My beater brush comes on for 3 seconds and quits working on my shark navigator.

They are all called 'Navigator' :>D
https://www.google.com/search?q=Shark+Navigator

When switch to carpet, the difference is that the brush roller turns. When it is on hard floors setting it doesn't. Remove the base plate, remove the brush and the belt. There is likely something wrapped around the drive spindle or clutch.

How to reduce high pitch noise of Shark vacuums

Digital Trends https://www.digitaltrends.com > Smart Home > Guides
Apr 6, 2022 - You can adjust the height on a Shark vac to accommodate certain levels of rugs, carpet, etc. If the vac has been set too high for the current ...

Loud rotating carpet brush noise: Just got my new Shark

Fixya https://www.fixya.com > support > t15932203-loud_r...
It seems that your drive belt for the beater brush is stretched. This is a common problem -- if you flip the vacuum over so you are looking at the bottom, you ...

4 Reasons Why Shark Vacuum Is Making Noise

howtofixit.net https://howtofixit.net > shark-vacuum-making-noise
Aug 20, 2021 - Another cause behind the loud noises coming from your Shark vacuum is an overly dirty or damaged filter. Remember: air must be able to pass ...

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HI, it's Jim from Crucial Vacuum!

If your Shark Navigator vacuum is only making a strange noise when the brush roll is turning then the two things to consider and examine would be the brush roll itself as well as the belt.

First off lets look at the brush roll itself. Right off the bat is there any noticeable debris caught in it? You're mainly looking for long carpet fibers, or even strands of hair? If so try using a scissor to cut the blockage away. Then, manually rotate the brush roll to uncover further clogs. When examining your brush roll take note of the condition of the bristles. Are they loose? If so this would be a good time to change your brush roll entirely. There should be two screws holding the plate onto your Shark Navigator. Use a screw driver to remove these screws to gain access to the brush roll and belt.

The second part to check would be your Shark Navigator's belt. With use the belt will stretch out, lessening the tension on the brush roll. Lesser tension diminishes the brush roller's turn rate and speed. So if your belt feels loose as well replace that. A general rule would be that you're going to want to replace your belt about every 6 months. And if your belt is really loose this could be causing a noise when your brush roll is active.

You can purchase your replacement parts for your Shark Navigator direct from Crucial Vacuum with free shipping and an exclusive 10% coupon for Fixya.com readers, use code: FIXYA10

http://www.crucialvacuum.com/catalogsearch/result/?q=Shark+Navigator&limit=all

I hope this was helpful. If you would like further assistance, please feel free to give us a call at 877.750.9239. We have helpful and friendly customer care representatives on the line ready to assist you.

Jim Thompson
Crucial Vacuum Customer Care
http://www.crucialvacuum.com

Sharks are not made to be repaired. They are built to throw away. No parts are made for them for this reason. Save yourself some grief and don't buy another one.

Got threads the end bearings. Try a pear of needle-nose to pull them out.

Maybe not the same issue, but my roller brush would only work intermittently. I had to take apart the main housing and clean the two contacts (female side) that connect to the lower brush assembly. Now it works like new.

There not one. Call cust. service. There help you.

It seems that your drive belt for the beater brush is stretched. This is a common problem -- if you flip the vacuum over so you are looking at the bottom, you should see several screws holding a faceplate in place. Unscrew these, and you should be able to get access to the beater brush and belt. Pull on the belt a little -- if it has a lot of give, or seems stretched or cracked, replace the belt and your vacuum should be fine. If it is not stretched or cracked, move the belt and look between the belt and where it holds onto the brush (there should be a little groove that the belt is sitting it). If there is a lot of debris or hair (I have long hair and this happens to me quite often) between the belt and the brush bar, clean it out, and you should be good. The squeaking noise leads me to believe that the belt is stretched and could be replaced.

check the belt it sounds like its broke take the bottom off where the brush is and there should b a belt that drives the brush