If it's at all sticky or gritty, replace the motor. When you get the pump disassembled, turn the motor by hand. However, if the top motor bearing is damaged, the whole pump and motor unit must be replaced.
Your appliance parts dealer has impeller and seal kits. The whole pump and motor unit are easily removed with the machine in place. Vertical Whirlpool machines are direct reversing, two-impeller machines. Of course, if you're replacing the valve, it doesn't really matter you've got to disconnect the copper line, anyway. A better alternative (though it's not always possible) may be to leave the copper line connected to the valve, and disconnect the valve from the rest of the dishwasher. Make sure you have enough copper line remaining to re-connect it to the valve. If you disconnect the copper line from the valve, you may have to cut it shorter to get rid of the old brass connection fittings.
This makes it less likely to fail and flood the kitchen, but it can also make it more difficult to remove and install. It is usually copper-piped right up to the fill valve. But don't forget that there may still be water in the pump and drain line, even if the tub is empty! Have a shallow pan or an old towel standing by (one that will fit beneath the pump drain connection) to catch any water left in the tub or drain line. It is normally connected to the sink drain by flexible rubber hose and hose clamps. The drain line is also usually pretty easy to disconnect. (At 30-50 bucks per service call, that's an expensive mistake) I cannot begin to tell you how many times I've been called to fix a "dead" dishwasher, when the only problem was that it was plugged into the wrong outlet. Normally the garbage disposal switch is off, so there is no power to its outlet if you plug the dishwasher into that outlet, it will not run at all. Usually the other outlet beneath the sink is for the garbage disposal, which is wired through a switch near the sink. NOTE: If your machine is plugged in beneath the sink, make sure you get the plug back into the correct outlet.
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