How to install spring

We are Fixya, we aren't Hoover. You need to contact them direct or take it to a local Vacuum Cleaner repair shop.

There are parts schematics in this link. Parts 30 and 31.

https://www.google.com/search?q=hoover+uh30301+parts+schematic

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All the parts are available. The suppliers will know how easy to replace.

Hoover UH40145B- Windtunnel Vacuum Parts

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Hoover UH40145B- Windtunnel Bagless Upright Vacuum Parts, Accessories, & Repair Schematics. Free Shipping Available - PartsWarehouse.

Hoover WindTunnel Red Bagless Upright UH40145B

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See Hoover-UH40145B parts list. All Johnny Vac's Vacuum Replacement Parts / Pi?ces de remplacement. VACUUM PARTS. Product code : Hoover-UH40145B

Hoover UH40145B WindTunnel Bagless Vacuum Parts

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Need to fix your UH40145B WindTunnel Bagless? Use our part lists, interactive diagrams, accessories and expert repair advice to make your repairs easy.

hoover vacuum cleaner front wheel assy YouTube

Is the belt still intact?
Does it has a wand tool, normally they are connected at the bottom of the machine,if it gets plugged up with gunk, that will greatly reduce your suction.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_54ae41aaaffbab00

Is this what you're looking for?

Also,the manual for your vacuum is available online at http://www.hoover.com/CustomerService/Manuals/Default.aspx.

First, take it outside or to the basement. This can get messy. Turn the vacuum cleaner upside down. Remove four 1-1/2" self-tapping screws that hold the bottom cover in place (where the beater bar is.) Remove this and you will see where the belts go; one from the beater bar to a grooved wheel and one from a bowed wheel to a metal spindle way in the back. The beater bar will lift right out. Be sure to clean the threads and pet hair while you're at it.

install the belt on the motor shaft first by sliding it sideways between the shaft and housing. then install on the brushroll and stretch in place

On this model it is only a single slide adjustment lever. have you trie to tilt the vac backwards (lifting the wieght off the front wheels) and then slide the adjustment lever?

If there is a mechanical issue with it. take the bottom plate and roller out, and then the 2 small screws which hold the cover on underneath. you should be able to see the problem from there

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_b96ba3f038cf317c

There is a spot that sticks up on the holder for the wheels, the hole in the spring goes there, then it fits between the holder and the base asm.

There is a idler wheel that will drive the V belt, sometimes they jam and you just have to reach in, push and make sure if comes in contact with the belt. Alot of times tho it is the other flat belt, 38528035 that will stretch and can cause you to have problems with the brush roll not turning.