Manitowoc 2250 User Manual

Reference Only
Manitowoc Published 06-24-16, Control # 241-01 4-55
2250 OPERATOR MANUAL SETUP AND INSTALLATION
4
Raising and Lowering Gantry with Fully
Rigged Boom
Requirements for Raising and Lowering Gantry with
Fully Rigged Boom
See Figure 4-30 for more information.
o The crane is on a firm level surface.
o For truck cranes, carrier is leveled on extended
outriggers with tires off the ground.
o Fully rigged boom is resting on blocking at the ground
level.
o Equalizer is not pinned to the boom butt rails.
o Counterweights are installed.
Raising Gantry with Fully Rigged Boom
See Figure 4-30 for the following procedure.
1. Connect the crane setup remote control to the air valve
junction box on the left side of the rotating bed.
2. Turn on the cab power switch and start the crane’s
engine.
3. Select and confirm the Setup mode with the crane mode
selector.
4. Fully extend the gantry cylinders with the switch on the
remote control to raise the gantry to the intermediate
position.
5. Disengage the backhitch pins with the switch on the
remote control. Hold the backhitch pins switch in the
disengaged position until the contrasting paint color is
visible on the lower backhitch straps.
6. Boom up to raise the gantry.
NOTE: The backhitch lower straps are painted a
contrasting color (see View B) to alert the operator
when the backhitch is approximately 152 mm (6 in)
from being fully extended.
Watch the backhitch while raising the gantry. Slow
down the boom hoist speed when the contrasting
color is reached.
7. Raise the gantry until the boom is 76 to 102 mm (3 to 4
in) off the blocking. Raising the boom off the blocking will
ensure that the backhitch is fully extended.
8. Backhitch pins will automatically snap into engagement
with the upper holes. Stop raising the gantry when the
backhitch is fully extended.
9. Visually check that both pins are fully engaged. If either
pin fails to engage, determine the possible cause of the
problem:
• Pin damaged
• Air/electric fault
10. Lower the boom onto the blocking.
11. Fully retract the gantry cylinders with the switch on the
remote control.
12. Select and confirm the desired operating mode with the
crane mode selector.
13. Unplug the crane setup remote control from the junction
box and store the remote control.
Lowering Gantry with Fully Rigged Boom
See Figure 4-30 for the following procedure.
1. Connect the crane setup remote control to the air valve
junction box on the left side of the rotating bed.
2. Turn on the cab power switch and start the crane’s
engine.
3. Select and confirm the Setup mode with the crane mode
selector.
4. Fully extend the gantry cylinders with the switch on the
remote control.
DANGER
Tipping Hazard!
Avoid death, serious injury, and tipping the crane. For
truck cranes, do not attempt to the lower boom to the
ground or raise the boom from the ground until the
outriggers are extended.
CAUTION
Gantry or Boom Damage!
Do not attempt to raise the gantry until the gantry cylinders
are fully extended. Structural damage to the gantry or
boom will occur.
CAUTION
Gantry Damage!
Make sure the gantry cylinders are fully extended.
Cylinders must be used to fully lower the gantry.
Attempting to fully lower the gantry with the boom hoist
rigging will cause the gantry to fall violently. Structural
damage to the gantry or the boom will occur.

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English