Blade Care Guideline

Does the blade assembly have to be replaced?


Blades (the top knives) and/or the assembly (axle, housing, bearing, seals, gear or spline) are parts that WILL wear out, obviously and eventually. How they wear and how quickly depends on what is blended and how frequent. A competitor, in its website “Blender Care & Maintenance Guide” recommends to inspect the blade and blade assembly weekly, while we suggest, for safety reasons, just like you inspect your car’s wheels and tire pressure, inspect every time before a ride. During that inspection you can determine if you need a new blade assembly. We suggest that you always have a new spare blade assembly on hand. It will help you compare between good and bad.


  • Check for nicks, cracks, [the knives unusually abnormally appearing or bent further than what is from factory– you can compare your blade with a new one] or gouges in the outer surface [on the blade]. If any are present, replace.
  • Inspect the blade assembly gear for signs of wear. The teeth of the gear should be deep and have continuous edges.
  • Inspect the bottom of the blade assembly below the gear. If you see that any part of the seal is torn, missing, or lifting, replace the blade assembly.
  • Rotate the blade by hand, feeling for smooth, consistent, light resistance. Please note, a brand new blade usually shows more resistance which will loosen a little time after beginning to use the blade assembly.
  • Place the gear of the blade assembly between your index finger and thumb and push up and down (vertically) on the gear. If any vertical movement is detected, replace the blade assembly immediately.
  • Inspect the silicon rubber seals from top to bottom. These are visible shaft seals. Check for cracks, missing pieces, loose fragments. In any defective condition, replace the blade assembly immediately.


In short, the blade assembly should be replaced if it:


  • “Pinwheels” or rotates freely and effortlessly like a pinwheel in the wind
  • Does not spin or is difficult to spin by hand (not to be confused as factory-new spin, which tends to be smooth, even, but sometimes a little slow(er).
  • Makes an audible grinding noise when spinning.
  • Has vertical movement
  • Has side-to-side movement
  • Ball bearings are visible where the seal should normally be located
  • The blade / knife shows discoloration, nicks, bends, gouges in the outer surface of the knife, or any slight bend upward.

 If not sure, call us and we gladly troubleshoot it with you. Better be safe!


What can happen if a blade assembly is in need to be changed but is not changed?


  • The motor could be damaged, not likely but possible
  • The knife could potentially break - not likely but possible - (this could lead to damage of the jar, or break it, and/or even cause injury) We have never been able to create an actual break ourselves. This is a hypothetical precautionary warning.
  • The drive socket on your blender can strip out (it is replaceable though)
  • You cannot blend your smoothie very well and you get all upset for the rest of your day because you didn’t have your heavy dose of fiber and nutrients.


Make-sense … Who is responsible to inspect their blade assembly?

  • The blender users are responsible to inspect their blender, blade, blade assembly and jar


How [else] can you damage your jar and/or your blade assembly or blade/knife? Let’s rephrase this question: “How can the blade assembly possibly and/or even be damaged?”


  • If you stick stuff aka ingredients into your container and blend it, other than normal foods.
  • Blending metal – steel (spoon, fork, kitchen knife...etc), stones, cement, sand, IPods, anything that is not edible
  • Sticking in your tamper to far so it touches the blade during operation
  • Sticking in your jar and/or using objects other than a tamper properly inserted into the jar for whatever reason.
  • Blending frequency and variability of ingredient hardness and length of blending cycle, in combination with a previous event of having somehow operated the blender and/or used the jar and blade in a manner that may have caused the blade to slightly bend, get a nick or gouge.
  • Using dishwasher to clean your jar and blades and leaving the jar sit in a water puddle


How Do I extend the life of my blade assembly and blade?

  • Inspect as explained above
  • blend only ingredients appropriate to the purpose and our intent for which the jar and blades are made and sold.
  • the softer the ingredients are that are blended, the more likely the blade and blade assembly and the jar will last. Harder is worse
  • blending less watery concoctions
  • don't wash inside the dishwasher.
  • instead of letting the jar drip, hand-dry with a towel and store up-right instead of up-side down
  • never leave in the sink in a water puddle, or don't store water in the jar
  • don't use the jar as a planter-watering jug or serving drinks in on.
  • Always immediately right after you have completed the blending, pour the content out and then rinse right away, and dry right away by hand.
  • Use soft non-corse chemicals or detergent for washing
  • Be aware of the sharp blades - don't cut yourself.
  • for extended storage, put the jar on top of the blender (empty with lid in place) and with the motor turn the blade for 30+ seconds. The heat inside the bearing housing will evaporate any water, if there is some in it- to prevent rust since the ball bearings are not stainless steel - they are more durable that way.




We are making replacement blades easily available and they are very inexpensive. We recommend to take advantage of our package discount deals on our website to buy spare blades for $19 when you buy your jar. The first year (consumer user application), we even replace the blade assembly for free – see warranty (Commercial application varies). Blades definitely wear out, and they do need to be replaced. The only and the best judge to decide if and/or when the blade assembly needs to be replaced in order to be able to safely and effectively continue blending and  to prevent further damage, a blade knife breakage, and/or even injury, is the user.


The length of Warranty does not imply the length of how long blades should last in good and safe working condition. We, 123Vita LLC, aka Alterna Jar LLC, are not responsible or liable for blade wear and tear and/or any jar breakage, damage, and/or injury. You are using our product at your own risk and judgement. We are placing links of this Blade Education page on every product page; we have it in blogs, we send out newsletters at least once a month, and we even refer to our warranty and user and liability disclaimer information every time we send out our products (jars).


If for some reason you cannot change the blade assembly when it needs to be changed or should be changed, and/or no replacement is available to you at that moment, DO NOT USE the Blender, Jar, Blades installed, until you have the opportunity to change the blade assembly. Only complete blade assemblies are available. We cannot guarantee that we always have replacement blade inventory.


Keep blender and jar away from children. Or, better yet, keep the children away from the blender and the jar and the area where you blend. The knives / blades are sharp. Never insert a hand into the jar during blending. Always hold the jar in place during blending..


Alterna Jar LLC