I have a KitchenAid ProLine 600 575 Watts Stand Mixer It is only a few years old and has had very few hours of use. From the time I got it I thought it was very loud and noisy. As I increase speed the mixer makes a very loud noise with a high pitched wine. Any suggestions about repairing by my engineer son or a professional?

It's an easy job but can be a bit messy since you need to open the grease-filled gear box. The following Service Manual shows all you need to know:

http://www.kitchenaidparts.eu/documents/pdf/service-manual/classic-svc-manual-new-email-version.pdf

After many years dealing with Kitchen Aid mixers I purchased a pro 600 for my wife as an early Xmas gift. After just a few usages it started making a clunking noise in the gear housing. I removed the housing and discovered the casting is of very poor tolerances and the main drive assembly was lifting from the torque of the motor and causing the gear assembly to lift out of the casting and skipping on the worm gear. I am sure it is going to happen to many more of these units as the casting area that holds the bearing in is to large obviously an overdue mold in the casting process. Time for a recall Kitchen Aid.

I think that the mechanical speed control is stuck. Unless you are not afraid to take the mixer apart, you will need to take it toa shop or return it to the store for another one.

Are you sure there's power in that wall outlet? Try plugging something else in there

Obtain a copy of the Repair Part List for your model from Kitchenaid.com
Download the Service Manual :
http://www.kitchenaidparts.be/centers/servicemanual/mixer.pdf

It is not exactly for your model but you can learn a lot from it.
Open up your mixer. Get rid of all the grease. Replace the Worm Gear.
Use fresh Kitchenaid Food Grade Grease on all gears.

Caution: Do not use a screwdriver to pry out the Planetary Assembly.

It sounds like you have a stripped gear. I, too, had this problem when my bride dropped a wooden spoon into the bowl. You'll need to disassemble the mixer and determine the part(s) that need to be replaced. With a google search for parts for your model, you can not only locate the exact part, but can also get exploded diagrams for your model. Very handy indeed for disassembly/reassembly. I'd get the diagrams first and then determine the parts needed.

Hope that this helps you.

Best regards, --W/D--

the solution to this is to tighten the screw visible through the base that intersects the pin. Turn the machine upside down and using a long flat screwdriver tighten the screw.

The "wobbling" sounds like an issue of beater to bowl adjustment, which can come out of alignment naturally over time and with use of the machine.

If the flat beater is striking the bottom of your bowl, this may cause the locking mechanism to loosen and may cause the mixing head to "bounce" during use.

Your Use and Care Guide will cover the "beater to bowl adjustment," which you can do at home in a few minutes with a flathead screwdriver.

Also, leaking of oil in a stand mixer is not necessarily indicative of a large problem.

Kitchenaid stand mixers are overpacked with oil to last the lifetime of the motor. If the motor sits idle for some time (is not used), the oil may begin to drip from the gears and settle. Oil leakage may primarily be seen from around the beater shaft or planetary action.

A stand mixer can lose up to a 1/4 cup of oil before it needs to be serviced.

It is recommended to run the mixer on speed 10 for 2 minutes in order to redistribute oil back into the motor. In order to prevent future occurences, this is recommended to be done every 3 weeks if mixer is not being used.

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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This is "middle of the line" Kitchenaid as far as bowl size and motor strength goes. However, it is a great mixer that will probably fit your needs.