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Author Topic: Vax Mach Air U91 Stripdown and Refurb  (Read 2512 times)

Online beko1987

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Vax Mach Air U91 Stripdown and Refurb
« on: November 04, 2016, 12:09:09 AM »
Hello! Sorry I've been a bit quiet, life has been up, down and busy lately, and I've been tinkering in the background, but haven't honestly had time to write any rebuild threads!

Until tonight, and I thought I would start with the Vax Mach Air. I bought this for 5 from facebook, and initially things weren't great with it

<a href="https://www.youtube.com/watch?v=4BISxGHsN2k" target="_blank">https://www.youtube.com/watch?v=4BISxGHsN2k</a>

But a quick unblock of the filter had it fighting fit

<a href="https://www.youtube.com/watch?v=GI7snL5fQks" target="_blank">https://www.youtube.com/watch?v=GI7snL5fQks</a>

Much better! Let's have it apart

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The wand/handle comes off first

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This orange end cap pops off

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and the adjuster mechanism started off well

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but it quickly became apparent that it wasn't coming apart, so I left it be.

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The other small part of the wand comes off, and that's about it!

Cyclone off

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Cord off

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To remove the hose, 2 screws need to be removed from here

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and this screw here to release the hose at the bottom

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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!

Online beko1987

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #1 on: November 04, 2016, 12:14:04 AM »
The end of the hose pops off, and the seal comes off too

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Switches now, there are 2 screws on the front

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Next (as I found out, those screws aren't the only ones, so you could do this first) pop out the switch covers and remove them and the springs

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And the 3rd screw reveals itself

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Some gentle levering releases a small catch and the housing separates

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At this stage I removed the handle lock (it was easier to take a photo of it like this!)

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and the spring bit

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The switch housing lifts off now

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Revealing the main power and brushroll switch

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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!

Online beko1987

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #2 on: November 04, 2016, 12:18:00 AM »
The switches lift out now

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and unplug

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Had to chop this crimp off to get the wires out

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and the mains cable is gone

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The spinal cord can be pulled out now

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This tool holder can be unscrewed if you like

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2 screws sit at the base of the spine

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and the spine lifts off

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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!


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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #3 on: November 04, 2016, 12:28:43 AM »
This is easier to photograph now!

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Time to lie down

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Now someone explained to me on a comment how to split the machine, so thank you MadAboutHoovers from the first youtube video, I took heed!

Pop the centre caps off the wheels, and the wheels fall off

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But, some of the screws were hidden, so a different approach is needed.

Back to the top, brushroll cover off

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The orange PCB cover unscrews next

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and removed the little LED lens

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This is the PCB inside the brushroll housing

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Next, time to go back underneath to remove the screws holding the middle housing in place. You will see most of the screws here

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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!

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #4 on: November 04, 2016, 12:37:24 AM »
there is a screw either side here behind the wheels

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and one hiding under the ratings sticker

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With all that undone, turn the machine back over, we need to look at wires

This is the main power feed to the PCB, remove the cable clamp

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and undo the terminals to remove the wires

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Remove the power wires to the brushroll motor from the other side

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There's a date of 09/09-2010 on the PCB, my 23nd birthday!

With the wires removed, and the screws removed, the housing can lift off the lower chassis

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With the middle layer removed, the pivot screws become visible now



and within one side of the pivot point is the brushroll motor micro switch

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With the microswitch and reset switch removed the PCB lifts out now

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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!

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #5 on: November 04, 2016, 12:45:11 AM »
The suction channels are formed with both sides of the housing, and it runs around the edges.

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The 2 halves can be removed from each other now

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Brushroll motor out now

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The supporting bracket unscrews

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Motor data

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Brushroll out

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End caps off

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and clean up the brushroll

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The 2 clips that hold the see through cover on snap off

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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!

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #6 on: November 04, 2016, 12:48:52 AM »
The front wheels pop out

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The hose inlet for the floor suction is an adapter that screws on

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This metal bracket locks the machine upright, and provides enough resistance to keep it there

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Onto the motor now

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Post motor filter and cover off

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The lower hose guide ring has another screw, which is on the top of the motor housing

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and some screws later

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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!

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #7 on: November 04, 2016, 12:56:51 AM »
There is a diffuser that sits on top of the motor, and the 2 rubbers that locate the motor into the housing are also seen

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3 more sodding crimps to remove

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This allows the motor to be removed

The foam sound deadening pulls off the motor

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Motor data

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Within the motor housing, the fancase seal can be removed

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The thermal cutout sits behind the motor



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The spinal cord comes in from the top via a clamp

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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!


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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #8 on: November 04, 2016, 01:02:39 AM »
and a second small cable goes out of the motor housing, around the back of the housing and through the pivot point onwards to the PCB

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The suction channels awkwardly screws onto the back of the motor housing

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this highlights the cheap spray finish applied to this machine, which explains why it looks so shit when it scratches up

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Getting there now, time for the cyclone!



With the lid off, we see 2 screws

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Which releases the handle and release button with its spring

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The release valve clips on from underneath

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Onto the other end, at the end of the cyclone 'cone' is a rubber seal

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The cyclone to bin seal slips off the top

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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!

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #9 on: November 04, 2016, 01:07:13 AM »
To split the cyclone further we have to remove lots of screws

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which reveals the top of the cones

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The cyclone seal is built into the top

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To separate the cone and shroud, this locking ring needs to be rotated

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The shroud just lifts off

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The cone can be removed from the top part by these blurry screws

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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!

Online beko1987

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #10 on: November 04, 2016, 01:11:06 AM »
The bin flap pops off it's pivot points

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and the bin flap seal pulls off

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The release latch pops off

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and it's finally apart!

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Vax do like their screws



and after a day or two it was all washed, dried and polished

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and in reverse order, it's time to re-assemble it! Bin latch on

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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!

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #11 on: November 04, 2016, 01:14:53 AM »
The bin flap seal is fitted

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and the flap itself is popped on

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Cone/shroud now

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The cone top and cone bottom are keyed, and there is a tab to line up

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Fit the screws

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Lower the shroud onto the cone

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and fit the locking ring

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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!

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #12 on: November 04, 2016, 01:18:34 AM »
Fit the top seal

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and do up all the screws. The very top part is keyed the same as the middle part, where the center screw goes.

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Fit the tip top seal

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Fit the bin to the cyclone

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Refit the release valve

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Assemble the cyclone handle

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and fit it



Moving on, fit the suction channel spider bit to the motor housing

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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!

Online beko1987

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #13 on: November 04, 2016, 01:26:48 AM »
Fit both halves of the spinal wire. This caught me out, the wires are a different thickness, so will only fit one way. Strip the ends cut earlier in readiness for new crimps

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Lay the motor down next to it

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Find your crimps

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fit the thermal cutout and crimp all the wires back together

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Fit the motor foams and rubber locating pegs, and fit the motor to the housing

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and screw the 2 halves together

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fit the post filter

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Add that to the done pile

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Onto the brushroll part now. Fit the metal bracket

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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!

Online beko1987

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Re: Vax Mach Air U91 Stripdown and Refurb
« Reply #14 on: November 04, 2016, 01:31:17 AM »
Fit the hose inlet

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then the front wheels

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then the brushroll cover catches

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Pop the end caps on the brushroll, slip the belt on and fit it all to the housing

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Fit the brushroll motor

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Lower the motor housing onto the brushroll housing

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and with 3 hands, fit the micro switch, and reset switch with it's cover (it all just about stays still if you're careful)

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But with the pivot covers fitted holds itself. Don't forget to feed the cable through the LH one.

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Fit the top housing on now, feeding all the wires through

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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!

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