My Dishwasher Isn’t Quiet Anymore. It Sounds Like The Motor Or Pump Is Under Great Strain When Operating. Any Suggestions Out There?
Here are your parts
Replacement parts for WHIRLPOOL GU1200XTLQ3 Undercounter Dishwasher | AppliancePartsPros.com
Here is a tech sheet and a manual
http://www.servicematters.com/docs/wiring/Tech%20Sheet%20-%208537797.pdf
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/52521bdbd0ef763c85256cbc00520548/$FILE/8178022.pdf
If the units is not filling properly it will make the pump noisy.
Most units fill to just under the heating element.
Usually you would notice that the dishes on the top rack were dirty.
Open up the pump from inside the unit and check for debris in the impeller and chopper and filters.