Kärcher HDS 9/50 De Tr1 Service Manual page 174

174
English 5.906-736.0 Rev. 00 (07/15)
 Open gun.
With HDS 13/20 and HDS 17/20: Completely open the
pressure and volume regulation on the gun (set to "+").
 Set the maximum speed (+/-50 1/min) on the stop
screw full load.
 Secure the setting by means of a locknut.
 Close gun.
 Set the minimum speed (+/-50 1/min) on the stop screw
idle mode.
 Secure the setting by means of a locknut.
NOTE
The check of the motor speed can be performed with the
measuring device 6.491-361.0.
The speed is established via the vibrations present on the
motor. The rev counter is applied at a suitable spot. Push
out the resonance spring until the amplitude with running
motor is the largest. Now the speed can be read on the
scale.
1 Adjustment screw, high pressure
2 Lock nut, adjustment screw, high pressure
3 Spindle, pressure and quantity regulation
4 Housing, overflow valve
Check setting safety valve
NOTE
The safety valves are preset by the factory.
HDS 13/20 and 17/20: The presetting at 240bar is done in
the factory.
HDS 9/50 and 13/35: The safety valve is permanently set
and stamped:
with 350bar device: Setting 440bar
–
with 500bar device: Setting 640bar
–
NOTE
The check of the safety valve is performed by increasing
the pressure in the overflow device until the safety valve
starts dripping.
The check is done with the test nozzle.
 Install the test manometer (special tool) to the high-
pressure connection.
 Connect the high-pressure hose with gun and rotary
regulator to the test manometer.
 Open gun.
With HDS 13/20 and HDS 17/20: Completely close the
pressure and volume regulation on the gun (set to "-").
 Open the lock nut on the overflow device.
 Turn the adjustment screw high pressure until the safe-
ty valve starts dripping.
 Read the pressure on the test pressure gauge, see
technical data.
NOTE
If this screw is turned clockwise, the pressure is increased;
and if it is turned counter-clockwise, the pressure is de-
creased.