The most common cause of such problem is a broken seal inside the pump and not a pump housing.
In order to fix it you have to order the impeller & seal kit.
Also, based on my experience, it is almost not possible to remove the disk and mount assembly (#10 on the pump and motor break down diagram
You have to break it off (very careful not to damage the pump housing).
The old impeller has to be broken off too.
Remove the screws holding the pump housing to the motor, remove the pump housing from the motor and remove the seal from the pump housing.
Using a fine file, clean the motor shaft. Make sure the motor shaft seal head (#8 on the pump and motor break down diagram
) is moving freely on the motor shaft.
- The part number for the impeller and seal kit AP3108052
- The part number for the disk and mount assembly AP2909490
- Here are the break down diagrams for the Whirlpool dishwasher Model RUD1000KB1