Kärcher HDS 9/50 De Tr1 Service Manual page 120

Suction/pressure valve setup
120
English 5.906-736.0 Rev. 00 (07/15)
 Pull out the suction valves using special pliers (4.901-
602.0). If the valve seat gets stuck in the pump head,
you can pull it out using the drawing tool (6.815-013.0).