ARAG Electriccontrol unit for crop-spraing application 871 User Manual
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4.2
Adjustment of maximum operating pressure (only applicable for units with proportional
valve)
Should either of the following be noted during operation:
• pressure above the maximum limit for the system and safety valve;
• abnormal leaks of liquid;
stop work, switch the pump off and check that the installation and preliminary procedures
have been completed correctly.
1 Start pump operation.
2
Set the relevant switch on the control
device to 'ON' to open the main valve:
this will let fluid in through the system.
3 Gradually increase the number of revs of the pump until the maximum operating level is reached.
4
Push up the relevant switch on the control device to fully close the
proportional valve.
5
Close all the compensation cocks by turning their knobs clockwise.
6
Adjust the maximum pressure valve
by turning its knob clockwise until the
pressure of the valve is about 20%
above the unit’s maximum operating
pressure.