Kärcher HDS 9/50 De Tr1 Service Manual page 116

 Unscrew the lower casing part of the overflow device
from the pump.
NOTE
Ensure that also the valve seat with the O-ring is removed
from the pump casing; remove by means of pliers if neces-
sary.
Wear parts:
1 Casing with taper seat
2 Spring
3 Valve seat with O-ring
 If necessary, change the entire unit.
 Reinstall the overflow device.
NOTE
When the overflow device is misadjusted, refer to informa-
tion further back in this chapter.
116
English 5.906-736.0 Rev. 00 (07/15)