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Author Topic: Hoover Purepower U3456 Autosense - Stripdown and Refurb  (Read 2542 times)

Offline beko1987

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Hoover Purepower U3456 Autosense - Stripdown and Refurb
« on: October 27, 2020, 06:01:32 PM »
Hi!

A fairly long time ago now, I had the pleasure of having a Hoover Purepower in. But not any common old Porepower, the Mk1 Autosense version, sitting here next to the machine it replaced, the Turbopower 2 Autosense




Once home, one of the common purepower issues presented itself as it fell over.

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It's seen some use

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But the hose was not crushed

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The ends unscrew

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And we can start on the machine itself.

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Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!


Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #1 on: October 27, 2020, 06:05:08 PM »
One screw up here

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and one larger one underneath and the handle pulls off

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Behind the handle sits another screw

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Then the bag door can be removed

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The bag door only has one removable item on it, the latch

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Then we can remove the other 2 screws

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And lift the plate off

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The PCB itself is held in with these 2 connectors

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Not too scratched up

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Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #2 on: October 27, 2020, 06:08:59 PM »
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The cover unclips from the PCB

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And the LED cover's pop out

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The power switch is part of the PCB

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Underneath that, it looks like a normal Purepower again

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Snip

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Machine side wires removed

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Flex removed from the other

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Almost as if for this very reason the plastic pegs always snap removing the snap on clips. But it's OK, as there's another one right next to it for re-assembly time...

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Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #3 on: October 27, 2020, 06:12:33 PM »
The bag indicator sensor pops out too

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We can move down now and take the bag out

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And throw it closer towards the bin

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Bag holder time

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The tool holder on the back falls off as you do this as well

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Then the Autosense sensor holder

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Which takes the other tool holder off

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There's the valve that works it all

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And the little microphone/acoustic sensor

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Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #4 on: October 27, 2020, 06:15:34 PM »
The whole assembly pulls out from the dirt port thanks to the dried out glue, and reveals all the crap surrounding the sensor, no wonder it took a while to change the motor speed

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This connecting tube pulls out too

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Then the electrical bit comes out the other way

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Bag door seal was almost off anyway as the wires run behind it to the motor

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Pre motor filter

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Then onto the base

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Height adjuster knob is first to come off

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Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #5 on: October 27, 2020, 06:18:46 PM »
Then the 2 screws at the back allow the hood to lift off too

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Upper hood seal peels off, and the belt route seals pull out

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I do not like this brushroll, but the owner requested it stays as he loves it (and fitted this one to the machine) so we have to live with it...)

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Out it all comes

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We can push the retaining rings out now

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And remove the top half from the bottom

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Mmmm filth

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Height adjustment knob retaining spring removed as itll fall out during washing and I'll loose it forever

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Bottom felt seals removed

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Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #6 on: October 27, 2020, 06:22:29 PM »
Bumper lifts off

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Wheels now! The glamour caps pop off easily

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Then with gentle bending of the soft plastic tabs (which WILL snap if your not careful) the wheels can come off the axles, and the axles withdrawn from the chassis

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These wheels are scrap, and have mega wobble. Their also cracked

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Front wheels lift out, and the tension spring will then fall off

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Some mileage under there

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The height adjustment plate lifts off when the wheels are removed

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Chassis done, it's time to find the motor

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Motor cover off

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Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #7 on: October 27, 2020, 06:25:25 PM »
The air pipe for the bag light comes off now

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Then the motor housing gasket

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Then the motor lifts out

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And we're done!

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Everything got washed, dried, polished and machine buffed and waxed, and then it was time to put it back together

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Much nicer now!

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The fancase seal can go back on the motor

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Then the motor fitted to the machine

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And all the cables and pipes routed nicely

Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #8 on: October 27, 2020, 06:30:24 PM »
Motor cover screws on nicely, making sure the gasket isnt twisted anywhere

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Then it's time for the chassis

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Height adjuster plate and height adjuster knob retaining spring fitted

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Wheels are a lot cleaner

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And can snap in along with the retaining spring

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Time for the wheels...

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Which need replacing with these nice new old stock genuine Hoover ones!

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Which are a bit less used...

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And look amazing when fitted!

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Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #9 on: October 27, 2020, 06:34:09 PM »
It's like fitting a NOS bin onto a DC04/05, just makes such a difference as you realise how many decades it's been since you saw them looking all clean and shiny!

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Bumper can go back on now

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And the felt seals

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Time for a new (used) recline pedal

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Spring in (if you forget this spring you may as well order another recline pedal as they break so easily trying to remove them!)

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And a sound that could be it either snapping in home or snapping off confirms it's in

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Retaining rings positioned for re-assembly

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And if you lower the back part squarely over them they pull up and push in by themselves as you go

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The **** was re-assembled

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Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #10 on: October 27, 2020, 06:37:21 PM »
Along with a new belt

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Which it needed

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Hood time now

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Sealed up

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And dropped on

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It stands up on it's own now!



Nice new pre motor filter set goes in

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And the bag door seal
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Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #11 on: October 27, 2020, 06:40:59 PM »
Time to assemble the autosense sensor now, beginning with pushing the sensor through the housing

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Then fit the tube to the plate, then push the sensor in until it touches the plate end

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Peekaboo. I dread to think how many of these just filled this bit up with fine dust in 6 months and they never worked correctly again!

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The sensor plate snapped nicely back into place, I didn't re-glue it

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And it can be dropped in and screwed to the rear tool holder

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Then the bag holder



Time to get the wiring back together

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Re-fitting all the bits into the lens cover as we need

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Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #12 on: October 27, 2020, 06:44:07 PM »
And it's functional again

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Then the cover plate screws on, and the bag door latch can be pushed in and the bag door fitted once more



I spent some time de-hairing the dusting brush

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And skipped forward a few days now as the hose was not fully dry. I did bin the old post motor filter though





As the replacement had arrived

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Which could be fitted, along with the cover

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Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Offline beko1987

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #13 on: October 27, 2020, 06:47:28 PM »
I applied some wax whilst I waited

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And soon the hose was dry

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It got tooled up



And we're done!



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One lovely Hoover machine refurbished, the owner was super happy with it too which is always nice. I hope one day this helps someone refurbish their own Purepower. Their getting rare, especially the early ones. And their not too bad...
Collector and restorer of vintage vacuums, Dyson Appreciator! Come and see my blog, where I am uploading all my mountains of brochures, manuals and other vacuum cleaner paperwork, and also my youtube channel @beko1987!

Offline MVacs

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Re: Hoover Purepower U3456 Autosense - Stripdown and Refurb
« Reply #14 on: October 28, 2020, 04:32:54 PM »
Nice write up as ever.  :bow:

We still see a few of these come in for small repairs, and still sell a few bags for them.

 

 

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