18
Structure and parts of the HIAB crane
Operator's Manual GB
2.7
2.7
LHV Load holding valves
All cylinders are equipped with load-holding
valves as a safety device. After a crane move-
ment they hold the crane in position, also in the
unlikely event of a burst hose.
If there is a leak or a component fractures, such
as a pipe, hose or a coupling, the load-holding
valves will stop the booms from collapsing down,
even when the hydraulic system is switched off,
and you operate a particular crane function.
To operate a hydraulic cylinder equiped with a
load holding valve, an opening pressure is re-
quired.
2.8
Description of HIAB X-Duo
The HIAB
X-Duo 044
X-Duo 078
X-Duo 088
X-Duo 102
X-Duo 112
are a compact, fully hydraulically operated loader
cranes.
The crane type and the manufacturer are marked
on the manufacturer plate.
! NOTE
The exact technical information for your crane is
shown in the Technical Data.