2-13
W A R N I N G
The Rated Capacity Limiter can suddenly stop the boom lower and swing functions,
causing the load to bounce or swing. Use great care when handing a load near
capacity limits or near a two-blocking condition.
CRANE CAPACITY CHART DEFINITIONS AND RULES
:
The load radius is the horizontal distance from the centerline of boom rotation (the center of
the turntable when it is level), to the vertical load line with the load suspended. Because of
deflections of the boom and carrier, the load radius increases when a load is hoisted from its
resting place. The load radius may be measured with a measuring tape. If the desired load
radius falls between two load radii on the chart, it is recommended to use the load radius with
the lower capacity and not try to interpolate between the numbers.
Load capacity ratings on this equipment are given on the basis that operations are to be
conducted on firm and level terrain and in a safe environment. These capacity ratings are
reduced in proportion to the deviation from the prescribed conditions. Any unfavorable
environmental condition, such as soft, sloping or uneven terrain, high wind, or hazardous
surroundings constitutes a deviation.
The main boom capacities are given in direct relation to the radius at which the load is being
handled. Boom extension capacities depend on the boom angle as well as the load radius.
The capacities shown on the capacity chart are the maximum allowable at the indicated
radius. The greatest load that may be handled by the BMC IC-250 is 36,000 pounds
(16330kg), but only at a 6
-
foot (1.8m) radius and on outriggers. All variances of loads and
radii of handling are shown on the crane capacity chart. A metal chart is attached near the
operator's seat and a laminated chart is included in the literature compartment for the
express purpose of informing the operator when a load can or cannot be safely handled.
The capacities shown in the 360° ROTATION columns of the capacity chart apply to the
entire 36
0°
rotation of the boom and are maximum allowable at the indicated radius.
The capacities OVER FRONT are limited to the work area sectors shown on the placard.
Note that the 36
0°
rotation
capacities at some load radii are much less than the
OVER FRONT capacities. The least stable position of the boom is over the side of the
crane. Use great care when swinging a load from the front or rear of the crane toward the
side of the crane. The load must be known in order to assure that the crane will not tip.
N O T I C E
Under certain load conditions, torsion induced in the chassis can cause it to
twist. This may result in an opposite-side outrigger or tire lifting free from the
supporting surface. This is most likely to occur when the boom is positioned
over one corner of the machine. The condition does not indicate a loss of
stability when working within the limits of the capacity chart. Provided the
crane capacity has not been exceeded, operation may continue without
restriction.
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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