NATIONAL CRANE Published 11-01-2020 Control # 710-00 4-25
NBT60XL OPERATOR MANUAL SET-UP
5. While watching the display, rotate superstructure so the
boom is positioned over the rear of the crane. Pull the
House Lock handle on the console to engage the house
lock. Using the house lock will assist in aligning the
counterweights. For more information, see House Lock,
page 3-12.
The Counterweight Removal Slew Position Indicator
(yellow arrows) (1, Figure 4-17) appears in the RCL
display, which indicates the rear of the superstructure is
nearly directly above the Removable Counterweight
stowed on the carrier deck.
Ensure vertical alignment of the superstructure to
counterweight with the optional rear view camera or by
leaving the cab and performing a visual inspection. If
necessary, return to cab, retract the house lock, and
rotate superstructure until alignment is achieved.
6. Remove left and right superstructure pins (4 and 5,
Figure 4-18) as necessary from the counterweight.
7. Remove left and right pins that secure the counterweight
to the carrier deck.
8. Using the counterweight control panel (Figure 4-16)
located on either side of the superstructure, lower the
counterweight cylinders. For more information, see
Lowering the Counterweight Cylinders, page 4-24.
9. Attach the counterweight to cylinders using
counterweight pins (6, Figure 4-18).
10. Using the counterweight switch panel, fully raise the
counterweight cylinders. For more information, see
Raising the Counterweight Cylinders, page 4-24.
NOTE: The length of the left side superstructure
attachment pin (5) is approximately 22 in
(558 mm). The length of the right side
superstructure pin (4) is approximately 13 in
(330 mm).
11. Secure the top counterweight to right side of
superstructure using superstructure attachment pin (4,
Figure 4-18).
12. Secure the top counterweight to left side of
superstructure using superstructure attachment pin (5).
NOTE: It may be necessary to jog the cylinders up and
down to install the superstructure attachment pins.
13. Adjust three bolts (1) to level the counterweight and
eliminate any relative movement between counterweight
and superstructure. Use the jam nuts (2) to lock the bolts
into position.
FIGURE 4-17
7623-20
1
Illustration for reference only. Your
crane may be different.
DANGER
Ensure that all mounting pins are properly installed and
locked during and after operating the counterweight
removal system.
Clear all personnel from the counterweight and
superstructure area when mounting or removing the
counterweight(s).
Fo
r
Reference
Only
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