Whirlpool dishwasher won't spray

We have a Whirlpool wdf750saym3 dishwasher. About 2 days ago it stopped spraying water during the wash cycle. Here's what's I've observed:

• The bottom does fill with water
• At times that I would expect the spraying to start, I only hear a series of soft clicks
• The water drains into the disposal and is very clean
• Under the dishwasher, there is a white translucent ribbed tubed that I hear and feel carrying water
• Even with the water flowing, none comes from the rotating spray arms
• I have cleaned out the spray arms. They had very small bits of debris in them, which is now gone

Does this mean that the circulator motor is toast? If so, does it have a fuse or anything like that to look at before I attempt to replace it?

Thank you.

 

You need to check for 120vAC at the two wires that go to the wash pump when it should be running. If there is no power it could be a blown fuse inside the control box. The tech sheet will help you.

Below is a pdf download link for W10751166 rev.C tech sheet.
Let me know when you have it as I don't usually leave them posted.

OEM # W11032770 wash pump motor assy.
The pump needs a special pair of crimping pliers to crimp the hose clamp.
Shown in the amazon link...... Pump on amazon

 

I got the document. Thank you. I'll review it and check.

I saw elsewhere to check for blockages in the motor. I'm not sure how to do that, but that might not apply here. If the motor were blocked, wouldn't I still hear it trying to work? I hear nothing at all besides a soft click when I would expect the spinning washers to start up.

 

That is a high torque motor with a short duty rating posted on it. That means it will overheat quickly.
It is possibly to be bound and can't spin.
You may be able to lower the pump from the sump to check for a blockage and at that time you should see the impeller and try to turn it manually.

 

So, some more information... I removed the sump assembly. I took the circulation pump off and spun the impeller manually for a while. I inspected for blockages and found nothing. It was very clean, but I ran water through it to make sure. I was careful not to get water on the electrical contacts. I then put it all back together and started an empty normal cycle. During the wash cycle, it made a pretty loud grinding sound (more or less... if I didn't know what the washer normally sounded like you might be able to convince me it was just a really loud washer). This happened a couple of times. After that, it returned to how it was before I took it apart-- it filled with water, but the washing stages didn't work. I then did a 1 hour wash cycle and timed the cycles by this chart from the technician's manual:


When it got to the first heated wash stage it became completely quiet, no activity at all, for 3 minutes, and then drained. It seems like spinning the impeller allowed it to work for a short time, but then it failed again. Is there any way it could be anything but the circulator motor? I'd like to test the power input, but it seems like the loud, grinding sound indicates that it has power.

 

It certainly sounds like there is something hitting the impeller.
The motor is probably thermally protected and is going into overload/thermal shutdown.

Can you get to the plug and connect your meter ?
You really need to know what the power is doing.