Manitowoc National Crane NBT30H-2 User Manual

National Crane Published 03-18-2019 Control # 582-04 4-3
NBT30H-2 OPERATOR MANUAL SET-UP
4
EXTENSION SAFETY INFORMATION
1. The anti-two-block switch weight and cord must be
attached to the extension when deployed.
2. Do not lift the load with the main boom when the
extension is pinned on the tip of the main boom.
3. Operate with extension by boom radius when main
boom is fully extended. If necessary, increase boom
angle to maintain loaded radius.
When radius is between points listed on capacity chart,
the load shown at the next longer radius shall be used.
4. Operate with extension by boom angle when main boom
is not fully extended. Do not exceed rated extension
capacities at any reduced boom lengths.
When angle is between points listed on capacity chart,
the load shown at next lower boom angle shall be used.
5. Ensure extension is stowed correctly (Figure 4-3):
a. Removal of swing around pins, C1, without proper
installation of stow pin A and extension swing pin B,
may allow extension to fall off.
b. Extending boom with extension stowed and failure
to remove swing pins, C1, will damage unit upon
extension.
6. Only swing extension into working or stowed position
when boom is horizontal, stow pin A and extension
swing pin B, are removed and swing pins, C1, are in
place. Extension could swing uncontrollably if boom is
not horizontal.
7. Crane shall be fully set up according to proper set-up
procedures outlined previously when stowing or
unstowing extension.
8. Operate boom and turn functions very slowly and
carefully when using extension since extensions can
increase boom length by 50%.
9. Area where extension swings around must be clear of
obstructions and power lines when stowing and
unstowing extension.
10. Do not extend/retract boom unless boom is horizontal
when stow pin A and extension swing pin B are removed
during stowing or unstowing procedures.
11. Always put spring clips in pins to ensure that they will
stay in place.
12. When the extension is stowed, the boom can not be fully
retracted if a boom tip attachment option is installed.
Also, on manually extendable extension options:
1. Extension retaining pin E must always be installed when
operating.
2. All swing around (stow and unstowing) operations shall
be done with extension retracted and pinned.
3. Extendable section may slide out of 1
st
section
extension when pin E is removed. Keep personnel clear
of area.
FIGURE 4-2
CAUTION
Eye Injury Hazard!
Use safety glasses when striking pins with a hammer.

Manitowoc National Crane NBT30H-2 Specifications

General

Brand	Manitowoc
Model	National Crane NBT30H-2
Category	Construction Equipment
Language	English