Manitowoc Published 12-10-19, Control # 258-05 4-75
MLC90A-1/MLC100-1 OPERATOR MANUAL SETUP AND INSTALLATION
Remove Crane Counterweight (continued)
8. Slowly continue to raise the gantry until the weight of the
crane counterweight (9, View D, Figure 4-46 on page 4-
72) is off the counterweight pins (10). The arrow (View
D) should be pointing at the green area of the alignment
decal.
The boom butt will rise slightly and the boom stops will
fully compress during this step.
9. Disengage the counterweight pins using the switch on
the remote control. Raise the gantry (counterweight) as
required to disengage the pins.
NOTE If the crane counterweight is raised too high, a limit
switch will trip open to stop the gantry and prevent
the backhitch from fully extending. The
COUNTERWEIGHT TOO HIGH fault will come on in
the main display.
10. Verify that the counterweight pins are fully disengaged.
See Figure 4-47
.
11. Slowly lower the gantry (4, View A) (boom down using
the Drum 4 thumbwheel on the remote control) to lower
the crane counterweight (9) to the ground. If necessary,
block under the counterweight tray so it is stable.
12. Once the counterweight has been lowered far enough,
engage the counterweight pins using the switch on the
remote control.
13. Continue to lower the gantry until the handling pendants
(5, View A) are slack.
14. Unpin the handling pendants (5, View A) from the
handling links (6).
15. Store the pendant pins (7, View A) in the pendant holes.
16. Store the handling pendants (5, View A) and the links
(8A and 8B) on the counterweight tray.
17. Leave the Handling links (6, View A) pinned to the gantry
links.
18. Fully raise the gantry (4, View C) (boom up using the
Drum 4 thumbwheel on the remote control) until the
cylinders are fully extended and the backhitch links are
tight.
19. Boom up slightly using the Drum 4 thumbwheel on the
remote control to compress the boom stops (2, View C)
and remove the boom hold-back pins (3, View B) from
the working holes (W).
20. Install the hold-back pins (3, View B) in the storage holes
(S).
21. Turn OFF the SYNC switch on the remote control.
22. Lower the boom butt into the working range.
Disassemble Crane Counterweight
To disassemble the crane counterweight, reverse the
assembly steps on page 4-25
.
CAUTION
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.
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