NATIONAL CRANE
Published 11-01-2020 Control # 710-00
4-7
NBT60XL OPERATOR MANUAL
SET-UP
4
:
14.
Install jib swing pin (5, Figure 4-3) with spring clip
through jib lug and boom sheave case holes. This pin
will keep the jib assembly in line (parallel) with the 1
st
section boom.
NOTE:
Jib swing pin (5, Figure 4-3) does not retain the jib
in its stowed position on the 1
st
section boom.
15.
Using boom telescope function, slowly retract boom.
The jib stowage bracket (2, Figure 4-3) on the side of the
jib will engage the hook bracket (3) on the side of the tele
1 (base) boom section, first lifting the jib and then
engaging the jib stow bracket (2) and the hook bracket
(3) completely upon full retraction of the boom.
Ensure boom is fully retracted.
16.
Install stow pin (1, Figure 4-3) with spring clip into the jib
stowage bracket (2) on the jib. Complete engagement of
stow brackets and proper installation of stow pin (1) is
critical for secure jib stow attachment.
17.
Remove right side attachment pins (6, Figure 4-3) from
upper and lower jib lugs. A slight hammer strike may be
necessary to remove pins.
18.
Reinstall loadline over boom sheave case.
NOTE:
When the jib is stowed on side of crane, always
leave the ram and handle sleeve of the alignment
jack pushed all the way in to reduce exposure to
rusting.
JIB REMOVAL
Use the following procedure to remove the jib from the boom.
1.
If necessary, disconnect A2B/RCL wire connector at
rear of the jib. Re-connect A2B/RCL switch connector on
boom tip. Move weight/chain assembly to boom tip
(Figure 4-10).
2.
If equipped, remove the anemometer assembly from the
end of the jib. Install the anemometer assembly at the
end of the boom. For more information, see
3.
Perform steps 2 to 11 in the deployment procedure to
position the jib at the boom tip. For more information,
see
NOTE:
When rigging the jib for the assist crane, refer to
the decal showing the jib balance point.
4.
Attach rigging to the jib and lift the jib with an assist
crane. With the assist crane supporting the jib, remove
the right side attachment pins (6, Figure 4-4) in upper
and lower jib lugs. Jib is now free of the boom.
JIB INSTALLATION
Use the following procedure to install the jib on the boom.
1.
Using lift function, lower boom so that right side
attachment pins (6, Figure 4-4) are easily accessible
from the ground.
NOTE:
When lowering the boom below horizontal, two
persons may be required. With the telescope
control in neutral, the boom may slide out when
below horizontal.
NOTE:
When rigging the jib for the assist crane, refer to
the decal showing the jib balance point.
2.
Attach rigging to the jib and lift the jib with an assist
crane. Position the jib at the boom nose so the right side
attachment pins (6, Figure 4-4) can be installed to
secure the jib to the boom nose.
3.
Install right side attachment pins (6) in the upper and
lower jib lugs. Secure the pins with retainer spring clips.
The right side attachment pins are used as pivot points
to swing the jib into stowed position. The jib is now
attached to the boom and ready to stow.
4.
Attach a tag line to the end of the jib.
5.
Remove the assist crane rigging as necessary to stow
the jib.
6.
Stow the jib on the side of the boom using steps 11 to 18
of the stowage procedure. For more information, see
CAUTION
Use caution when swinging the jib to avoid unnecessary
impact between the jib side plates or lacings and the hook
bracket on the boom base section.
CAUTION
Always use proper eye protection during this step.
Fo
r
Reference
Only
