Manitowoc National Crane NBT40 Series User Manual

3-14 Published 4-23-2018 Control # 239-11
OPERATING CONTROLS & PROCEDURES NBT40 SERIES OPERATOR MANUAL
OUTRIGGER SETUP
Proper Leveling of the Crane
ASME B30.5 specifies that if a crane is not level within 1% of
grade, the allowable capacities must be reduced. Therefore,
when lifting on outriggers, it is essential that the crane is level
to within 1% of grade. The bubble level that is provided on
the crane is calibrated to be accurate within 1% of grade.
To properly level the crane, the boom must be positioned
over the front of the crane, fully lowered to horizontal and
fully retracted (for cranes fitted with a boom rest, the boom
shall be stowed onto the rest). Raise and level the crane
using the outriggers; refer to Setting the Outriggers, page 3-
14.
A working crane may settle during lifting operations.
Frequently check the crane for level. When rechecking the
crane for level, the boom must be positioned over the front of
the crane, fully lowered to horizontal and fully retracted (for
cranes fitted with a boom rest, the boom shall be stowed
onto the rest). If necessary, relevel the crane using the
procedures under Setting the Outriggers, page 3-14.
Bubble Level Adjustment
The bubble level adjustment should be checked periodically;
if it is suspected that the bubble level indicator is out of
adjustment, verify and adjust the bubble level as follows:
1. Position the crane on a firm, level surface.
2. Extend and set the outriggers. Level the crane, as
indicated by the bubble level indicator, using the
outriggers.
3. Place a miracle pointer level, carpenter level, or similar
type device on a machined surface such as the turntable
bearing or bearing mounting surfaces.
4. Using the outriggers, level the crane as indicated on the
leveling device used in step 3.
5. Using the bubble level indicator mounting screws, adjust
the bubble level indicator to show level.
Setting the Outriggers
1. Position the outrigger floats directly out from each
outrigger to where the outriggers will be properly
extended.
2. If extending the outrigger to the mid-extend or fully
extended position, depress the desired outrigger
selector switch and hold the outrigger extend/retract
switch to EXTEND. The appropriate outrigger beam
begins to extend.
NOTE: More than one outrigger beam can be extended at
a time. However, to ensure that each outrigger is
fully extended, repeat step 2 for each outrigger
after a multi-outrigger extension.
3. After deploying the four outrigger beams to one of the
three proper positions (fully retracted, mid-extend, fully
extended), depress the desired Stabilizer Switch on the
Outrigger Selector Panel and hold the Outrigger
DANGER
A deviation between displayed and actual values
indicates a malfunction and a RCL service representative
shall be called for repair and/or recalibration of RCL
system.
DANGER
Do not operate outriggers unless they are visible to either
the operator or a designated signal person to avoid
crushing injury.
!
!
CAUTION
Possible Equipment Damage!
Always depress one of the outrigger selector switches
before positioning the outrigger extend/retract switch to
extend or retract. Failure to do this may cause a hydraulic
lock against the individual solenoid valves, preventing
them from opening.
WARNING
Electrocution Hazard!
To avoid death or serious injury, keep all parts of this
machine, the rigging, and materials being lifted at least 20
feet away from electrical power lines and equipment.
WARNING
Tipping Hazard!
All four outrigger beams must be deployed to one of three
positions before beginning operation, which include fully
retracted, mid-extend, or fully extended; do not operate
the crane with the outriggers in any other position.

Manitowoc National Crane NBT40 Series Specifications

General

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