Noisy Miele Vacuum Cleaner C2 cat and dog

Shows general view of Miele C2 vacuum cleaner (after cleaning)

Image shows inside of the vacuum cleaner with the top removed after undoing 7 T20 screws. To remove the back two screws, it is necessary to remove the lid, which is done by pulling the two plastic pivot lugs out of their holes (a bit of force required). Then unclip the switch assembly and remove it after detaching its cable.

Now pull off the top cover assembly. This may stick a bit as parts of the top cover fits into rubber seals. Pull the power cord out a few inches may help.

Remove and clean (if necessary) the soft (sound adsorbing?) padding around the motor housing. Pull the cable off the motor and unclip the rear bracket holding the housing, so the motor assembly can be lifter out. I used another vacuum cleaner to clean everything during disassembly.

Shows motor housing with its metallic fan. To get access to the fan, it's necessary to remove its metallic cover. This is done by tapping with edges with a small hammer.

In my case, all 16 ducts in the fan were partially (90%?) blocked with sawdust and sand. This deposit was removed with a fine jewellers screwdriver from both ends. debris in the middle was removed using a curved piece of copper wire (2mm diameter).

The debris was continuously sucked away to stop it entering the motor. The motor was labelled MRG 403-42/2

I also placed a drop of oil on the rear bearing thinking some might seep into the sealed bearing chamber as the grease may have dried out with hot running. (Not sure if this was necessary). The front bearing was not accessible without removing the fan. The rotor turned easily and was not noticeably improved with the oil.

The parts were reassembled and the excessive noise had disappeared.