Blender blades do not turn when under load, but run smoothly when empty container It is a Vitamix 6300 model

SOURCE: KITCHENAIDE BLENDER

sounds like you engage gogs under you canister are slipping or wore out lift up your canister to check them. not sure if your particular model has set screws in them or not look and see might be it hope this helps

SOURCE: blender turns off

I work for Black & Decker appliances and have more than 10 years experience with small appliances.

Anytime you smell something burning while using an appliance that isn't suppose to heat food, something is wrong. You shouldn't smell any foul odors emanating from a blender. The fact that it shuts off while pureeing something as simple as oatmeal indicates that particular blender is defective.

If you contact the manufacture they will be able to inform you as to your warranty eligibility.

I hope I've provided you useful assistance and that this information allows you to make an informed decision as to how to proceed from here. Please be sure to vote on my response. I hope I've earned a good rating from you today.

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SOURCE: blades need to be greased, but I don't know what

To take the blades off, grab the blades with a rag so you don't cut yourself, then grab the other end with a rag and turn CLOCKWISE - it's reverse threaded, so lefty loosey doesn't work here, it's lefty tighty, so turn to the right. Figured it out after an hour of mental anguish

SOURCE: ninja blender blade wont turn with food in container.

make sure blade is pressed tightly onto shaft... should click into indent. if not then you need a new blade piece.- stripped

SOURCE: My wolfgang puck 1.6 hp professional blender will not spin the blades if there is anything in the blender container.

This is not really the solution it is just a better description of the problem that I am also having. This is a great blender however the part where the cup blades conect to the motor is made of plastic.
So what has happened here is that the motor is fine, the cup is fine only the plastic part that makes the motor turn the blades has worn down therefore rendering the blender useless. I would like to know where I could get this small part to change on my blender!!!