Manitowoc National Crane NBT40-1 Series User Manual

National Crane 3-29-2018 Control # 610-00 6-5
NBT40-1 SERIES OPERATOR MANUAL SET-UP
6
3. Two section jib - Install extension retaining pin (E,
Figure 6-1 through the 1
st
and 2
nd
section jib assembly
and install spring clip.
4. Remove loadline from jib sheave case. Place loadline in
area to avoid possible damage from stow procedure.
5. Disconnect anti-two-block wire connector at rear of the
jib extension. Re-connect anti-two-block switch
connector on boom tip. Move weight/chain assembly to
boom tip see Figure 6-10.
6. Attach tag line to sheave case end of jib.
7. Remove spring clips from pins (C2, Figure 6-1) on both
upper and lower jib ears.
8. Remove jib swing pin (B, Figure 6-1) from the boom
nose.
9. Remove pins (C2, Figure 6-1) from upper and lower jib
ears. Do not remove (C1) pins at this time. C1 pins will
be used as a pivot point to swing jib into stow position. A
slight hammer strike may be necessary to remove pins.
Always use proper eye protection during this step.
10. Raise the boom to the horizontal position.
11. Extend boom approximately 1 foot (.3m).
12. Using tag line attached to jib sheave case, slowly swing
jib into stow position (parallel with 1
st
section boom),
Pins (C1, Figure 6-1) are the jib pivot points during this
operation.
:
13. Install jib swing pin (B, Figure 6-1) with spring clip
through jib ear and boom sheave case holes. This pin
will keep the jib assembly in line (parallel) with the I
st
section boom.
NOTE: Jib swing pin (B, Figure 6-1) does not retain the jib
in its stowed position on the I
st
section boom.
14. Using boom telescope function, slowly retract boom.
The jib stow bracket (H, Figure 6-1) on the side of the jib
will engage the side stow bracket (D) on the side of the
1
st
section boom; first lifting the jib and then engaging
the jib side stow bracket (H) and the stow bracket (D)
completely upon full retraction of the boom.
15. Install stow pin (A, Figure 6-1) with spring clip into the jib
stow bracket (H) on the jib. Complete engagement of
stow brackets and proper installation of pin A is critical
for secure jib stow attachment.
16. Remove pins (C1 Figure 6-1) from upper and lower jib
ears.
NOTE: A slight hammer strike may be necessary to install
pins. Always use proper eye protection during this
step.
17. Reinstall loadline over boom sheave case.
JIB REMOVAL
Should jib removal from the boom become necessary,
proceed as follows:
1. Unstow and swing jib into position on the boom tip
according to Steps 1 - 10 in the preceding jib deployment
section.
2. Using an assist crane, support and raise the jib at its
balance point and remove the two swing around pins.
Jib is now free of boom.
3. To install, proceed in reverse order of removal.
When the jib is stowed on side of crane, always leave the
ram and handle sleeve of the jib jack pushed all the way
down to reduce exposure to rusting.
Jib Maintenance
1. Lubricate as outlined in SECTION 5.
2. Check for free rotation of jib sheave daily when using jib.
CAUTION
Use caution when swinging jib to avoid unnecessary
impact with 1
st
section boom.

Manitowoc National Crane NBT40-1 Series Specifications

General

Brand	Manitowoc
Model	National Crane NBT40-1 Series
Category	Construction Equipment
Language	English