Setting The Minimum Working Pressure - Kärcher HDS-E 8/16-4 M Series Service Manual

6.2.2 Setting the minimum working pressure

1 Adjustment screw, high pressure
2 Lock nut, adjustment screw, high pressure
3 Spindle, pressure and quantity regulation
4 Adjustment screw, low pressure
5 Lock nut, adjustment screw, low pressure
6 Pump head

Fasten the test manometer to the high-pressure
connection.

Connect the high-pressure hose and gun to the
test manometer.

Install thenew high pressure nozzle.

Rotate the rotaring regulator on the gun to the po-
sition of highest pressure (direction "+").

Actuate the trigger on the gun and switch on the
appliance.

Rotate the rotating handle of the pressure regula-
tor on the pump anti-clockwise (direction "-") all
the way to the stop.

Pull off the rotary handle on the pressure regula-
tor.

Loosen the locknut of the adjustment screw for low
pressure.

Turn the adjustment screw low pressure together
with the spindle until the minimum working pres-
sure of the overflow valve of 3.5 to 4.0 MPa (35 to
40 bar) is reached on the test manometer.
Note
Turn in clock-wise direction to increase the working
pressure.
Turn in counterclockwise direction to decrease the
working pressure.

Secure the adjustment screw for low pressure by
tightening the locknut.

Check the working pressure, feed volume and
switch points of the pressure switches.

Then seal this setting.
English 5.906-548.0 Rev. 00 (04/12)
71