Kärcher ARMADA BRC 40/22 C Manual page 11

Carefully work the motor out of the lower vacuum housing.
Using a #2 Philips screw driver remove the 2 screws
holding the carbon brush cover on.
Using the T-20 Torx driver remove the 3 screws holding the upper
housing to the vacuum motor.
Inspect the lower vacuum housing and motor for evidence of
dry vacuuming in the form of dry dirt and water from foam.
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