that secure the motor and punp into the bottom of the tub. Remove them, disconnect the outer pump from the motor (made it easier for me to remove the unit through the hole in the bottom of the tub. This is a little tricky. Disconnect by turning the small pump to the end of the motor to your left to unlock. The small pump is a little stubborn to losen, but will break loose with presure persistence. After removing, simply push the whole unit up through the bottom of the tub to remove. Now you are ready to reinstall everything in reverse order. It is a good idea to have someone to assist with installing the motor and punp in the tub. I securely pressed it into the hole and the second person press the vinal wedges back into the bottom of the tub to secure the unit. Putting it all back together from there was a snap.
A big plus is the quick delivery. Regular delivery 3 - 5 days will do. I ordered my parts one day and received them the next by Fedx. Didn't even pay the extra for next day delivery. Everything worked perfectly. Just like a new one again. Very happy with the helps posted and service and parts provided by PartSelect.

After reading the diagrams and other readers' repair stories, I found that the plastic nuts and rings had worn out. The arm-spray wobbled excessively.

I simply twisted off the spray arm bearing ring and removed the other parts. The arm-spray was covered with mineral deposits that cleaning did not remove.

I received my parts overnight and replaced them according to the diagram. It's like having a new dishwasher!

I first removed the wash arm retainer nut then lifted the arm assembly out and replaced the spray arm bearing ring and then set the spray arm back in place and put the wash arm bearing ring in the hole and screwed the wash arm retainer nut back in place. I couldn't believe how much the 2 had worn down. It is working fine. Saved me about a $125.00 service call out here as I live 50 miles from the nearest big town. Not bad for a 68 year old female!!

This gets a little lengthy... but it explains where Cascade Dishwashing Powder came up with its brand name - it's been a cascade project.
I started by replacing the Middle Wash Arm Tube as the old tube developed leaks. As others have stated this is a new design but directly replaceable and easy to do.
This didn't solve the cleaning issue so reading the experiences of others on this site realized I also had broken parts in the Upper Spray Arm Assembly and the Upper Wash assembly. I replaced these and the dishes were suddenly much, much cleaner. These were very easily replaced.
I did find that I did not need the Mount for the upper spray arm (PS402277) as a redesign of the Upper Spray Arm Mounting bracket no longer required it - the bracket simply clipped in -the diagram was out of date.
Everything seemed to go well for about 3 loads when the dishwasher started leaking heavily out of the bottom of the door. I then noticed that the lower Wash Arm Bearing Ring and the Seal, Lower Spray Arm had disintegrated so I replaced those but this didn't affect the leaking. Someone had stated that if the lower wash arm assembly had too much 'wobble' that it cause 'waves' that would leak out the front door... mine had some wobble so I added a nylon washer from Ace Hardware that reduced wobble but still leaked.
I then replaced the Door Seal Kit - this was by far the most difficult part as the door needed to be removed and it was somewhat difficult - and it seemed apparent after we had removed the door that these parts weren't the problem but we replaced them anyway.
Also, someone else had noted that they had to attach the door seal (this is NOT the gasket that goes around the door opening) with a sealant - I had the same problem; the original seal fit tightly with friction but the new replacement required an adhesive - I used silicone. Still leaked.
From here on I can't guaratee any useful information: I took the strainer screen out of the bottom of the dishwasher and found one slightly loose screw holding what I believe is the 'pump outlet' according to the diagram. I had also read that the water fill is controlled not by the float at the bottom of the washer but by the electronics and it was suggested that I disconnect the DW from the power to 'reset' the timer, this I did and hit the 'Cancel' cycle a couple of times to make sure that all programs were cancelled. Whether any of this made a difference I have no idea - except that the dishwasher suddenly stopped leaking and hasn't leaked a drop for at least 20 washes. So I don't know, for sure, why it leaked or how I fixed it, but it's working and washing great now - except the tines on the lower rack are beginning to rust out and breaking off. The rack is pretty expensive but so far I've saved a lot of money and my family thinks I'm a dishwasher genius.

AIR INLET GASKET Had to pull dishwaher out, using instructions sent with part, turn it 1/4 turn counter clockwise, tap with screwdriver and hammer and it came right off. Put the new one on. It was kinda hard to get it to turn the last little bit, I had to use a screw driver and hammer to make it twist that last little bit.

Once I removed the wash arm from its base and figured out what had happened I ordered the repairs I needed from PartsSelect.com. It was extremely easy to see what was needed.
I had to have them sent overnight, because it was three days before Thanksgiving and the arrival of 7 extra people on Wednesday evening.
The package arrived Tuesday afternoon, I opened it, removed the old spray arm bearing ring, put the new one in place, placed the wash arm bearing ring on the bottom of the wash arm, set it in place, and tightened all of it in place with the new wash arm retainer nut. Started the dishwasher and I was in business!! It took longer to open the package and unpackage everything than it did to make the repair AND no chapped and cracked hands doing Thanksgiving & weekend dishes.