2-2
NATIONAL CRANE 900A SERIES
Stabilizers – Extend/Retract
– Operate the lever
to
EXTEND to move beams out and to RETRACT to move
beams in.
Outriggers
– Operate the lever to UP to raise the
outrigger legs. Operate the lever to DOWN to lower the
outrigger legs.
Foot Throttle
– Depress the foot throttle to accel-
erate the truck engine speed. Release to return to idle
speed. Increasing truck speed increases operating
speed.
Kill Switch
– Operate the switch to kill the truck
engine under emergency conditions. Switch must be re-
set to on to operate truck from cab.
Horn
– Operate horn button to warn fellow workers
on construction site of pending movement of crane.
Pressure Gauge
– Observe pressure gauge while
booming up or down at end of stroke to determine sys-
tem pressure. Note: LMI required on cranes with jibs
and/or man baskets.
LMI Display Console
– Acts as interface between
operation and load moment system. It’s used to import
operating conditions and display boom and load infor-
mation. Refer to LMI manual in this owners manual.
LMI CPU
– Processes load information to give op-
erator crane capacities and boom information. Refer to
LMI manual in this owners manual.
ATB Light
– Indicator light illuminates when a two
block condition is detected.
Override Key Switch
– Turn key switch to enable
or disable HCAS and ATB override. Some units may be
equipped with a Manual Reset Valve option that does
not have Override Key Switch.
Capacity Chart
– This chart shows capacities of
crane at various operating areas and winch capacities
with appropriate reeving.
Boom Angle Indicator
– Located on either side of
the base boom section and used to determine main
boom angle with respect to horizontal. For reference
only.
Boom Length Indicator
– Located on either side
of the second boom section. The letters on the interme-
diate boom lengths correspond to the letters on the ca-
pacity chart. The length indicators are used to define
boom length and with the capacity chart and load radius
are used to determine the maximum loads that may be
safely lifted. Actual radius must be measured from the
centerline of rotation.
Load Radius
– Horizontal distance from the center
of rotation of the turret to the center of the loadline hook
or load with the load suspended. Use boom angle and
boom length as a reference to determine loadline or
load radius. When lifting maximum rated load, always
know the weight of the load and measure the radius
with the load suspended.
OPTIONAL HCA SYSTEM
Note: HCA system cannot be used with jibs and/
or man baskets.
HCAS Load Range Gauge
– Aid in determining
the load condition of crane. The gauge has three colors
on the dial face: (1) Green – OK; (2) Yellow – Caution;
and (3) Red – Overload. Do not use the Load Range
Gauge with a jib. Refer to “Hydraulic Capacity Alert
System” for more information
HCAS Overload Light
– Indicator light illuminates
when HCAS detects crane overload and boom down,
extend out and winch up functions disabled.
ATB Light
– Indicator light illuminates when a two
block condition is detected.
Override Key Switch
– Turn key switch to enable
or disable HCAS and ATB override. Some units may be
equipped with a Manual Reset Valve option that does
not have Override Key Switch.
Override Button
– With Override Key Switch in on
position, depress button to override HCAS and ATB sys-
tem. Do not use override to continue lifting operations
in an overload or two blocked condition.
Reference Only
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