SETUP AND INSTALLATION 2250 OPERATOR MANUAL
4-54
Published 06-24-16, Control # 241-01
8. Continue to raise the boom butt (boom up). The
backhitch pins will automatically snap into engagement
with the upper holes. Stop raising when the backhitch is
fully extended.
9. Visually check that both pins are fully engaged. If either
pin fails to engage, raise the boom butt slightly with the
boom hoist control to engage the pin.
10. Fully retract the gantry cylinders and the boom butt
handling cylinder with the switches on the remote
control.
11. Lower the boom butt to the desired position, with the
boom hoist 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 Boom Butt
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 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.
5. Raise the boom butt with the boom hoist control (boom
up) until the physical boom stops are approximately
25 mm (1 in) from bottoming out (see View A).
6. Disengage the backhitch pins with the switch on the
remote control. Hold the backhitch pins switch in the
disengaged position until the gantry has been lowered
onto the gantry cylinders.
7. Visually check that both pins are disengaged. If either
pin fails to disengage, raise the boom butt slightly with
the boom hoist control (boom up) to disengage the pin.
It may be necessary to depress the bypass switch in the
crane cab while performing this step.
8. Boom down to lower the gantry until it comes to rest on
the gantry cylinders.
9. Fully extend the boom butt handling cylinder with the
switch on the remote control.
10. Lower the boom butt onto the boom butt handling
cylinder and lower the boom butt to the ground with the
cylinder. Pay out the boom hoist wire to keep the rope
slack as the boom butt lowers.
11. Retract the gantry cylinders with the switch on the
remote control to lower the gantry until the cylinders are
fully retracted. Pay out the boom hoist wire rope to keep
the rope slack as the gantry lowers.
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.
CAUTION
Equipment Damage!
Do not allow the boom stop tubes to bottom out. Damage
to the boom stop tubes and boom butt will occur.
DANGER
Falling Attachment Hazard!
The gantry and butt can fall violently, causing death or
serious injury. Do not disengage the backhitch pins until
the backhitch is tensioned.
CAUTION
Boom Butt Damage!
Use care while raising the boom butt. If either backhitch
pin fails to engage before the physical boom stops bottom
out, stop and correct the problem—damaged pin or air/
electric fault.
Overtensioning the boom rigging can result in structural
damage to boom butt.
CAUTION
Equipment Damage!
• Watch the boom stop tubes while the gantry rises.
• Do not allow the boom stop tubes to bottom out.
Damage to the boom stop tubes and boom butt will
occur.
DANGER
Crush Hazard!
Avoid death or serious injury. Do not lower the boom butt
to the ground with the boom hoist control. The boom butt
will lower partway, the gantry will rise, and the boom butt
and gantry will fall violently.
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