How to remove the motor of the Electrolux ZA 55

[vaclover]

Hi guys, I've got an Electrolux Model ZA 55, the bearings and brushes needs replacement, but I can't get further than removing the suction fans. There seems to be circlips that keeps the upper cover in place, but I can't get that cover removed to get to the brushholder and to remove the armature for bearing replacement. The motor looks exactly the same as my Z302, only difference is how the motor is put together.