OPERATING CONTROLS AND PROCEDURES MLC650 OPERATOR MANUAL
3-52
Published 08-12-19, Control # 224-13
Mast Arms Down
With the Setup Mode ON, this limit stops the boom hoist if you attempt to raise the live mast when the mast
arms are down.
WARNING
Falling Mast/Boom Hazard!
Prevent the mast from falling over backwards:
• Fully raise the mast-assist arms before raising the live mast to vertical. The mast can fall over
backwards if this precaution is not taken.
Mast Arms Up
With the Setup Mode OFF (any boom or jib configuration selected in RCL/RCI), this limit stops the boom
hoist if you attempt to raise the boom when the mast assist arms are up.
WARNING
Falling Mast/Boom Hazard!
Prevent the mast and the boom from falling:
• Fully lower the mast-assist arms before raising the boom. The mast can buckle and collapse if it
contacts the mast-assist arms with a fully rigged boom.
Mast too Far Back
This limit stops the boom hoist when the live mast is lowered rearward to 2°. Finish lowering the mast to
the transport position (0°) manually with the switch on the remote control or on the right console in the cab.
Mast too Far Forward
The fault alarm for this limit is activated when the live mast is lowered forward to 158° during crane
assembly and disassembly.
WARNING
Falling Mast Hazard!
Do not lower the mast below the specified angle. Raise the live mast when this fault is activated. Further
lowering is not approved - the mast could fall.
Mast (fixed) Stop
This limit stops boom hoist operation if the mast stop cylinders retract for any reason. The cylinders must
be extended at all times.
Operator Out of Seat
This limit prevents the crane functions from being operated when the operator is out of the seat. Sit down
in the seat to operate the crane functions.
Operating Limit Icon
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