Hslincoln wrote , " I believe the ‘knob’ that you’re referring to on the agitator shaft (rotating column) is called a ‘groove pin’, and you should be able to replace it yourself. "
I think I need to replace the whole column, not just the groove pin. Can you tell me how to do that--if it's possible?
Hi ALLENJUJU. To replace the agitator shaft will require a significant amount of extra effort, but will be well worth it in terms of gratification and reward for being able to successfully do it yourself. First, I’ll assume your mixer is no longer under warranty. Second, I’ll assume you have your Repair Parts 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 use KSM50P (Your K5SS mixer falls within this manual), and select the first file KSM50P.pdf (438.31 KB) listed under Parts List (4) and then check to verify this matches your mixer model.
Turn to pages 4 & 5, titled: “Case Gearing And Planetary Unit” which shows you an exploded view of all the mechanical parts and assemblies for your mixer.
I highly recommend the following website that provides you step by step instructions with pictures (worth every bit of a 1000 words) to gain access to your planetary housing and agitator shaft. The mixer displayed is a different model (tilt-up) than yours, but the ‘insides’ are the same.
It would be helpful to have the following tools available as you begin to disassemble your mixer: a flat screw driver, a small Phillips screw driver or a punch drive, a pair of retaining clip/ring pliers, and a hammer.
You will need to remove the Planetary Drip Ring (Illus. No. 42) and Pin (Illus No. 25), which secures the Planetary Housing (Illus. No. 33) to the Center Vertical Shaft (Illus. No 19). (See pictures 6, 7 & 10, 11 from the link).
You’ll need the punch drive or small screw driver with a smaller diameter than the pin, a hammer, steady hands and plenty of patience. Rotate the planetary housing to expose the retaining pin with the vertical (center) shaft.
After removing the Planetary Housing, remove all the residual grease from the 18 tooth Agitator Shaft Pinion Gear (Illus. No. 47), which should expose a Retaining Clip (Illus. No. 61), which will need to be removed. With the Retaining clip removed, the pinion gear and Shim Washer (Illus No. 45) should easily slide off the top of the agitator shaft and you should be able to pull the agitator shaft down through the planetary housing bushing.
Take your new, replacement agitator shaft (be sure you’ve got the lower groove pin ordered, too, and insert through the bottom Planetary bushing. Replace the shim washer, 18 T Pinion Gear and Retaining Ring. Grease up the whole works with new grease, and reassemble the opposite of how you took it apart.
Here are five potential online vendors in no particular order: RepairClinic.com; mendingshed.com; searspartsdirect.com; partstore.com; and Grainger.com (for grease). You should search for ‘food grade grease’ online (although I’ve seen automotive bearing grease used too – your call). Prices can vary widely between vendors, so do some comparison shopping.
I hope this helps - hslincoln, Burke, VA
If this solution has been helpful, please rate it, thanks! hslincoln
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