OPERATING CONTROLS AND PROCEDURES MLC90A-1/MLC100-1 OPERATOR MANUAL
3-48
Published 12-10-19, Control # 258-05
Preparing Fully Rigged Boom for Low
Clearance Travel
See Figure 3-19.
1. Lower the boom onto blocking (6, View A) at least 1,52
m (5 ft) high.
2. Either remove the load block or connect it to the lug on
the font of the rotating bed.
3. Using the gantry cylinders switch on the right console,
fully retract the gantry cylinders (7, View A) to lower the
gantry (5, View B).
To activate the gantry cylinders switch, the Boom Butt
Configuration must be selected in the RCL/RCI Display.
4. Slowly pay out the boom hoist wire rope as required
while the gantry lowers.
5. Remove the safety pin (8, View C), the collar (9), and the
pin (10) from both counterweight handling links (11).
6. Rotate the counterweight handling links (11, View C)
toward the counterweight and align the holes in the
counterweight handling links with those in the tie-down
links (12).
7. Install the pins (10, View C), the collars (9), and the
safety pins (8) to attach the counterweight handling links
(11) to the tie-down links (12).
The pin heads must face inward.
8. Using the gantry cylinders switch on the right console,
extend the gantry cylinders until the counterweight
handling links (11, View D and E) and the tie-down links
(12) are taut.
9. Makes sure the boom hoist wire rope is spooled properly
on the boom hoist drum.
10. Raise the boom to no higher than 2° above horizontal.
11. The crane is now ready for travel. See Low Clearance
Travel Limitations on page 3-46.
Returning Gantry to Normal Operating
Position
See Figure 3-19.
1. Lower the boom onto blocking (6, View A) at least 1,52
m (5 ft) high.
2. Using the gantry cylinders switch on the right console,
fully retract the gantry cylinders (7, View B and C) to
lower the gantry (5).
3. Slowly pay out the boom hoist wire rope as required.
4. Support the counterweight handling links (11, View C)
and remove the safety pins (8), the collars (9), and the
pins (10).
5. Rotate the counterweight handling links (11, View C) to
vertical and reconnect the pins (10), the collars (9), and
the safety pins (8) to the counterweight handling links.
6. Make sure the boom hoist wire rope is spooled properly
on the boom hoist drum.
7. Using the gantry cylinders switch on the right console,
fully extend the gantry cylinders (7, View A) to raise the
gantry (5) to the normal operating position.
8. Select the desired Boom Configuration in the RCL/RCI
Display.
9. Raise the boom to the desired operating angle.
WARNING
Structural Damage Hazard
To avoid damage and possible collapse of boom, do not
attempt low clearance travel with a fully rigged boom
longer than 19 m (62.3 ft).
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