Manitowoc National Crane NBT40-1 Series User Manual

National Crane 3-29-2018 Control # 610-00 4-17
NBT40-1 SERIES OPERATOR MANUAL OPERATING CONTROLS - CRANE
4
OUTRIGGER SETUP
Leveling of the Crane
It is essential that crane is level to within 1% of grade. If
equipment is out of level, an audible alarm will beep
indicating releveling is necessary. To properly level
equipment, refer to Outrigger Setup, page 4-17. An interlock
will not allow crane functions to operate during set-up.
Equipment Level Indicators Adjustment
Bubble level adjustment should be checked periodically; if it
is suspected that the equipment level indicator is out of
adjustment, verify and adjust the level indicator as follows:
1. Position crane on a firm, level surface.
2. Extend and set outriggers. Level crane, as indicated by
level indicator, using outriggers.
3. Place a miracle pointer level, carpenter level, or similar
type device on a machined surface such as turntable
bearing or bearing mounting surfaces.
4. Using outriggers, level crane as indicated on leveling
device used in previous step 3.
5. Using level indicator mounting screws, adjust level
indicator to show level.
Setting the Outriggers
1. Position outrigger floats directly out from each outrigger
to where outriggers will be properly extended.
2. If extending outrigger to mid-extend or fully extended
position, depress desired outrigger selector switch and
hold outrigger extend/retract switch to EXTEND.
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 four outrigger beams to one of three
proper positions (fully retracted, mid-extend, fully
extended), depress the desired Stabilizer Switch on the
Outrigger Selector Panel and hold Outrigger Extension/
Retraction Switch to EXTEND. The appropriate
stabilizer begins to move.
Extend each jack, positioning float as necessary, until
locking levers of float engage jack cylinder barrel.
NOTE: More than one stabilizer can be extended at a time.
4. With each jack float firmly touching ground, extend front
stabilizers approximately 8 to 10 cm (3 to 4 in). Extend
rear stabilizers approximately 8 to 10 cm (3 to 4 in).
5. Repeat step 4 until all wheels are clear of ground and
crane is level as indicated by bubble level indicator
(Figure 4-13). If it is suspected that bubble level
DANGER
Do not operate outriggers unless they are visible to either
operator or a designated signal person to avoid crushing
injury. Contact with moving outriggers can result in death
or serious injury.
DANGER
Do not operate outriggers unless they are visible to either
operator or a designated signal person to avoid crushing
injury. Contact with moving outriggers can result in death
or serious injury.
!
!
CAUTION
Possible Equipment Damage!
Always depress one of the outrigger selector switches
before positioning outrigger extend/retract switch to
extend or retract. Failure to do this may cause a hydraulic
lock against individual solenoid valves, preventing them
from opening.
DANGER
Electrocution Hazard!
To avoid death or serious injury, keep all parts of this
machine, rigging, and materials being lifted at least 20
feet away from electrical power lines and equipment.
DANGER
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 aerial lift unless outriggers are fully extended.

Manitowoc National Crane NBT40-1 Series Specifications

General

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