Adjusting The Operating Pressure Using Standard Handgun Without Rotary Control - Kärcher HDS Middle series Service Manual

Basic Settings and Service Procedures
3.6 Adjusting the operating pressure using standard handgun
without rotary control
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
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HDS Middle Range / HDS Premium Range
Adjusting the minimum operating pressure
1
– Install test pressure gauge at high-pressure
connection.
2
– Connect the high-pressure hose with standard
handgun at the test pressure gauge.
3
– Install the new high-pressure nozzle.
– Open standard handgun and let the unit run.
– Unscrew the rotating handle of the pressure
and flow control valve at the pump up to the
limit stop („-" direction).
4
– Then pull off the rotating handle.
– Loosen the lock nut (5).
5
– Twist the low-pressure adjusting screw (4)
and spindle (3) together until the minimum
operating
Specifications, part load) is reached at the test
6
pressure gauge.
Note:
Turn in clockwise direction to increase the
pressure, turn in anti-clockwise direction to
reduce the pressure.
– After adjusting, secure the low-pressure
adjusting screw (4) with the lock nut (5). Re-
check operating pressure, flow rate and
switching points of the pressure switch.
– Finally, seal the low-pressure adjustment
screw (4) and the lock nut (5) with locking
compound.
Note:
At minimum pressure and flow setting and
if using the steam nozzle supplied, the
pressure may not exceed 32 bar.
pressure (see Technical
Service Manual 04.2008