Replace the potentiometer with a better one. Do not use the CHEAP PIECE OF [email protected] that comes with the blender. For what they charge for these machines, they should be using MUCH better components. I used part RV4N502C-ND from Digi-key as described by another poster for a different model. The knob didn't fit, so I also used Mouser part #5164-1500 knob, which look exactly the same.
It will probably just need the pot replacing, take note of where the wires go. I see someone else here is doing the same job and wants to know where to put them back. Take a photo first saves a lot of grief. The pot is the rotary resistance switch behind the knob.
Hi there. I know you were looking for an answer 5 months ago. I didn't see the correct procedure listed. My speed control just bit the dust. Anyway, here goes: Pull off the rubber cover where the container sits. You'll see 4 phillips screws, unscrew them (you can leave them in place). Next, on the black drive wheel in the center, look to find a small triangle molded into the outside of the ring. Line it up with a small slotted opening just under the drive wheel. Use a small allen wrench which fits in and unscrews a set screw. You can lift off the drive wheel. Now you have to pull the top off. On mine, it took some time as I was trying to be careful not to break anything. With persistence the top will separate from the base. My super 5000 has a 2 wire speed control knob. Hope this helps if you haven't gotten an answer elsewhere or taken it to the shop.
What has worked very well for me in the past in similar situations (not with kitchen appliances but any older item needing a part) is find people selling the item or parts for the item on eBay, and then messaging them asking if they have a source for whatever it is I am looking for.
Almost always this leads to what I need, whether it is for a camera or an old watch or a vintage computer or whatever.
Messaging through eBay is easy, fast, and free.
Simply type Vitamix 4000 in the Search box, and get the listings displayed, and then click on Contact Seller.
eBay will send the message, and notify you when there is a reply.
Rating: 4.7 - 249 reviews
Shop Vitamix at the Amazon Small Appliance Parts & Accessories store. ... blender on the fritz, PLEASE do yourself a favor and check the old drive socket before buying a whole new blender. .... This fitted perfectly into my vitamix super 5000.