Replace The Pressure Switch - Kärcher CV 66/2 Service Manual

Remove the Y piece
Replace the safety plate
Reinstall the Y piece - this might require increased force.
Screw in the Y piece

5.16 Replace the pressure switch

The appliance incorporates a pressure switch, which monitors
the vacuum pressure. If this vacuum pressure becomes too high,
the pressure switch switches off the suction turbine. If the switch
is defective, it must be completely replaced.
Remove the turbine filter cover
14
English
The pressure switch is located in the center of the turbine tub
Remove the nut and seal of the pressure switch
Tilt the appliance backwards and remove the brush motor
Remove the brush motor from the appliance
Disconnect the cable connections on the pressure switch
Pull out the pressure switch
Install new pressure switch - watch for tightness!
Create a cable connection