Regulate The Working Pressure By Means Of The Rotary Know On The Gun - Kärcher HD 20/15-4 Service Manual


Loosen both hollow screws at the same time to re-
move the overflow casing in order not to damage
the O-rings.
5.4.5 Regulate the working pressure by means of
the rotary know on the gun
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 Housing, overflow valve
Preparation

Fasten the test manometer to the high-pressure
connection.

Connect the high-pressure hose with the servo
press hand spray gun to the test manometer.
Setting the maximum working pressure:

Rotate the servo press to the "MIN" position, open
the hand spray gun and let the device run.

Turn in the rotary handle of the pressure and
quantity regulation until it stops (MAX value).

Pull off the rotary handle.

Loosen the locknut for high pressure.

Turn the adjustment screw high pressure so that
the pressure display on the test manometer
16
English 5.906-494.0 Rev. 01 (04/11)
equals the maximum working pressure in the
Chapter "Specifications".

Secure the adjustment screw for high pressure by
tightening the locknut.

Seal the adjustment screw for high pressure and
the lock nut with locking paint.
Setting the minimum working pressure:

Install thenew high pressure nozzle.

Rotate the servo press to the "MAX" position,
open the hand spray gun and let the device run.

Pull off the rotary handle.

Loosen the locknut for low pressure.

Turn the adjustment screw low pressure and the
spindle for pressure/quantity regulation at the
same time, so that the pressure display on the test
manometer equals the minimum working pressure
in the Chapter "Specifications".

Secure the adjustment screw for low pressure by
tightening the locknut.

Seal the adjustment screw for high pressure and
the lock nut with locking paint.