Kärcher HD 9/50-4 Cage Service Manual page 28

Loosen the 4 flange screws from the pump casing.
Carefully remove the pump casing using the proper tools at the
respective pockets.
Remove the casing lid from the pump casing by opening the
four screws.
Mark the bearing shells with the piston rod so that they do not
get interchanged during assembling.
28
English 5.906-441.0 Rev. 01 (06/10)
Loosen the bearing shells of the piston rod and take out the
bearing shells.
Note
Every bearing cup must later be refastened to the same piston rod
with the same alignment. Therefore, mark the components prior to
removal.