2.5 MPH means the crane can be driven at this speed, or slower, with the tires at the
proper inflation pressure with the boom straight over the front.
STABILITY/ STRUCTURAL STRENGTH
Crane load ratings with an asterisk (*) beside them are based on the machine’s structural
strength. All other ratings are based on stability. Therefore, when lifting in an area where the
rated load is governed by strength, an overload can produce an abrupt failure. This may be
in the boom, outrigger beam, or elsewhere. For example, this is particularly true when the
operator does not know the weight of the lifted load or fails to account for the forces
necessary to unstick a load from the mud or the extra ice, snow, mud, etc. on the load.
In the stability zone, some operators foolishly attempt to determine if the crane can lift the
load by allowing the crane to tip. This can result in a tip over, particularly if the boom point
moves out to a greater radius than the load centerline, which it tends to do due to boom
deflection and machine tipping. In this condition, when the load comes free of the ground,
it swings out rapidly, endangering workmen and can pull the crane into a tip over condition.
Also, if the load is heavy enough and will not move and the boom point moves out far
enough, the rating can change back to structural with the associated abrupt failure
discussed above.
Therefore: CAUTION - Do not attempt to tip the machine to determine allowable
load.
MAXIMUM PERMISSIBLE HOIST LINE LOAD
By lifting with the boom or telescope cylinders, the crane can easily exceed the rated
capacity of the wire rope and even the breaking strength of the wire rope. It is mandatory
that wire rope utilized on the crane have adequate breaking strength as rated by the rope
manufacturer, be in good condition, and proper number of parts of line be used. For
inspection consult PCSA Std. No.4 and ANSI Standard B30.5 and the wire rope users manual.
Operating Instructions
108 P/N 12261-319 REVISED: August 2012
Courtesy of Crane.Market
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