National Crane 03-20-2019 Control # 613-06 3-7
NBT30H-2 SERVICE MANUAL ELECTRIC SYSTEM
DIRECTIONAL CONTROL VALVE
SOLENOIDS
The directional control valve (DCV) manifold is used to
control the mode of operation of the valve. See Directional
Control Valve, page 2-14 for a description of the DCV
operation.
OUTRIGGER MANIFOLDS
There are two outrigger manifolds located on the crane. The
front outrigger manifold is mounted on the center of the front
outrigger box (Figure 3-6) and the rear outrigger manifold is
mounted on the rear outrigger box (Figure 3-7).
Front Outrigger Manifold
The solenoids on the front outrigger manifold (Figure 3-6)
control the selection of the front outrigger components, front
center jack (SFO), the extend and retract functions of all
outrigger components.
The solenoids on the front outrigger manifold provide the
following functions:
• The center front jack (4) solenoid extends or retracts the
SFO when energized. Any time the retract switch on the
outrigger control is depressed, the SFO is retracted first.
• The extend solenoid (8) controls the extend functions for
all outrigger components.
• The retract solenoid (9) controls the retract functions for
all outrigger components.
• Solenoids (3) (5) and (6) (7) control the front outrigger
components. See Figure 3-6 for solenoid identification.
Directional
Control Valve
FIGURE 3-5
8730
Pilot Manifold
Valve
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