Manitowoc Published 08-12-19, Control # 224-13 3-51
MLC650 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
Luffing Jib Maximum Down 2 (minimum angle)
A limit switch stops the luffing jib before the boom-to-luffing jib angle is 68.5°.
• This limit cannot be bypassed.
• If this limit is contacted on cranes meeting CE requirements, the luffing jib cannot be raised until the
limit is reset. See Resetting Luffing Jib Limits on page 3-55
.
WARNING
Falling Boom/Jib Hazard!
Do not lower the luffing jib below the minimum angle given in the Luffing Jib Raising (and lowering)
Procedure chart. Structural damage could result, possibly causing the boom and luffing jib to collapse.
Luffing Jib Maximum Up 1 (maximum working angle)
This programmed limit stops the luffing jib when the boom-to-luffing jib angle is 170°.
• The luffing jib can be lowered after this limit is reached.
• The limit bypass switch must be turned to the bypass position to raise the jib an additional 1.5° to the
Luffing Jib Maximum Up 2 limit.
WARNING
Falling Boom/Jib Hazard!
Proceed slowly when operating the luffing jib above the Luffing Jib Maximum Up 1 limit.
Do not raise the luffing jib above the Luffing Jib Maximum Up 2 limit. Structural damage will occur, possibly
causing the boom and luffing jib to be pulled over backwards.
Luffing Jib Maximum Up 2 (maximum angle)
A limit switch stops the luffing jib before the boom-to-luffing jib angle is 171.5°.
• This limit cannot be bypassed.
• If this limit is contacted on cranes meeting CE requirements, the luffing jib cannot be raised until the
limit is reset. See Resetting Luffing Jib Limits on page 3-55
.
Luffing Jib Stop Misaligned
This limit stops the corresponding hoist if:
• you try to luff up when either jib stop is not fully extended (raised). The limit can be bypassed in the
luffing jib setup mode only if the boom angle is less than 50°.
• you try to boom down or luff up when either jib stop is fully extended (raised) and the boom angle is less
than 30°.
Mast (live) Accessory Fault
If the crane is configured with a live mast only, this limit stops the mast hoist from operating in either
direction. Check the pressure transducers for the live mast hoist and the accessory system.
Operating Limit Icon
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