Mixer is more than 5 years old but has never been used. Mixer doesn't seem to be getting power. Will sometimes start at very weak speed and shuts off within 1-2 seconds. Other times there is no start at all.
Make sure that the carbon brushes are free moving in the holders under the black caps, one on each side. Note that the brushes are "keyed" so that they will only fit and work one way. There is a blocker at the bottom of the brush holder that is to be lined up with the corner of the carbon brush that's been shaved off. Use a torch and remember to unplug the power before you start. Next thing to look at are the wires and switch contacts underneath the back cover.
SOURCE: KitchenAid Mixer Squeaking
I would first get some canned air. Spray out the area around the Shaft. This is to make sure no harden food is up there. After that is clean spray some cooking spray "PAM"in the Shaft area. This should help. Good Luck
SOURCE: KitchenAid 250 Watts; Classic: Leaking Oil
Found this,may be helpful.
Why do I see oil leaking from the beater shaft of my stand mixer?
Some KitchenAid® stand mixers that are not used very often or have been tipped may experience slight oil leakage from the shaft or hub attachment. To avoid the oil leakage, KitchenAid suggests that you run the mixer weekly for short periods of time. Generally, the mixer may lose approximately X cup of oil before repair is necessary. The oil used is FDA approved and is not harmful to consume, should any get into the food that you are preparing.
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I would recommend that you first check the Hall effect sensor which determines the speed. I had this exact problem (but mine occurred with a 600 professional model) and I actually went out and bought another Hall sensor for about $13. I replaced the original sensor and made sure that the connection between the sensor and control board was nice and snug. My blender worked as good as new! But I was curious to know if my original sensor was defective so I put it back in mixer and again made sure all of the connections were tight. Guess what? My original sensor also made my mixer work! There was nothing wrong with my original Hall effect sensor except the connection between the control board and sensor was not adequate--unfortunately I didn't check the connections before I decided to buy another one. My guess is that the connection between the control board and the sensor probably loosens or comes undone over time from use and vibrations.
1. Download the mixer parts and diagrams from the Kitchenaid website to see what the Hall effect sensor looks like. 2. You'll need a phillips head screwdriver to open up the mixer. 3. Make sure that the connection between the control board and sensor is absolutely tight and snug. 4. Also, make sure that the orientation of the sensor connection between the control board and sensor is correct. it's hard to know which way the sensor should be connected because the control board has three prongs and the sensor can attach facing up or facing down. If, after you've made the connections, the mixer still doesn't work. Disconnect the sensor and reconnect it with the prongs facing the opposite direction and try it. I actually found the right orientation through trial and error. By going through this trial and error, I also had my Eureka moment when I realized that the original sensor probably would also work it were reconnected with correct orientation. 5. This whole process probably takes less than 10-15 minutes to perform.
SOURCE: Taking the top off my kitchenaid mixer
Remove the back housing by removing one screw and liftingand pulling rearward.
Remove two screws holding the metalic edge trim. This uncovers the seam. Screws are on the back.
Remove four visible screws from the bottom of the head around and near the pillar.
Now gently using a screw driver, push the metallic ring on the mixing head down and off.
This uncovers five more screws about the mixing head. Remove them.
Using a very small screw driver or punch, puch the pin out of the mixing head shaft.
Remove the mixing head housing.
Lift up on the motor housing to remove it.
The motor/gear housing is the top protion of the mixer. Its loaded with grease so do this over a covered countertop or some place easy to clean. The grease won't run, but it can fall out in gobs.
Make sure all sealing surfaces are clean, especially the gasket around the gears. This will insure a good seal. No gear grease in your famous cookies!
Reinstall in reverse.
SOURCE: My KitchenAid Artisan stand mixer won't turn on,
It sounds like something is obstructing it or the lever is bent. You will need to take the head apart to investigate further.
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