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The Nutri Ninja is a personal blender by Ninja Kitchen. This blender has no buttons: it starts blending when you insert the cup into the base. It is 900 watts.

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Why does the blender get loud and smell?

The blender started being much louder and there is a burning smell coming out of the base. Where should I start if I want to fix it?

Should I order any parts? Or can I just maybe grease it somewhere?

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I have a Ninja BL685 that emits an odor when mixing smoothies. How do I FIX?

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tengo el mismo problema, la compre hace tres meses

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I bought a brand new blender and I get the burning smell. Had the same thing with the last one. I know they sometimes smell because they are new. But that shouldn't last

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So I took a gamble…I put about a half a cup of water in the cup and about a quarter of a cup of olive oil. I blended the mixture for a few seconds. The olive oil released the black gook that was inside the blade mechanism. I then rinsed the blade and dried it and blended the olive oil and water again. The olive oil completely lubricated the blade mechanism. It's no longer stiff and moves freely nor is there smoking or high pitch sound. Olive oil is water soluble so even if I get some in my smoothie it's not harmful. Moral of the story is I think there is a way to lubricate the blades without having to take them apart. Just like you would put olive oil in your baking pans to lubricate them the blade mechanism need it too.

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Legendary suggestion!

I was thinking I had a motor burnout with the smell.

Your tip seems to make it quieter & NO smell.

THANK YOU!!

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@hornikmartin those blenders really do not use any amount of grease etc. I suggest that you take it apart using these guides Nutri Ninja BL450 Repair Then check the bearing on the motor and check for any visible damage. You can always post some images of what you find with your question. That way we can see what you see. Use this guide 在已经存在的问题里加入图片 for that

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I have gone through 3 blade assemblies now and I have become an expert and identifying the cause and result of this one issue.

Indicators to this issue:

  1. Noise of machine changes from spinning to a “free spinning” sound which is significantly louder
  2. plastic burning smell emitted
  3. Chunks of plastic remain in the engine base docking area.
  4. Brown liquid in the base area
  5. If all of these are happening then the cause is that your blade was probably submerged in water at some time with heat. This has popped the seal on the bearing case and the lubricant has leaked and now the bearing is rusting and can’t handle the heat being generated from the speed of rotation.
  6. The test is to blend a water only smoothie and see if the water changes colour to a dirty brown, if so the bearing seal is gone and the water + rust is leeching into the smoothie.

Stop use immediately buy a new blade assembly.

Learnings:

don’t put the blade in the dishwasher - the rapid heating and cooling breaches the bearing seal.

don’t submerge or leave submerged the blade assembly

Verdict - the blade assembly is not a well constructed part considering it’s high speed use and need for bearing integrity. It is very susceptible to damage and water ingress.

That’s what I’ve found

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Everything you described is what has happened to my ninja blade. And this is my second one to get damaged. I don’t recall submerging it in water because I try to wash it as soon as I’m done making my smoothie. But I guess it’s possible if it happened as I washed my dishes and it sat in the sink. Or when someone else washed the blade for me while I was busy. Now I know what to do and hopefully this next blade will last much longer. And speaking of longevity, how long should the average ninja blade last? Does anyone know? And my final question: Do I need to worry about my ninja blender base having any damage because of this issue? The first time this happened, I threw out the base and bought a whole new set which is my current one. Thanks for any help/advice on this topic. This website is super helpful!

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I had a similar failure, but I don't think it was caused by heat. I think it happened because I overfilled the cup, not leaving enough airspace, and the pressure from blending forced liquid past the seal.

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Hi Jono, thanks for the info - this is exactly what has happened to mine. Could I just check though that I completely understand? I basically can't use the smoothie jugs any more because of the screeching sound. I replaced the blade a couple of months ago and it was ok for a bit, then started back up again. Both the food processor and blender jugs work fine, it's just the smoothie jugs. I had the issue you described - a lot of black grease coming out, bits of black plastic leftover and a burning smell. What can I do to be able to use these parts again? When you say blade assembly, do you mean the blade that screws into the smoothie jug? If so, replacing it only temporarily helped. Anything else that might work?

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My Ninja base with the blade assembly did this. Apparently food must get caught in the mechanism. I soak the blade assembly in hot water with vinegar occasionally. The blade moves easier and spins better now.

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This was so helpful! Thank you, seems to be doing the trick!!

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I'm going to try this. Would be great if that's all I need to do. We clean the blade assembly every time we use it...which is daily, but some areas aren't easy to clean and don't even look dirty. So maybe, just maybe this is the answer I'm looking for.

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might be a dumb question. Which part is the assembly.

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I just did this. Took out the rubber O ring. It was gross. I did what korems above did. Cleaned it, soaked the blade assembly in hot water with vinegar and when it’s dry in the morning, I’ll put it back in and try it again. If I still smell that burning smell, I’ll prob order a new one. That makes me nervous.

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Did it work?

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The smell was awful and I thought I'd try something before it either burned up the motor or I had to pay$30 to replace the blade mechanism. It didn't spin like it should and was taxing the motor. I took the o-ring out from between the edge to clean it (gross!) then soaked the entire thing in hot vinegar water. Now if you hold the black edge, you can spin the blade easily. Fixed !

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Submerging it in water didn't break it? I am worried that after soaking it, it will not work right.

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No just the blade mechanism, not the motorized part.

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Mine doing the same thing...when I turn the blade base over there is grease. It looks like it is spinning out it's lubrication. Fixable?

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Mine sounds horrible. I can’t find an o ring. Can you explain where the o ring is? Thanks!

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I put hot water and fairy liquid in the cup, added the blender lid and let it soak upside down. Then cleaned around the place where the blades meet the metal shaft. Then replaced the water with vinegar (as suggested above) and let soak for half an hour. Then I blended with the vinegar in for a few seconds. Finally scraped out whatever gunk I could from around the metal join and washed. Works perfectly now.

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Thank you to all above who posted ideas on how to fix it. I had the same issue, burning smell and even smoke. My issue was that the blades were kind of stuck. I filled a cup with water and vinegar as other recommended and let it sit for 8 hrs (the mix was in contact with the blades), then I took the blade part and turn it and filled it with water and vinegar (I filled the part in between the 2 circles) left it for some hours and boom! It is working perfectly now, no burning smell, no smoke. I guess food gets caught in between the blades and its support.

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So I took a gamble…I put about a half a cup of water in the cup and about a quarter of a cup of olive oil. I blended the mixture for a few seconds. The olive oil released the black gook that was inside the blade mechanism. I then rinsed the blade and dried it and blended the olive oil and water again. The olive oil completely lubricated the blade mechanism. It's no longer stiff and moves freely nor is there smoking or high pitch sound. Olive oil is water soluble so even if I get some in my smoothie it's not harmful. Moral of the story is I think there is a way to lubricate the blades without having to take them apart. Just like you would put olive oil in your baking pans to lubricate them the blade mechanism need it too.

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Cheap plastic components = noise smelly garbage.

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how do you take apart the ninja chef blender blade assembly?

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How do you take apart ninja chef blade assembly?

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I didn't need to take it apart.

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Hi all- so many suggestions so I’m confused where to start- I’ve noticed a high pitched screeching the last few times I used mine (nutri ninja), and just now it started smelling like something was burning. When I touched the under-side of the blade (not the metal part, the black circle on the other side of the blade lid that is in contact with the base while blending) it felt hot. What should I do? So scared it’s going to smoke or catch fire!

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Shira, same thing happened to me. This is how I fixed it: I filled the cup with water and white vinegar, closed it with the blade and let it sit overnight. then I took the blade base, flipped it over (blades down) and filled the space ring (between exterior circumference and black circle -that yo mention was hot-) with water and vinegar, let it sit for 8 hours. And then the smell was gone. Looks like food gets between the blades and they get stuck which produces the burning smell. I clean it like that every month or so.

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Mine was smelling like it was burnt to but instead of. Blending the oil, i poured oil on the bottom of the base of the blade and let it soak and started to spin it by hand until it spun easy. Then i cleaned the oil off and spun a full cup of water now its fixed.

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