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Make sure you have the bowl, lid and sometimes the pusher assembled correctly. If everything is not correct it will not activate the safety switch to allow it to start up.
To work properly the bowl needs to first be in the correct place, on model 770 which we have here it is handle in the middle at the front. Then the lid goes on, it's obvious which way is correct with that part and then the pusher must be in the tube to activate the safety cut off switch. It is very rarely the cutoff switch itself which is inside the motor housing. If you look at the motor unit without the bowl on you can see right in the middle up by the top of the housing a hole with white plastic inside it. That's the safety switch that all the levers in the bowl & lid activate. If you turn the unit on (no bowl) and push the run switch down then activate that safety switch be depressing it in with something plastic the motor should run. That will prove to you at least that it's not the motor. That model is close to end of life now, bowls & lids are scarce and the general purpose blade is finished.
Determine first if it really is the motor. Does it only cut out if loaded or will it happen without any load? Remove all bowls and blades, plug it in and turn the power on and press the on button. With something plastic press the small white button that is in the middle above the switch panel and normally hidden by the bowl. This is the safety cutout switch avtivated by the bowl, lid and pusher being in position. Does the motor run while the button is depressed or does it again cut out after a short time but with button still depressed. If it doesn't cut out it's likely that wear in the complicated mechanisms in the lid and bowl handle are releasing the cutout switch with small vibrations of motor running. I figure out which one to replace by swapping out one of the 2 parts for a new one as I try to carry both parts in stock for that purpose.
With the bowl off activate the safety switch and turn the machine on. If it runs you have a problem with the mechanisms in the lid or bowl that operate the safety switch.
Does the actuator push down far enough to catch the button at the bottom? I repaired one simply by adding a vinyl screw cover to the top of the button so it was tall enough to be reached by the actuator.
Most likely it will be to do with the bowl or the lid. The safety mechanisms in both parts are likely culprits, they operate a micro switch just above the switch panel and hidden by the base of the bowl. Have just the bare motor plugged in and turned on with the run button depressed. Now with something plastic depress that small black button, the motor will likely start running. That proves motor is fine and you need to figure out which of the bowl or lid is the faulty part. The pusher needs to be in the lid tube before the motor will run in case you have forgotten.
I am assuming the unit is getting power. The "power" LED should be lit up on the front of the unit.
The Kitchenaid food processors
have a few safety features implimented. If the unit is not assembled
properly, this may prevent the unit from turning on. Proper assembly is
below:
If it isn't all ready, please disassemble the entire unit. This means
removing the blade and/or disc, blade, removing work bowl, work bowl
lid, and blade.
Start by placing the work bowl onto the motor base. The work bowl
handle should be facing at 9 o'clock, which is out to your left. Rotate
the handle downward until it locks in at the 6 o'clock position, which
will lock over the center of the button panel.
Repeat the process with the work bowl lid. The blade does not need to
be present for the motor to engage, if this is an assembly issue.
If this has not resolve the issue, please ensure the outlet is receiving power.
If the unit is still not functioning, take a close look at the bottom of the work bowl where it meets to the motor base. The work bowl, when locked in, depressed a gray plastic peg. This is the safety mechanism. You may trying depressing this peg on your own with a pencil. If this activates the motor, this may indicate your work bowl is no longer seating correctly.
Also check the work bowl handle to make sure nothing is cracked. There is a plastic assembly in the handle that acts as a second safety feature.
If either of these things seems to be the culprit, I would suggest seeking a new work bowl or work bowl lid to correct the issue.
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