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2.6. LHV Load holding valves
The crane is equipped with load-holding valves as a safety
device. After a crane movement 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 required.
2.7. Premium high seat [option]
(1) Handle to adjust seat forward/backward
(2) Seat belt
(3) Handle to adjust height of the seat
(4) Locking device for seat tilting
(5) Handle to adjust armrest
DANGER
For cranes with joysticks and HPC, always deactivate HPC before leaving the high
seat.
DANGER
Take care not to put your foot on the pedals when taking place in the high seat.
Unintentional crane movements can occur.
2.7.1. Controlbox
NOTE
The order of the buttons may differ, some are options. Please follow the symbol on
the button.
12
Structure and parts of the crane
Jonsered 1250RZ -1500RZ safety+R CE
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