Kärcher HD 9/50-4 Cage Service Manual page 29

Dismantle both the flange bearings at the pump casing; to do
that, first loosen the four screws at the flange. At the end, you
can pull out the flange bearings. Tightening torque 20 Nm.
Press the piston rods backwards to the end-position and take
out the crank shaft.
Unscrew the piston screws using an Allen wrench and pull out
the piston rod from the rear.
English 5.906-441.0 Rev. 01 (06/10)
29