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NATIONAL CRANE
Published 11-01-2020 Control # 710-00
4-5
NBT60XL OPERATOR MANUAL
SET-UP
4
JIB OPERATION
The NBT60XL cranes can support the following jibs:
•
26 to 45 ft (7.9 to 13.7 meters) Telescoping Offset Jib
•
36.5 ft (11.3 meters) Offset Lattice Jib
Use the following procedures to deploy and stow the jib.
Deployment Procedure
NOTE:
Depending on the length of the jib being used, the
crane can be equipped with either a two section or
one section jib. Certain stowing instructions may
apply to only one or the other and will be noted so.
1.
Remove rope keeper pins from boom or auxiliary
sheave case and jib. Remove hook block and downhaul
weight. Remove loadline from boom and place in an
area to minimize possible damage. Remove the
auxiliary sheave case if installed.
2.
Using boom telescope function, fully retract boom.
3.
Using lift function, lower boom so that attachment pins (6
and 7, Figure 4-3) 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.
4.
Install right side attachment pins (6) in upper and lower
jib lugs, secure with retainer spring clips. These pins are
used as a pivot point to swing jib into the deployed
position.
5.
Locate the stowed position of left side attachment pins
(7). If in jib attachment holes or boom sheave case jib
holes, remove pins from storage location.
6.
Check that the jib is engaged on stowage brackets (front
and rear) with the stow pin (1) installed and fully seated
before removing the swing pin (5) from the boom nose.
7.
Remove jib swing pin (5) from top lug of jib.
8.
Using the lift function, raise the boom to the horizontal
position.
9.
Remove stow pin (1) and stow in hook bracket (3),
secure with spring clip.
10.
Attach tag line to sheave case end of jib.
11.
Using telescope function, slowly extend boom
approximately 30 cm (12 in). This procedure will pull the
jib out of the hook bracket (3).
12.
Using tag line, swing jib into deployed position.
13.
Install upper left attachment pin (7) and spring clip. A
slight hammer strike may be necessary to install pins.
Always use proper eye protection during this step.
14.
Use the alignment jack (10) to align lower left side
attachment pin (7).
a.
Remove the jack handle (11) from the boom
stowage bracket and check that the jack release
valve is closed.
b.
Extend the alignment jack (10) so that the lower left
pin holes (7) are aligned.
c.
Install the lower left side attachment pin (7) and
spring clip.
d.
Open the jack release valve and retract the jack
(10).
15.
Deploy the mast assembly. See
16.
Using hoist function, un-spool enough loadline to reeve
loadline over jib sheave case. Keep slight tension on
loadline to avoid bird caging of loadline on hoist drum.
17.
If not already done, remove mast assembly rope retainer
(11, Figure 4-4). Remove rope retaining pins and lock
pins (15) from the jib nose. Route loadline over mast
assembly (10) and jib sheave (16) and install keeper
(17). Install mast assembly rope retainer (11). Install the
jib retaining pins using lock pins (15). Install line block to
end of loadline.
18.
Remove A2B switch and weight/chain assembly and
install on jib tip, see Figure 4-10. Be certain to use
keeper provided with switch.
DANGER
Visually check all pin positions and make sure the jib is
fully retracted into side stow brackets, jib stow attachment
is secure, and all pins and spring clips are in their proper
locations. Failure to properly secure the jib during stowing
and erecting may allow the jib to fall. Serious personal
injury or death could result.
Always have at least one, if not both, of the following in
place at all times:
•
Side stow bracket completely engaged into stow
hook with stow pin A properly in place.
•
Both pins (6, Figure 4-3) in upper and lower jib holes
properly in place through mating holes on boom tip.
!
CAUTION
Use caution during this step. The jib is free to swing away
from the boom during boom extension.
!
Fo
r
Reference
Only
Содержание NBT60XL
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