Remove the float only by pulling it up. According the diagram there is nothing is holding it. Check it for any deposits, clean if needed.
If that not going to help check if the lower arm rotates when the dishwasher is running, check if any jet holes are blocked and both filters are clean.
Here are the breakdown diagrams and Replacement parts for Maytag MDB6650AWS DISHWASHER- UNDERCOUNTER | AppliancePartsPros.com
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