Manitowoc Published 08-12-19, Control # 224-13_v2 4-179
MLC650 OPERATOR MANUAL SET-UP AND INSTALLATION
Securing Live Mast, Gantry, and Backhitch
See Figure 4-137 for the following procedure:
1. Boom up and lower the live mast to 40°.
2. Remove the gantry link pin (6a) from the gantry
assembly (5) on both sides.
3. Remove the cotter pin and the backhitch link pin (2a)
from the backhitch assembly (1) on both sides.
NOTE: If the pin is difficult to remove, extend the mast
raising cylinders to tighten the rope and relieve
pressure on the backhitch link pin.
4. After the gantry and backhitch link pins are removed,
continue to boom up to lower the live mast until the mast
reaches approximately 2°, then stop.
NOTE: As the live mast approaches the horizontal
position, the gantry assembly may contact the mast
roller. This is acceptable.
5. Lower the live mast the rest of the way using the mast
assist cylinders.
6. With the live mast fully lowered, insert the backhitch link
pin (2b) into the shipping position.
7. Install the gantry link pin (6b) into the shipping position.
8. Remove the gantry pin (7b) from the stored position and
place the gantry pin (7a) in the shipping position.
9. Remove the live mast locking pin from the storage
bracket (3) and remove the pin, place the pin and locking
pin (4) in the shipping position, securing the live mast to
the gantry assembly.