Manitowoc Published 12-10-19, Control # 258-05 3-25
MLC90A-1/MLC100-1 OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
Other Operation Aids
Boom Angle Indicator
The boom angle indicator (Figure 3-3) is located on the
boom butt and is visible through the right side cab window.
The indicator shows the angle of the boom in degrees above
horizontal.
NOTE The boom angle can also be viewed in the RCL/RCI
Display or in the Main Display.
Crane Capacity Beacon (Optional)
The purpose of the crane capacity beacon is to alert
personnel in the vicinity of the crane to the degree at which
the crane is operating within its rated capacity:
• Green Beacon ON = Crane’s rated capacity is at a safe
level.
• Amber Beacon ON = Crane’s rated capacity is
approaching the maximum level.
• Red Beacon ON = Crane’s rated capacity has been
exceeded.
The beacon colors correspond to the colors shown in the
rated capacity bar or triangle in the RCL/RCI Display.
Crane Level
Indicates crane levelness from front to rear and from side to
side. The level is mounted on the right-front wall of the
operator cab (Figure 3-4
). The crane is level when the
bubble is centered in the circle. The crane is one degree out
of level when the bubble is touching the outside edge of the
circle.
NOTE Optionally, crane pitch, roll, and levelness can be
monitored in the Crane Position Bar of the Main
Display Working Screen. See Main Display
Operation Manual for instructions.
Swing and Travel Alarm
The swing and travel alarm is mounted on the front of the
rotating bed. It is a dual-tone, interrupted alarm that sounds
when the swing or either travel control handle is moved in
either direction from off. The alarm turns off when the control
handles are moved to off.
WARNING
Overload Hazard
Use the boom angle indicator only as a guide to position
the boom near the angle corresponding to the radius for a
given load.
In all cases, radius shall govern the capacity. Exceeding
the radius given in the capacity chart can result in tipping
or structural damage.
Figure 3-3. Boom Angle Indicator
WARNING
Crane Tipping Hazard
Unless otherwise specified on the capacity chart, perform
all crane operations with the crane level to within one
percent of grade in all directions — 0,3 m in 30 m (1 ft in
100 ft); otherwise, the crane could tip.
Figure 3-4. Level
Bubble — Shown
Approximately One-Half
Degree Out of Level
Circle
P2361