2-15
C A U T I O N
A capacity load may be carried on the boom, or a capacity load may be carried on the
deck, but not at the same time. The total of the percent of deck load and the percent
of boom load must not exceed 100%. For example, if the boom load is 100% of its
capacity at its current load radius, the deck load capacity is 0%. If the boom load is
60% of the load rating for its load radius, the deck load capacity is 40% of maximum.
C A U T I O N
The OUTRIGGERS OUT & DOWN capacities of this crane are based on all outriggers
being FULLY SPREAD AND EXTENDED to a FIRM surface with no load on the tires.
The crane may tip at less than capacity loads if operated in the following manner:
A. Outriggers only partially spread or tires carrying some load. (If the rear axle can be
oscillated by hand, it is not loaded.)
B. Crane operated on a hill or sloping surface. Crane will tip at less than rated capacity if
crane is not level.
C. Outriggers extended to a surface that appears to be firm, but is unable to support the
outrigger pad at full rated loads. Examples of this type surface are:
1.
Thin or cracked blacktop or concrete.
2.
Dirt that appears dry and firm on top but is moist or unpacked beneath the
surface.
3.
Dirt with a frozen but thin crust.
CAPACITY EXAMPLE (See Boom Extension Capacity Example Page 2-21)
Refer to the IC-250 capacity chart on the preceding page. A load 6’ X 6’ X 6’ (1.5m x1.5m x
1.5m) and weighing 14,000 pounds (6350kg) is to be lifted onto the deck of the crane for
transport to a new location. We see on the chart that 9000 pounds (4080kg) is the maximum
load on one-part line, so the sheave block is required. The charts show the weight of the
standard sheave block to be 300 pounds (136kg). The rigger says that two slings are
required, weighing a total of 50 pounds (23kg). The total load is 14,000+300+50=14,350
(6350 + 136 + 23 =6509kg).
Looking at the 360° ROTATION, ON RUBBER column we see that we can lift
16,400 pounds (7440kg) at a 6-foot (1.8m) load radius. However, this radius is less
than the distance from the center of rotation to the center of the load, with the crane
parked next to the load, so the load cannot be lifted this way. This leaves the ON
OUTRIGGERS columns. The outriggers should always be used whenever possible
anyway. We see that we can lift up to 20,800 pounds (9770kg) at a 12-foot (13.5m)
load radius, either over the front or over the side. If possible, position the crane to lift
the load over the front. This is the best position for stability. Checking the chart, we
see that the load is within the deck load limit of 17,000 pounds (7700kg) and that
travel speed with the load must be limited to creep speed. Creep speed is less than
2 MPH (3km/h) and not to exceed 200 feet (60m) in a 30 minute period. This is an
approved relationship between load, tire pressure and speed.
REMEMBER, AS THE BOOM IS LOADED, DEFLECTION OF THE BOOM, TIRES,
ETC. WILL INCREASE THE LOAD RADIUS. SO BE CONSERVATIVE IN YOUR
CAPACITY ESTIMATE.
Summary of Contents for IC-250
Page 6: ...1 2 IC 250 3E DIMENSIONS...
Page 7: ...1 3 IC 250 3E TURNING DIMENSIONS...
Page 30: ...2 14...
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Page 51: ...3 9 IC 250 3E LUBRICATION CHART...
Page 58: ...3 16...
Page 59: ...3 17...
Page 68: ...3 26 BOOM CHAIN ADJUSTMENT...
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