My Kenwood Chef is about 20 years old.Navy blue and white. When ever the K beater or whisk are put in to use after about 10 seconds the beaters stop turning properly, on releaseing the spring only to find the gadgets fall out

We are FIXYA dot com, we aren't Kenwood Chef, we aren't who you think we are.

There can be two reasons for a Kenwood Chef to run but not turn the beaters. The most likely one is that the Drive belt has broken.

Or

You have strained the beaters and you have sheared the shear pin in the drive shaft. It is there to save you damaging the motor and gearbox.

Take the top cover off

https://www.google.com/search?safe=off&rlz=1C1QJDB_enCA643CA644&sxsrf=ALeKk00zPgmBhh6OuyNypTqtItnqQKaGMw%3A1615571990471&ei=FqxLYIuQHJDQsAW1nJyICw&q=Kenwood+chef+beaters+not+turning

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I have read on other posts that it is the nut at the top of the beater that is causing the problem. You need to rotate it downwards toward the beater in order to have sufficient room to push and rotate the beater out. This didn't work for me, nor did attempting to remove the whole plate by undoing the lug beside the beater insert. Now that I have worn the lug and the nut I cannot get it repaired at a Kenwood service specialist as I have attempted the repair myself.
My advice is to go straight to a professional. Whatever they charge it will be cheaper than being stuck with a machine you can only use some of the time and have to replace!

Repair Kitchenaid Hand Mixer KHM3WH

for both attachments to fall out the planet hub must be worn out. check that there is a spring clip in the groove of the beaters. if you have had it repaired recently it may be running backwards which woluld eject the attachments.

does anyone know how I could get the whisk beaters for a Kenwood A375? Was given mixer but no whisks!!

I couldn't remove the K-Beater as when I tried to turn it the whole mechanism turned with it. I couldn't even remove the splashguard! I was going to take it to the Kenwood factory (a few miles from home) but then I thought I'd give it one more go and this is what I did...

1. Next to where the K-Beater attaches in the middle of the circular plate is a lug with a pointed-shape bolt on the end. Remove this with a spanner and the beater plus gear cog can be removed.
   
2. Place some mole grips or wide pliers on a worktop and sit the cogged gear in to it and grip so that it won't turn.
3. Now you should be able to remove the K-Beater!

Perhaps someone can suggest how to stop it happening again. I haven't attached anything since but will update this post if I have any other helpful tips.

Try turning the beater in the reverse direction to the direction it normally turns - clockwise looking at the beater (I think), this should make the shaft pins ride up on some cams which should release the beater.

It is most probably the nickel plating seperating of the the beater surface unless it is actually hitting the side of the bowl. You may need to replace the beater as it is not good to eat food with metal in it.

Ashburton

You need a new gear set.  Hard to find however.