OPERATING CONTROLS AND PROCEDURES MLC300 OPERATOR MANUAL
3-48
Published 11-20-19, Control # 234-19
Function Diverted
This limit prevents Drums 1 and 3 from being operated at the same time. Drum 3 must be parked to
operate Drum 1. Drum 1 must be parked to operate Drum 3.
Function Parked
This limit prevents the selected crane function from being operated until the park switch is turned off (un-
parked).
Free Fall Lowering Over Speed
This limit does not stop operation. It alerts the operator if the load on either Drum 2 or 3 is being lowered
faster than 225 rpm, which can result in accelerated wear and shortened service life of the free fall brake.
Inactive Control Station
This limit applies only to cranes meeting CE requirements.
This limit prevents the cab controls from being operated when the remote control is being operated.
The remote control has priority. Therefore, if the cab controls are being operated and the remote control
becomes active, the cab controls will be disabled.
Luffing Jib Maximum Down 1 (minimum working angle)
This programmed limit stops the luffing jib when the boom-to-luffing jib angle is 70°.
• The luffing jib can be raised after this limit is reached.
• The limit bypass switch must be turned to the bypass position to lower the jib to the Luffing Jib
Maximum Down 2 limit.
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 3-53
.
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.
Operating Limit Icon
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