56
The HiPro system
Operator's Manual GB
4.7
4.7
Dump valves
Dump valve 1.
①
Allows operation of the crane functions. To
prevent high pressure and thereby unnecessary
heating of the oil there is an automatic dumping
function. When no lever movement has been
made for 3 seconds the dump valve is opened and
the oil is returned directly to the hydraulic tank.
As soon as the operator moves a lever the valve
closes.
Dump valve 2.
②
Allows operation of the stabiliser extensions and
legs only when this valve is activated. The dump
valve 2 will be placed between the main control
valve and the stabiliser control valve. The dump
valve 2 must be activated from the user panel
before the stabiliser system can be controlled.
4.8
Pressure reduction filter
Pressure reduction filter integrated in the main
control valve. The filter feeds the positioners with
filtered oil.