MULTILIFT XR S - Construction; Hydraulics

XR21S59 CHU 154
1/2018
113813003
Hooklift Multilift XR21S59 CHU
User Manual
Construction
XR S hooklift equipment contains frames joined to each other which enable loading,
unloading and tipping of compatible Flatrack/bodies. The rear frame hinged to the rear end
of the sub-frame, which is fastened to the truck chassis, enables tipping of the Flatrack/
bodies (note: ISO Containers must never be tipped). The middle frame hinged to the rear
frame together with the hook arm sliding inside it, enable container loading and unloading.
Hydraulics
The conguration of the hooklift control valve comprises on the base plate situating,
electrically controlled directional valves, which distribute the oil ow to di󰀨erent cylinders.
There is one control valve for the hook arm and the locking cylinders and two for the
main cylinders. The main cylinder control valves operate at phases, depending on the
accessories, or at the same time and enable thus a more accurate control at slow speeds
and greater oil ow for simultaneous use.
There is a by-pass valve installed on the valve base plate, which is adjustable between
16 and 40 l/min. With this valve part of the oil ow is directed via the second valve of the
main cylinders back to the return line, and that is the way to obtain the accurate cylinder
movements when needed. The factory setting of the by-pass valve is 28 l/min. By turning
the valve close or open it is possible to obtain a slower motion of the main cylinder and to
adjust the speed of the hook arm cylinder.
The electrically controlled solenoid valve opens the free circulation ow, when no cylinder
movement is active.
The setting of the main pressure limiting valve is 300 bar, in addition of which the functioning
of the hydraulic locks and the hook arm out push pressure is limited to 180 bar.
There is a push button in the main cylinders’ rst valve, the hook arm cylinder valve and
free circulation valve solenoid for possible emergency operation if the electrical current of
the hooklift disappears for some reason.