SECTION 5 - HYDRAULICS
5-14
– JLG Lift –
3121623
Emergency Gravity Descent System
Cylinders for 1st and 2nd booms, 3rd boom and jib are equipped with a coil valve for gravity emergency descent, they are
controlled by the control module when the remote control button "gravity emergency descent" is pressed.
When they are fed they open a calibrated passage and under the gravity effect (weight) they will allow oil to get out from
the bottom of the cylinder flowing back to the tank (through the ON-OFF valves), so that booms will slow down.
The coil valve for gravity emergency descent has a blue cap.
Hydraulic System Sections
The hoses that start from the boom component manifold valves and go through the booms are sectionized with fittings
inside the second boom where is indicated by the blue arrow here below.
Other sectioning points are on the catenary, at the beginning and at the end of the rigid pipes and are attached to the
hoses coming from the lower booms and the hoses going to the jib arm.
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