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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.
Get A Copy of the Repair Parts List for your model at Kitchenaid.com.
Remove the Gearcase Motor Housing (1) & the Transmission Housing (7)
Remove the 2 screws (23) holding down the Motor (2) and lift off way from
the Worm Gear (17). Test run the motor by itself at different speeds.
If it runs fine then it's time to inspect all the gears in the Transmission
Housing(7). Remove all the brown Grease covering the gears.
Pay attention in particular to the teeth of the Worm Follower Gear (19).
(the Bevel Gear (21) sits on top of this gear)
They should not be worn out or chipped. If they are then this is the source
of the noises you're hearing (the Worm Gear is grinding away the teeth of
the Worm Follower Gear). Once the Follower is replaced, your mixer will
be just as new again.
Please Note that this replacement is not an easy task. You need the right
tools and don't use a hard object like a steel screwdriver to pry out the
Planetary plate (15) from the beater shaft. Before re-assembly, use only
fresh new Food Grade Grease from Kitchenaid (the old grease may contain
metal filings from the worn out gear that will damage your new one)
There are two motor brushes, one on each side of the Motor Housing.
Both must be in contact with the motor coils. If they are too worn out
and/or improperly installed, the motor will not run. Unscrew the black
plastic caps and remove both Brush and Spring Assemblies. Notice
that the brushes are keyed (i.e. one corner is not square) and are
designed to go in the motor housing only one way, in order to make
contact with the motor coils. You can clearly see this if you have the
housing off, whether or not the brushes come in contact with the motor.
Hi DAVE, Merry Christmas & Happy New Year! 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: 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 the purpose of this solution I will use the 5 Series Parts manual. Substitute accordingly if you have a 4 Series model.) Turn to pages 4 & 5, titled “Case, Gearing and Planetary Unit”, which provides and exploded view for the disassembly and reassembly of your mixer, along with all the parts. (1)Remove your KA Decorative Trim Band (Illus No. 3) by removing one (1) screw (Illus No. 22). (2)Remove the four (4) head cover screws (Illus No 14) and lift of the mixer head cover (Gearcase Motor Housing top, Illus No. 1). (3)Next, remove the two (2) screws (Illus. No. 14) securing your (Speed) Control Assembly (Ilus. No. 19) so you can move the Control Assembly out of the way.This will allow you better access to the Transmission Housing (Illus. No. 4). (4)Remove the four (4) Transmission Housing screws (Illus. No. 14). Carefully lift the Transmission Housing off the base.The Transmission Cover Gasket (Illus. No. 6) may come off with the Hosuing or remain on the base. (Recommend reorderinga new gasket if damaged) (5)Remove all grease from inside the transmission cover and off all your gears.(This is the messy/fun part. While cleaning away the current grease, be sure to be keep and eye out for metal ‘filings’ that may be suspended in the grease. (6)Remove the Worm Gear drive assembly (Illus. Nos. 16, 17, and 18) and set aside. (7)Remove Retaining Clip (Illus. No. 7) from the Planetary shaft. (8)Remove (lift up) the Bevel Gear (Illus. No. 8) from the Planetary shaft. This may require a little friendly persuasion, but it should eventually slide off the shaft exposing the Retaining Pin (Illus. No. 9). (9)Remove the Retaining Pin. It should come out easily in either direction. (10)You can remove the Worm Gear Follower (Illus. No. 10) but once the retaining pin is removed, you should be able to push the Planetary Assembly (Illus. No. 28) down through the Lower Center Bearing (Illus. No. 12).A few taps with a soft faced mallet may be required. You now have access to the Planetary gear and Agitator Shaft Assembly (Illus. No. 34).Apply the same techniques to remove/replace any components from the Agitator shaft. Assemble in reverse order above. Continued in "Comments" - hslincoln
Hi. Remove the top cover and look for the plastic transmission housing, it's toward the front of the machine. Look for cracks in this housing. If the housing is cracked, remove it and look for further damage to the worm gear assembly and the bearings and bearing seats that support them. You'll have to remove some of the grease to inspect the parts. If you're lucky, only the trans. housing will need replacement. If, like me, you're not so lucky, you may have to replace the housing, wormgear assembly, bearings and re-work the bearing seats so that the new bearings fit properly. Although Kitchenaid advertises that their mixers can easily handle bread dough, the truth is...They can't. This scenario happened to me and I had to replace all of the above. Be prepared to wait a month or more before your parts arrive. Specify that you want the METAL trans. housing. I'm still waiting (6 wks.), for a single bearing. If this solution works for you, please rate my solution. Good Luck! ricardok45