Kärcher ARMADA BRC 40/22 C Manual page 28

Reverse these steps to reinstall the upper deck to the machine.
There are three critical steps when attaching the upper deck that will require additional work if missed (see below).
Make sure the ball bearing is placed back into the groove in
the pivot.
Once the snap ring is installed you should inspect it to
make sure it is completely seated in the groove. If the snap
ring comes loose the scrub head will sag and dig into the
carpet during use.
Place the pivot support onto the deck once it is seated the
snap ring groove will be visible.
Reinstall the rubber seal (if equipped), using a blunt
tool press the center of the seal into the pivot to pre-
vent interference when operating the machine.
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