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Dyson DC08 Vacuum Cleaner Repair (With Video)
As with all things, parts eventually wear out and need replacement.
This Dyson vacuum cleaner has been part of our household since about 2002, when this model was first introduced. But, during use, it started to smell and finally stopped.
After disassembling the plastic housing, which included the wheels, filter assembly & cyclonic housing, the switch and motor were now exposed for testing.
Although I was sure that the switch had not created the fatal smell, I checked it and was surprised to find that the resistance changed during repeated testing – a sure sign that it had damaged contact points.
Testing of the switch was simple. By just bypassing the switch assembly, the non-working motor showed that the main problem was not with the switch.
After dissembling the motor housing, the commutator and brushes were examined. It was clear from the amount of carbon on the housing that the brushes would be worn. The segments of the commutator were darkened by years of arching and carbon build up from the brushes.
Next, the thermal fuse was tested and found to have continuity.
The armature was tested for continuity and shorts to ground and found to be OK. Testing of the field coils showed there was no open circuits or shorts to ground.
After removal of the brush packs, the fault became obvious – they had simply worn out and one brush had even worn past its end of life line.
A series wound or universal motor has only one path for current to pass. Therefore testing is relatively easy. Testing of the input and output wires will prove circuit integrity, checking all of the circuit in one easy operation. Of course it is important to check all components separately to ensure all sections are thoroughly tested. Complete testing would include the use of an insulation tester to check for any breakdown between windings in the field coils as well as the armature.
After purchase of a new set of brushes and a switch, it could be clearly seen how badly the brushes had worn.
Of course it is vital to clean the commutator to provide positive brush contact. Use of emery tape or sandpaper creates a clean, even surface.
Just ensure that any particles are removed and the segments are clean between the commutator. I used compressed air to accomplish this.
One of the advantages of a universal motor is that it can operate using either AC or DC voltage. So to test this motor, I simply powered it up using an old UPS 12 volt battery that I use for testing purposes.
This showed that the motor was now operating correctly.
Now was the ideal time to add tension to the power cord return spring by turning the cord around the retractor several times before refitting it to the housing. This will ensure that the cord returns all the way back into its socket.
After reassembly of all components, only I final thing is required – the dreaded road test!
If you are interested in this repair, you can see a video on my channel following the link below.
This article was prepared for you by Mark Rabone from Australia.
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Note: You can check out his previous repair article below: