Manitowoc Published 12-10-19, Control # 258-05 4-65
MLC90A-1/MLC100-1 OPERATOR MANUAL SETUP AND INSTALLATION
Legend for Figure 4-42.
NOTE The jib strut can be lowered either using an assist
crane or with the whip line (Drum 1) from this crane.
The strut can be lowered with the whip line only
for boom lengths longer than 22 m (72.2 ft). For
lesser boom lengths, the equalizer will interfere
with rope routing.
If the strut will be lowered with the whip line, store the
strut stops and lower the strut BEFORE
disconnecting the boom butt from the boom.
Store Strut Stops
See Figure 4-42.
Perform the following steps at both strut stops (18), one side
at a time.
1. Remove the stop pin (20W, View F).
2. Support the inner stop tube (18A, View E) and remove
the pin (19).
3. Rotate the inner stop tube (18A, View D) 90°, fully retract
the inner stop tube, and install the stop pin (20S, View
C).
4. Install the pin (19, View D) in the inner stop tube (18A).
5. Lower the strut stop onto the jib strut (4, View C).
Deploy Strut Raising Arm
See Figure 4-42.
1. Remove the rope guard pin (16, View F).
2. Route the whip line (12, View C) from Drum 1 to the end
of the strut raising arm (13).
3. If not already done, assemble the button socket (14,
View C) to the end of the whip line (12).
4. Pin the button socket (14, View C) to the strut raising
arm (13) with the pin (15) and cotter pin.
Lower Jib Strut
See Figure 4-42.
1. Slowly haul in the whip line (12, Views B and C) from
Drum 1 so the jib pendants (5 and 8) are tight and the
backstay pendants (10 or 10A, View A) are loose.
2. Unpin the backstay pendants (10 or 10A, View A) from
backstay lugs (17) on the boom top and lower the
pendants to the ground.
3. Slowly pay out the whip line (12, View B) — lower jib
strut (4) — until the jib strut is resting on the bumpers on
the jib bottom (1).
Guide the pendants clear of the boom top and the jib
sections as the strut lowers. Do not allow the pendants
to catch on the jib section connecting pins or to rub
against the boom top or the jib sections.
4. Support the strut raising arm by hand and disconnect the
button socket (14, View C) from the strut raising arm
(13).
5. Lower the strut raising arm (13, View F), by hand, to the
stored position against the jib strut (4) and install the
rope guide pin (16) and safety pin.
6. Haul in the whip line onto Drum 1 and store it for
shipping.
Item Description
1 Jib Bottom
2 Boom Top
3Not Used
4Jib Strut
5 Jib Top Pendant (Qty 2)
6Not Used
7 Pin with Cotter Pin (Qty 1 or 2 each pendant)
8 Jib Insert Pendant (Qty 2 or 4 if installed)
10 Backstay Pendant (Qty 2)
10A 30° Offset Pendant (Qty 2)
11 Not Used
12 Whip Line (Drum 1)
13 Strut Raising Arm
14 Button Socket
15 Pin with Cotter Pin
16 Rope Guide Pin with Safety Pin
17 Backstay Lug (Qty 2)
18 Strut Stop (Qty 2)
18A Inner Stop Tube (Qty 2)
19 Pin with Safety Pins (Qty 2)
20 Stop Pin with Safety Pin (Qty 2)
21 Strut Stop Lug (Qty 2)
S Storage Hole
W Working Holes
CAUTION
Avoid Structural Damage!
DO NOT LIFT JIB POINT OFF GROUND during step 1.
Structural damage may occur.