HDS Middle Range / HDS Premium Range
Basic Settings and Service Procedures
Service Manual 04.2008
Page 97 / 127
3.6
Adjusting the operating pressure using standard handgun
without rotary control
1
2
3
4
5
6
1 Adjusting screw, high pressure
2 Lock nut, high pressure adjusting screw
3 Spindle, pressure and flow control valve
4 Adjusting screw, low pressure
5 Lock nut, low pressure adjusting screw
6 Housing, unloader valve
Adjusting the maximum operating pressure
– Install test pressure gauge at high-pressure
connection. The high-pressure connection can
be directly at the unit outlet or on the handgun
in units with hose reel.
– Connect the high-pressure hose with standard
handgun at the test pressure gauge.
– Install the new high-pressure nozzle.
– Open standard handgun and let the unit run.
– Twist in the rotating handle of the pressure
and flow control valve at the pump up to the
limit stop („+“ direction).
– Then pull off the rotating handle.
– Undo the lock nut (2) for high-pressure
adjusting screw (1).
– Turn the high-pressure adjusting screw (1) so
that the opening pressure from the overflow
valve (see Technical Specifications, full load)
at the test pressure gauge is reached.
Note:
The maximum operating pressure is set
using the standard handgun without rotary
control.
– After adjusting the high-pressure adjusting
screw (1) secure with the lock nut (2). Re-
check operating pressure, flow rate and
switching points of the pressure switch.
– Finally, seal the high-pressure adjustment
screw (1) and the lock nut (2) with locking
compound.
Note:
Turn in clockwise direction to increase the
pressure, turn in anti-clockwise direction to
reduce the pressure.