Dyson motor making high pitched noise. Is this

Replacing the brushroll and belt usually takes care of it unless the motor is bad. Remove the belt tensioner. Only a few models had it and Dyson determined it isn't needed.

Probably the brush bearing. Consider changing the brush assembly

Not sure if this will help but mine sometimes make a loud noise as well and its usually due to hairs stuck UNDER the belt in the motor area. Get some sharp skinny scissors and long skinny pliers and get under that belt, cut the hairs and use the pliers to pull out those hairs. That noise is usually because too much hairs stuck under the thing that turns the belt and the belt cant spin so it makes a lot of noise. When i do this it solves the problem of noise, but eventually hairs will collect in there again and make the noise again so i just take the hairs out again and problem solved.

It is probably the brush roll motor making the noise. Remove the brush roll & belt and turn both motors on. If you do not hear the noise when both motors are running the noise is likely coming from the brush roll

Hi Liz,

I'm sorry to hear that you're concerned about the noise your DC17 is making. It will be difficult for us to help without hearing the noise, so it's probably best if you get in touch with us directly. One of our Helpline experts will be able to determine the cause of the issue, and will be able to recommend the best course of action.

You can call us free on 1866MYDYSON, or email [email protected]. We'll look forward to hearing from you.

Kind regards,

Jack
Dyson Online Customer Support

Hi there,

Sorry to hear you're having difficulties with your DC17 Animal. You might find it helpful to check that the brushbar is free of threads, hair, or anything else which might be obstructing it - the easiest way to do this is to follow the steps shown in our online support guide:

http://www.dyson.com/support/help.asp?article=961&product=DC17-ANIMAL

If the brushbar appears to be free of obstructions, but continues to make an unusual noise, it's probably best if you get in touch with us directly so one of our experts can provide further assistance. You can call us free on 1866MYDYSON - or if you email your details to [email protected], someone will be in contact with you as soon as possible.

Kind regards,

Jack
Dyson Customer Service

the high pitched whining is most likely the belt and it stops when you put the handle up because the roller bar is not engaged when you put up the handle.If it is the belt making that noise it will most likely break soon and you will need to put a new one on. Hope this helped...good luck

You need to replace the belt. You can get replacement belts here:

DC14 Belts

clean out suction tubes ther is something caught in them

might be the motor burning out. or it needs a new fan.