Replacing The Water Pump; Voltage Measurement On The Water Pump; 5.1.10 Replacing The Toothed Belt - Kärcher BR 30/4 C Service Manual

5.1.8

Replacing the water pump

1 Shaped hose, water distribution bar connection
2 Water pump (M2)
 Remove the cleaning head housing (see chapter "Re-
moving the cleaning head housing").
 Pull the shaped hose off the connection of the water
distribution bar.
 Pull the water pump out of the water pump holder to-
ward the top.
1 Shaped hose, water distribution bar connection
2 Water pump (M2)
3 Water hose to the water pump
4 Pump holder, rubber
5 Pump holder, rubber
6 Connector, connecting cable to water pump
7 Diode, soldered into the cable
The rectifier diode converts AC voltage to pulsating direct
voltage. This will result in the water pump feeding the wa-
ter evenly.
The supply voltage can be read at the Molex plug.
Target value:
Water pump switch turned off = 0 V AC
Water pump switch turned on = current voltage
BR 30/4 C Bp Pack
22
English 5.906-768.0 Rev. 01 (10/20)
1 Connecting cable
2 Water hose to the water pump
3 Water pump (M2)
4 Pump holder, rubber
5 Shaped hose, water distribution bar connection
6 Connector, connecting cable to water pump
 Pull the shaped hose off the water pump.
 Pull the hose off the water pump.
 Remove the pump holder from the water pump.
 Disconnect the connectors
 Install the new water pump in reverse order.
5.1.9

Voltage measurement on the water pump

NOTICE
BR 30/4 C onlyBp Pack:
The connection voltage of 24 Volts is pulsed; therefore,
only about 12 Volts can be measured on the water pump.
This water pump does not have a diode. The water pump
is monitored by current. If the current pickup is too high, it
is switched off.

5.1.10 Replacing the toothed belt

1 Fastening screws (2x), cover
2 Cover
 Remove the cleaning head casing (see chapter "Re-
moving the cleaning head casing").
 Unscrew the screws.
 Remove cover.