NBT50 OPERATOR MANUAL CONTROLS AND OPERATING PROCEDURES
National Crane Published 03-23-2018 Control # 243-14 3-5
Outrigger Beam Selector Switch
The outrigger beam selector switch (1, Figure 3-2) is used to
operation the front or rear outrigger beam on the same side
of the crane the ground control is located.
Extend/Retract Switch
The extend/retract switch (2, Figure 3-2) will operate both
the outrigger beams or the jacks.
After pushing the desired selector switch, pushing the
extend/retract switch energizes the control solenoid to allow
hydraulic fluid to flow through the control solenoid valve and
the individual solenoid valve and move the selected compo-
nent in the desired direction. In addition, when the switch is
put to either position, a signal is sent to the engine ECM to
increase engine speed above idle for operation of the outrig-
gers.
Center Front Stabilizer Switch
The center front stabilizer switch (3, Figure 3-2) is located in
the center of the outrigger control panel. It must be used with
the extend/retract switch to control the operation of the cen-
ter front stabilizer. The center front stabilizer will retract auto-
matically when any of the other four jacks are retracted;
therefore, it must be reset if lifting is to be continued.
Jack Selector Switch
Use the jack selector switch (4, Figure 3-2) to indicate which
jack you desire to operate.
Emergency Stop Switch
There is an emergency stop switch (5, Figure 3-2) on the
outrigger controls on each side of the carrier. Pressing either
switch shuts down the engine.
NOTE: Only use the emergency stop switch in the case of
an emergency to shut down the engine; do not use
the emergency stop switch regularly as a means of
turning off the machine.
FIGURE 3-2
7459-4
1
245
4
3
Item Description
1 Outrigger Beam Selector Switch
2 Extend/Retract Switch
3 Center Front Stabilizer Switch
4 Jack Selector Switch
5 Emergency Stop Switch
6 Level Indicator
6
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