I need a repair manual for the servicing the gears and repairing the voltage controller circuit

Krups produce a premium product and it would be surprising if they didn't also have a repair or exchange service. Sometimes such a service is a reasonable cost and it is advisable to at least make the enquiry before proceeding further with your home repair.

Early food mixers used a number of series resistors for speed control and the circuit was fairly straightforward to check with a multimeter and any capacitors found are likely to be radio interference suppressors.

Later mixers use an electronic speed control and the best mixers use feedback to maintain the speed and torque when mixing or beating viscous material that would otherwise slow the speed significantly.
Checking/troubleshooting the electronics are beyond the scope of home repair, however, the circuit can be checked to the speed control fairly simply and then from the speed control to the motor and the motor itself. If everything else checks out then it would be reasonable to assume the electronic speed control has failed.

Early electronic speed control used either a thyristor as the control device or a diac/triac pair mounted on a small circuit board. Later types probably use a speed control module similar in principle to those found in power drills...

A model number would help but it sounds like you may have blown the fuse gear. I won't ramble on about how to do it (it's a big job for an ordinary person) until you come up with a model number.

That's a bit of a task to sort out. If you aren't up for a full strip down and clean up followed by new gears and repack with grease then contact Kitchen Aid for a local repairer. You will be up for a couple of gears and maybe even the top housing if the bush for the accessory drive gear is wrecked. If you need "how to" help then get back to me for step by step.

Kitchenaid mixer parts are available from a number of sources aside from EBay, among them:
http://www.goodmans.net/d/933/kitchenaid-stand-mixer-repair-parts.htm

http://www.shipfreenow.com/

http://www.seneca-river-trading.com/kitchenaid-stand-mixer-repair-parts.htm

http://www.mendingshed.com/kamisc.html

You may also need the Service Manual at:

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

Leaking oil is caused by the grease in the gear box separating. This often happens when the mixer is not used much and the grease is not kept mixed by the moving gears. The solution is two-fold. First run the machine more frequently. Second is to open the head and replace the old grease with an approved food-grade grease (6 oz. is the right amount). KitchenAid grease can be found online and at Ebay. The Service Manual can be found at:

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

While the Artisan series is not specifically referenced, the procedures are the same.

You can also take the mixer and manual to a competent repair person.

Get a copy of the Repair Part List for your model at Kitchenaid.com
Download a Copy of the Kitchenaid Service manual.

http://www.kitchenaidparts.be/centers/servicemanual/mixer.pdf

The Worm Gear (12) teeth was stripped and needs to be replaced.
The whole Worm Gear Assembly can be purchased on eBay for under
$15.00

Here is how your speed control works:

Speed Control
The speed control of the mixer is attained through the use of a governor assembly mounted at the rear of the control plate assembly.
The electrical circuit is made and broken by the action of the fly ball governor revolving against the control plate.
When the switch lever is moved to an ON position, the position of the control plate with respect to the governor is changed by the action of the switch lever.
Thus, when the control plate is set close to the governor, a relatively low speed of the motor causes the governor to make or break the mixer’s electrical circuit through the control plate.
When the control plate is set farther away, a greater motor speed is required before the governor starts breaking the circuit.
The action of the governor is such that the speed of the motor will remain constant for a given setting of the control plate within certain loads.
After certain loads have been exceeded, the speed of the motor will drop to meet the torque requirements of the given load.
Speed is controlled by the governor and the control plate in conjunction with the phase control.

TRIAC RMS VOLTAGE
BOTH CONTACTS OPEN - 40 VOLTS
ONE CONTACT OPEN - 80 VOLTS
BOTH CONTACTS CLOSED - FULL VOLTAGE
NOTE: The triac regulates the power the motor sees depending on control board contacts.
A device called a triac is a part of the phase control circuit.
This device determines the amount of power the motor sees dependent upon the condition of the control board contacts.
If both contacts are open, about 40 volts RMS is applied to the motor and about 80 volts is applied when either contact is closed and the other is open.
When both contacts are closed, the triac is full on; consequently, full power is applied to the motor. In this way, the speed is controlled.
If the mixer motor begins to run too fast for a
particular speed setting, one or both contacts open, which cuts back on the voltage the motor sees, thus slowing it up.
If the motor operation becomes too slow, one or both contacts will close, applying the needed voltage to the motor to sufficiently increase motor speed.
This is always accomplished through the triac.
The control plate contacts control the triac, and in turn, controls the amount of power supplied to the motor.

The control Plate for your mixer is PN
W10119326
http://www.marbeck.com/mixers_kitchenaid_parts.html

If your not good with tools / meters or tedious repairs do NOT attempt this yourself.
The service manual for your mixer can be found here
http://www.f-ems.com/download/DownLoad.aspx?DocsID=082009012917

and is:
LIT4177310-C

Hi VIC. The PC board you’re looking to replace is called the “Control Assembly” inside your mixer’s head, and yes you can order and replace it yourself. Just be sure to have the Parts List manual on hand. If you're lacking one, you can download a PDF version from the KA website at: http://www.kitchenaid.com/flash.cmd?/#/page/home.
Click on Customer Care>Locate Manuals & Guides> Enter the 6 character model number, in your case: KP26M1, and select one of the first two files listed under Parts List (47) (The first file, KP26M1XAZ4.pdf (304.18 KB), is for a -4 series model and the second file, KP26M1XAZ5.pdf (724.41 KB) is for a -5 series with slightly different insides, so make sure you have the correct Parts List manual.)
For a series -4 mixer, turn to pgs. 2 & 3, titled Case, Gearing And Planetary Unit that shows an exploded view for the disassembly and reassembly of your mixer, along with all the parts. Locate Illus. No. 8, Control Assembly. This is where I suspect your problem lies. (For a series -5 mixer, turn to Pgs 4 & 5, and locate Illus. No. 18, which is the Control Assembly). You just decide if you need to order a Black Knob or Grey Knob Control Assembly
As far as parts go, here are four potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com. Prices for the same part can vary widely between vendors, so do your comparison shopping. I don’t know if these vendors mail internationally, but you should be able to check their websites and find out.
Once apart you can check your mixer for any other unseemly wear and tear on the gears, etc. It can be messy but quite gratifying to diagnose and repair your mixer yourself.
Good luck. I hope this helps. Howard, Burke, VA
If this solution has helped you, please rate it, thanks! - hslincoln

Hi LEEMOSHER. You don’t indicate your specific KA mixer model, which limits possible solutions options, but I’ll give it the old college try!
When you say ‘switch gears’ I assume what you really are referring to is changing the speed setting. There is only one set of gears, but 10 speed settings, which make the beater turn faster. From your description of the symptoms, I suspect your mixer’s speed control board is having issues and should probably be replaced. Since I don’t know you model number, I can only provide you general instructions.
The inspection and troubleshooting of the inside of your mixer is a DITY capability, particularly if your mixer is out of warranty. Just be sure to have the Parts List manual on hand. If you're lacking one, you can download a PDF version from the KA website at: http://www.kitchenaid.com/flash.cmd?/#/page/home.
Click on Customer Care>Locate Manuals & Guides> Enter the 6 character model number and select a file listed under Parts List. Some models will have multiple files. Download one and check to ensure it matches your mixer model. If it doesn’t match, continue to look at other manuals until you find the correct manual that does match.
Depending on your model, locate the Governor Assembly and Control Plate Assembly on the pages titled: Motor Control Parts, or Control Assembly on pages titled: Case, Gearing and Planetary Unit. The illustrations provide an exploded view for the disassembly and reassembly of your mixer’s components, along with all the parts.
First inspect around the controller assembly to ensure all the wire connections are OK. It's possible a connection has come loose. Unfortunately the whole controller assembly is fabricated on a little PC board which was not meant to be 'home fixed', and my 'expertise' ends there. A local small appliance repair shop should be able to determine if the controller assembly is functioning properly or not, or you can just order replacement parts without the testing.
As far as parts go, here are four potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com. Prices for the same part can vary widely between vendors, so do your comparison shopping.
Without a clearer description of your clicking noise; i.e., when it occurs, where is the sound coming from, I’m at a loss to explain. However while your mixer is apart would be an ideal opportunity to check for any other unseemly wear and tear on the gears, etc., and you might discover something out of place that is causing the clicking. It can be messy but quite gratifying to diagnose and repair your mixer yourself.
Here are some links to several excellent websites that detail the disassembling/reassembly of a KA Mixer.

• http://www.artisanbreadbaking.com/discussions/kitchen-aid.htm
• http://www.neilcrockett.com/mixer.htm
• http://www.foodonthefood.com/food_on_the_food/2009/04/how-to-repair-a-kitchenaid-mixer-yourself.html

Between these three websites and their excellent pictures and descriptions and your Parts List manual, you should now be able to completely disassemble and reassemble your mixer.
If you feel troubleshooting and repairing is beyond your capability, then I would seek out a local small appliance repair shop in your area. KA Customer Care can give you names of local KA authorized repair shops in your area, but you can also do an online search to supplement what KA may provide you. Call to explain your circumstances and find out their hourly rate and get an estimate of what they think it would cost to repair your mixer. Also, always obtain three or more estimates – do some comparison shopping.
Good luck and have fun. I hope this helps. Howard, Burke, VA

Hi DELUNAY. The only way to tell if your speed control assembly is bad it to remove it and test it a local repair shop, but I think from the symptoms you describe, you’ve already answered your own question and your speed control assembly is shot. The fact that your motor is not making any noise indicates to me that it’s not getting power. That can only be caused by two things; a bad speed control board or a burned out electric motor. When you shredded your nylon worm gear, did the motor exude a ‘bad/burnt’ smell (other than possibly ozone)? If not, then I would look at replacing your speed control board/assembly.
Since you know you’ve got to replace the worm gear, you might as well replace the speed control assembly. The inspection and troubleshooting of the mixer transmission is a DITY capability, particularly if your mixer is out of warranty. Just be sure to have the correct Part List manual around when you start to disassemble your mixer. If you're lacking one, you can download it from the KA website (http://www.kitchenaid.com/flash.cmd?/#/page/home).
Click on Customer Care>Locate Manuals& Guides> and enter the 6 character model number, in your case use KSM50P and then select the first files under Parts List (definitely check to see if it matches your mixer. If it doesn’t, continue to look at other manuals until you find the correct manual that does match.)
Turn to pages titled ‘Case, Gearing & Planetary Unit, for the disassembly, troubleshooting, and reassembly of your mixer, along with all the parts. This is where you’ll find your
Besides your shredded worm gear, you can check for any other unseemly wear and tear on the other gears, etc. You may find more parts that need replacement than just a bad gear. You should also consider replacing the grease, particularly if there are gear particles suspended in it.
Besides needing a replacement gear and grease, you might consider replacing the gasket, too. I recommend using a food-grade grease that you can order online (although I’ve seen automotive bearing grease used too – your call).
As far as parts go, here are five potential vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com; and Grainger.com. You should search for ‘food grade grease’. Prices can vary widely between vendors, so do your comparison shopping.
It can be messy but quite gratifying to diagnose and repair your mixer yourself. Oh and don’t forget to replace the speed control board and associated components, tool
Here are some links to several excellent websites that detail the disassembling/greasing and reassembly of a KA Mixer.

• http://www.artisanbreadbaking.com/discussions/kitchen-aid.htm
• http://www.neilcrockett.com/mixer.htm
• http://www.foodonthefood.com/food_on_the_food/2009/04/how-to-repair-a-kitchenaid-mixer-yourself.html

Between these three websites and their excellent pictures and descriptions and your Parts List manual, you should now be able to completely disassemble and reassemble your mixer.
Good luck and have fun. I hope this helps. Howard, Burke, VA
If this solution has helped you, please rate it. hslincoln