I T L S E R V I C E M A N U A L
H-15
HYDRAULIC SYSTEM
The lifting speed depends on the pump rpm.
The external relief valve is directly connected to the inlet port of oil coming from the pump.
The Control spool “1” is in such a position to connect the chamber “5” of the differential valve “2” with oil coming from
the pump through annular duct “8” and holes “12” and “13” making in this way the valve itself to close.
During this phase the Control Valve supplies the oil under pressure to the cylinder “9” and it consequently lifts the
arms.
The oil from the pump finding the differential valve “2” closed goes to cylinder, pass the hole “14” opens the check
valve “3” enters in the annular duct “11” and enters the chamber “9”.
Delivery Phase
In this phase the maximum lifting pressure is controlled by the safety valve “15” that is connected to the annular duct
“8” through hole “14” and then to the oil inlet.
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