USER
MANUAL
809NG
U
SE
B.14
7845469-01 03/20
subject to change without notice
B.5
SAFETY DEVICES
B.5.1
OVERCENTER VALVES
The overcenter valves are fitted on the 1
st
boom cylinder and on the 2
nd
boom cylinder. Their
purpose is to lower or block the load if the pressure into the cylinders reaches the setting value. So
the crane structure is made safe.
When the valve opens, the operator must retract the hydraulic extensions immediately, to
stop the descent of the load.
B.5.2
EMERGENCY STOP BUTTON
The emergency stop buttons are installed at the control positions of EC cranes.
In case of danger or emergency, the crane’s movements can be blocked immediately by pressing
one of the stop buttons.
To restore the normal operating conditions, turn the head of the button until the release is engaged
and the button returns to its normal position.
Before restoring the normal operating conditions, always check that the emergency situation
no longer exists and that the safety is guaranteed again.