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Author Topic: Poor brush head suction  (Read 3633 times)

Offline beemox

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Poor brush head suction
« on: January 23, 2011, 03:32:34 PM »
Hi, I have 3 dco7 he-pa vacs , one works very well and you can tell that its suction on the carpet is far better than the other two . One of the other two recently had a 1600w pattern motor fitted , all three have had new filters  and have been emptied out . The switchover (brush to wand) valve units and springs look to be working OK . the bottom hoses are OK  and i have checked the vacuum readings at severall points on each vac  ie cyclone exit port , cyclone inlet port , end of wand , and at the brush head end of the short flexi pipe . All seem to be similar  (6.5 ins hg ) . I have tried swapping the cyclone unit from the good one to the other two in turn (no improvement).
The vacuum  measurements only prove that each motor is capable of pulling the same ultimate  vacuum  as each other , but of course cannot measure the actual flow rate . One thing that i noticed was that when the good example was in its upright position and then the handle pulled rearwards, the visible part of the sole plate at the front of the vac  came up  and its heel came down . in the two poorer examples , this movement was not apparent at all , so after a clean & lube of the pivots, the movement was a little bit better , so i helped it along with an elastic band slipped around the flexi hose in its middle and also around the u bend , thinking that the sole plate has to move readily to adjust to the floor angle . Result = barley perceptible improvement . I wonder if these replacement pattern motors are as good as the original Dyson units , or have i Missed something fundamental ?.

Offline aceone

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Re: Poor brush head suction
« Reply #1 on: January 23, 2011, 09:56:24 PM »
Hi have you tried removing the soleplate,and checking for an obstruction in there,that is quite a common area for lack of suction.......Mike

Online MVacs

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Re: Poor brush head suction
« Reply #2 on: January 24, 2011, 12:36:53 AM »
Do all these machines have clutches Beemox?

Offline Vacuum Cleaner House

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Re: Poor brush head suction
« Reply #3 on: January 24, 2011, 08:42:06 AM »
If the sole plate won't sit on the floor properly or spring up when the machine is lifted you probably need to replace the small hose underneath the machine as this acts as a spring and wears out from time to time , its also very important that you fit it correctly, sometimes just turning it a few degrees helps.
This is a very common and misunderstood problem with the dc14 and Dc07.
Owner of Vacuum Cleaner House, Full service vacuum shop in Cape Town South Africa

Offline beemox

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Re: Poor brush head suction
« Reply #4 on: January 25, 2011, 12:51:11 AM »
yes , all three of the machines have clutches , but they seem to be driving OK . When i stand the machines on their heads and run them with the clutches engaged , you can,t stop the brush rollers or even slow them down with your hand .

Offline beemox

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Re: Poor brush head suction
« Reply #5 on: January 25, 2011, 11:52:00 PM »
Hmm , might create a bleed on the sealing plates that i use to attach the vaccum gauge and see if there is any discrepancy in the machines being able to keep up . One of the other things that i did whilst testing the ultimate vaccum reading was to seal off the vaccum bypass valve on the end of the filter housing using duct tape . This was to ensure  that any difference's  in ultimate vaccum between the three machines was not corrupted by slightly differing springs in the bypass .

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Re: Poor brush head suction
« Reply #6 on: January 26, 2011, 03:05:10 AM »
I wonder if these replacement pattern motors are as good as the original Dyson units , or have i Missed something fundamental ?.

Is this a US or UK motor? Do you know whose motor it is?

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