National Crane 3-29-2018 Control # 610-00 4-7
NBT40-1 SERIES OPERATOR MANUAL OPERATING CONTROLS - CRANE
lowered to horizontal and fully retracted and stowed onto
boom rest.
Interlock alarm will beep if crane settles outside of 1% of
grade during operations indicating releveling is necessary.
Operating controls will continue to function while crane is re-
leveled.
If necessary, relevel crane using procedures under Outrigger
Setup, page 4-17.
Equipment Level Indicators
Equipment has one primary and three secondary level
indicators. Primary level indicator is used to verify accuracy
of secondary level indicators.
Primary level indicator (7, Figure 4-1) is located forward of
turret bearing. Secondary level indicators are located in
outrigger control panels (6, Figure 4-1) and in ground control
cab (38, Figure 4-4).
There is an electronic level sensor located on top of
turntable bearing plate near lift cylinder trunnion (11,
Figure 4-1) which is used to monitor outrigger system
levelness of equipment. If equipment is not level within 1%,
outrigger motion alarm will sound until corrected and boom
functions will be disabled, See“Leveling of Equipment” on
page 2-6.
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