Manitowoc National Crane NBT30H-2 Service Manual

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National Crane 03-20-2019 Control # 613-06 9-27
NBT30H-2 SERVICE MANUAL CRANE INSTALLATION
1. Put the test unit on a firm level surface. Place cribbing
under the outrigger floats and RSOD feet.
2. With the boom in the rest, raise and level the machine up
on the outriggers with all tires clear of the ground
according to procedures outlined in the Operator’s
Manual. Set the front jack (if equipped).
3. The loads listed in the Load Chart that are not in the
shaded area are limited by stability. To determine if the
machine is stable with an 85% tipping factor, it is
necessary to lift stability test loads at 1.18 times the
rated load.
NOTE: The stability test is done with no jib stowed on the
side of the boom. Remove the jib from the boom
before the start of the stability test.
The weights listed in the Stability Test Table below verify that
all rated loads on the load chart can be safely lifted.
EXAMPLE 1: NBT30H-2, 100 ft Boom
Test load start position over the back
• Boom Length: 13.4 m (44 ft)
• Rated Radius: 9.1 m (30 ft)
• Rated Load 5805.9 kg (12,800 lbs)
• Stability Test Load (no jib stowed):
12,800 x 1.18 = 6851.1 kg (15104 Ib)*
EXAMPLE 2: NBT30H-2, 110 ft Boom
Test load start position over the back
• Boom Length: 14 m (46 ft)
• Rated Radius: 10.6 m (35 ft)
• Rated Load 4286.4kg (9450 lbs)
• Stability Test Load (no jib stowed):
9450 x 1.18 = 5058.0 kg (11151 Ib)*
*Includes weights of slings and hook block.
NOTE: Be sure the weights lifted are accurate. A 1%
increase in load weight can result in a 10%
increase in the required counterweight.
4. Do the following for each test position listed in the
Stability Test Table.
a. Assemble the first test load as listed for the test
position in the stability test table. Place the test load
next to the crane.
b. Measure the rated radius from the center line of
rotation out from the crane as specified for the test
position. Mark the position.
c. Extend the boom to the boom length specified for
the test position.
d. Lift the load slightly off the ground. (about 6 inches).
e. Slowly boom down and hoist up until the test load
reaches the rated radius position. Do not exceed or
allow the load to swing out past the rated radius.
f. Slowly rotate the load throughout the work area.
If the test load can be kept from contacting the ground at
the stability radius, the unit is stable over the rear of the
unit.
5. If unit is unstable rotating, counterweight needs to be
added.
6. Repeat step 4 for all test loads in the Stability Test Table
for the model boom that is on the crane.

Manitowoc National Crane NBT30H-2 Specifications

General

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