Adjusting The Operating Pressure Using The Rotary Control On The Handgun - Kärcher HDS Middle series Service Manual

HDS Middle Range / HDS Premium Range
3.5 Adjusting the operating pressure using the rotary control on
the handgun
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
Service Manual 04.2008
Basic Settings and Service Procedures
Adjusting the maximum operating pressure
1
Note:
The opening pressure of the overflow valve
2
is adjusted using the rotary control.
3
– Install test pressure gauge (special tool) 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 handgun
4
and rotary control to the test pressure gauge.
– Twist in the rotating handle of the pressure
and flow control valve at the pump up to the
5
limit stop („+" direction).
– Turn rotary control to position for lowest
pressure at the nozzle („-" direction), open
6
handgun and let unit run.
– 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:
Turn in clockwise direction to increase the
pressure, turn in anti-clockwise direction to
reduce the pressure.
– After adjusting, secure the high-pressure
adjusting screw (1) 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.
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