Manitowoc Published 11-20-19, Control # 234-19 4-43
MLC300 OPERATOR MANUAL SETUP AND INSTALLATION
• BOOM CONTROL HANDLE to raise and lower the live
mast while using it as a boom for crane assembly and
disassembly.
• CENTER DRUM CONTROL HANDLE (on right console)
to extend and retract the self-erect cylinder.
1. Make sure all pins between the live mast (1), the
equalizer (5) and the boom hoist (3) are removed and
stored. Damage can occur if pins are still installed.
2. Select the Liftcrane Mast Capacities Chart in the RCL/
RCI Display.
3. During the raising procedure, monitor the MAST ANGLE
in the crane status information bar of the Main Display
Working Screen.
4. Increase engine speed to the desired RPM.
5. Check the boom hoist wire rope between the sheaves in
the end of the live mast (1) and the equalizer. If the wire
rope is slack, proceed as follows:
a. Extend the mast assist arm cylinders (2) with the
switch on the remote control or on the right console
in the cab.
b. Stop when the slack is out of the wire rope.
6. BOOM DOWN with the boom control handle to raise the
live mast (1).
The live mast will rise as the mast assist arm cylinders
(2) extend automatically.
7. Stop raising the live mast when it is vertical (position B).
8. If required, slowly extend the self-erect cylinder (7) using
the center drum control handle until the lifting link (8)
disengages the storage bracket (9).
9. Continue to boom down to lower the live mast to the
desired operating position.
The mast assist arms will stop rising automatically when
the cylinders are fully extended at approximately 115°
(position D).
10. Proceed to use the live mast as a boom with the boom
control handle and the middle drum control handle for
the remainder of the self-erect assembly procedures.
See Liftcrane Mast Capacities chart at the end of this
section for detailed lifting capacities.
11. AFTER the live mast is raised:
a. Rotate the left-rear platform (9, Figure 4-19 on
page 4-22) from the stored position to the working
position.
b. Extend the handrail (6, Figure 4-19 on page 4-22
)
from the stored position and pin it in the working
position.
Live Mast Operating Precautions
The following will occur if the live mast is
lowered to 158°:
• The mast will stop lowering.
• The hazard warning will come on and the
MAST TOO FAR FORWARD icon will appear in the fault
bar of the Main Display Working Screen.
When the SETUP MODE is ON, the following will
occur if you attempt to raise the live mast when
the mast assist arms are down:
• The boom hoist will not operate.
• The hazard warning will come on and the MAST ASSIST
ARMS DOWN icon will appear in the fault bar of the
Main Display Working Screen.
• Make sure the mast assist arms are fully raised before
raising the mast.
When the SETUP MODE is OFF, the following
will occur if you attempt to raise the boom when
the mast assist arms are up:
• The boom hoist will not operate.
• The hazard warning will come on and the MAST ASSIST
ARMS UP icon will appear in the fault bar of the Main
Display Working Screen.
• Make sure the mast assist arms are fully lowered before
raising the mast and boom.
WARNING
Falling Mast Hazard!
Prevent the live mast from falling:
• Do not use the limit bypass switch to lower the live
mast below 158°. The mast will fall suddenly.
Connect an assist crane to end of mast if it is
necessary to lower it below 158°.
• Do not lower the mast assist arms until the live mast
is connected to the boom straps. The mast will fall
over backwards if raised toward vertical when the
mast assist arms are down.
• Do not raise the boom with the live mast until the
mast assist arms are fully lowered.
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