Kärcher HD 1090 Service Handbook page 22

Troubleshooting and basic settings
Unit does not reach required pressure
Fitting the shut-off valve
150 200
100
250
50
300
0
bar
Setting operating pressure
12
Checking flow rate
20
Check flow rate
– Mount the water inlet hose.
– Mount the shut-off valve at the high-pressure
– Connect the high-pressure hose with hand-
– With the handgun open, start up the unit.
– Use the shut-off valve to set operating pressu-
– Using a suitable container, time and measure
150 200
100
250
50
300
0
bar
outlet.
gun (no nozzle) to the shut-off valve.
re (see technical data).
the water flow volume (e.g., liters per minute).
If there is too little water, there may be an
external water loss (visible water leakage) or
an internal water loss (concealed water leaka-
ge), e.g., pressure valves, suction valves,
overflow valve leaking.