Manitowoc Grove RT530E-2 Operator's Manual page 89

RT530E-2 OPERATOR'S MANUAL
The load chart is divided into capabilities limited by crane
structural strength and stability which is shown by a bold line
across the chart. Structural strength limits are above the line
and stability limits are below the line.
The left column is the load radius, which is the distance from
the axis of the crane rotation to the load center of gravity. The
top row lists various boom lengths from fully retracted to fully
Another important section is the range diagram. The range
diagram shows the operating radius and tip height that can
be achieved at a given boom length and angle. If the
operator knows the radius and tip height required for a
specific lift, the angle and boom length can quickly be
determined from the range diagram. Or if he knows the boom
length and angle, he can quickly determine the tip height and
operating radius.
A lifting diagram is included for over-side, over-rear, and
over-front lifting areas. The lifting area diagram shows that
the locations of the outrigger jack cylinders in the full
extended position are used to mark the boundaries of the
lifting areas.
Another section contains notes for lifting capacities. Be sure
to read and understand all notes concerning lifting
capacities.
The load chart also gives weight reductions for Manitowoc/
Grove load handling devices such as hookblocks, overhaul
balls, boom extension sections, etc., which must be
GROVE
OPERATING CONTROLS AND PROCEDURES
extended (with swingaway extension). The number at the
intersection of the left column and top row is the total load
limit for that load radius and boom length. The number in
parentheses below the total load limit is the required boom
angle (in degrees) for that load. The lower weight limit for the
2 boom lengths should be used.
BOOM ANGLE
HORIZONTAL
OPERATING RADIUS
TERMS TO KNOW
considered as part of the load. The weight of any other load
handling devices such as chains, slings, or spreader bars
must also be added to the weight of the load.
NOTE: The information in the following paragraph is an
example of how to compute a lift. The numbers
used in the example may not coincide with the load
chart in the crane cab.
Problem: A concrete beam weighing 2268 kg (5000 lb)
needs to be lifted to a height of 9.1 m (30 ft) at a radius of
15.2 m (50 ft) (maximum). The range diagram indicates the
boom must be extended to 18.9 m (62 ft) in order to reach a
height of 9.1 m (30 ft) at a radius of 15.2 m (50 ft).
First we need to check the crane for load handling devices.
In our example, the crane is equipped with a auxiliary boom
nose (rooster sheave) and a five ton overhaul ball. The
rooster sheave is 50 kg (110 lb), and the overhaul ball is
78 kg (172 lb) for a total of 128 kg (282 lb). The lift requires
slings and spreader bars weighing 159 kg (350 lb) which
Published 5-3-2016, Control # 555-02
AXIS OF ROTATION
4605
3
FIGURE 3-9
3-19