Manitowoc Published 08-12-19, Control # 224-13_v2 4-47
MLC650 OPERATOR MANUAL SET-UP AND INSTALLATION
6. Check the boom hoist wire rope between the sheaves in
the end of the live mast (1) and the gantry (2). If the wire
rope is slack, proceed as follows:
a. Extend the live mast assist cylinders (9,
Figure 4-38
) 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.
7. BOOM DOWN with the boom control handle to raise the
live mast (1, Figure 4-38
).
The live mast will rise while the live mast assist cylinders
(9) extend automatically.
8. Stop raising the live mast when the holes in the
backhitch (3, Figure 4-37
) are aligned with the holes in
the rotating bed (approximately 40°) and install the
backhitch pins (7).
NOTE: It is okay for the gantry to contact the mast roller (8,
Figure 4-37
).
9. If the pin holes do not align, extend the live mast assist
cylinders (7) to tighten the ropes and align the pin holes.
10. With the backhitch secured, continue to boom down to
raise the live mast to the desired position.
WARNING
Unintended Cylinder Movement
The self-erect cylinder can creep due to thermal expan-
sion/contraction. Inspect the self-erect cylinder before any
operation when the live mast is pivoted forward past 90°
to verify that the cylinder is fully retracted and engaged
with the retention bracket.
If the self-erect cylinder comes free of the retention
bracket, it will swing freely, which could result in death or
serious injury.
FIGURE 4-38
Item Description
1Live Mast
2Gantry
3 Backhitch
4-8 Not Used
9 Mast Assist Cylinders
10 Live Mast Links/Straps
11 Self-Erect Cylinder
Item Description
A Transport Position (fully lowered)
B Mast at 40°
C Mast at 85°
D Mast at 107° (cylinders fully extended)
E Mast at 110°
F Mast Operating Range (see Liftcrane
Mast Handling Capacities Chart at end
of this section)
G Maximum Mast Angle at 158°
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