Manitowoc Published 12-10-19, Control # 258-05 4-73
MLC90A-1/MLC100-1 OPERATOR MANUAL SETUP AND INSTALLATION
Legend for Figure 4-46.
Remove Crane Counterweight
If equipped with Series 2 counterweight, remove the crane
counterweight BEFORE removing carbody counter-
weight.
See Figure 4-46
.
1. Activate the remote control in the main display. Read the
topic "Self-Erect Controls" on page 4-6
.
2. Prepare the boom stops:
a. Slowly raise the boom butt (1, View A) to
approximately 81°. This step will compress the
boom stop springs (2).
b. Stop raising the boom butt when the boom stop
inner tubes (2B, View B) are visible approximately
50 mm (2 in) into the slots in the boom stop outer
tubes (2A).
The hold-back holes in the inner and outer tubes
should now be aligned.
c. Remove the hold-back pins (3, View C) from the
storage holes (S) and install them in the working
holes (W) between the boom stop tubes.
3. The boom butt will now remain in position while the
gantry is raised and lowered during the remaining steps.
4. Use the remote control for the remaining steps. This will
allow the operator to stand at the rear of the crane and
view the removal procedure.
• Turn ON the SYNC switch on the remote control
so the gantry raising cylinders follow the gantry as it
is raised and lowered during the following steps.
See Section 3 of the Operator Manual for detailed
instructions.
• Use the Drum 4 (boom hoist) thumbwheel on the
remote control to raise and lower the gantry.
5. Lower the gantry (4, View C) (boom down using the
Drum 4 thumbwheel on the remote control) until the
handling pendants (5) can be pinned to the handling
links (6).
The pendants are stored on the counterweight tray.
6. Pin the handling pendants (5, View C) to the handling
links (6) with the pendant pins (7).
7. Slowly raise the gantry (boom up using the Drum 4
thumbwheel on the remote control) until the handling
pendants are tight.
Continued on next page.
Item Description
1 Boom Butt at 81°
2 Boom Stop Spring Compressed (qty 2)
2A Boom Stop Outer Tube (Qty 2)
2B Boom Stop Inner Tube (Qty 2)
3 Hold-Back Pin with Hair-Pin Cotter (qty 2)
4 Gantry
5 Handling Pendant (Qty 4)
6 Handling Link (Qty 2)
7 Pendant Pin with Cotter Pin (Qty 4)
8 Adjustable Handling Link (Qty 2)
9 Crane Counterweight
10 Counterweight Pin (Qty 2)
S Storage Hole
W Working Holes
DANGER
Crush Hazard!
Avoid being crushed by moving parts:
• Do not stand on the crane counterweight while it is
being raised or lowered.
• Do not climb onto the crane counterweight once the
counterweight pins are disengaged.
• Never go under the crane counterweight when it is
unpinned from the crane and hanging from the gantry.
CAUTION
Avoid Structural Damage to Crane!
Use extreme care when compressing the boom stops
during the following steps. Do not compress the boom
stops until they are solid. Damage to the boom butt or
boom stops can occur.
Stop compressing the boom stops when the hold-back
holes are aligned.
WARNING
Crush Hazard!
Moving parts can cut or crush.
Do not stick your fingers into the slots in the boom stop
outer tubes (2A, View B, Figure 4-46
).
CAUTION
Avoid Damage to Pendants!
Use extreme care when raising gantry during following
step. Make sure the handling pendants don’t get caught
on the pins and links.