Fletcher Makes his Maytag Dishwasher quiet! (MDB9959SKZ)

Fletcher makes repairs to his noisy Maytag MDB9959SKZ, ultimately replacing the pump assembly part W11416363 (a.k.a W11416362)

Our Maytag MDB9959SKZ 0 dishwasher was making a loud grindy noise during the wash/recirculation cycles. I'm sure it was quiet when we installed in four years ago, but it gradually grew louder and we had just gotten used to it. We recently visited a friend's house and heard just how quiet a dishwasher CAN be. I almost just purchased a whole new Bosch like theirs, but their model was only rated 3db quieter than ours, so I new there had to be a mechanical problem with ours.

First, we disassembled and cleaned the inner filters, but we did not find the cause of the noise. We disassembled the pump assembly and cleaned the impellers and filters, but that did NOT fix the noise.

Not wanting to make this a lifelong project by replacing just one part at a time, I bought a COMPLETE replacement pump assembly. {Part #W11416363) The part was available on Amazon for around $210.

For our particular Maytag dishwasher model MDB9959SKZ, we needed
Whirlpool W11416363 OEM Dishwasher Pump and Motor Assembly

This video shows each of the phases, outlines and timestamped below.
Jump to 21:50 to see the assembly removal and replacement.

00:00 Intro
02:26 Simple filter cleaning
10:12 Initial Disconnect
13:14 Initial Pump Disassembly
16:02 Initial Pump inspection
16:30 Initial Pump Reassembly
21:46 Initial Result - no change
21:50 Talk about the replacement part
23:56 Remove the old pump assembly
27:32 Install the new pump assembly
33:49 Final Result