Intersect the two columns and you will get the available line pull on the crane.To determine the available line pull first determine the type of wire rope being used, then how many parts of line.This illustration represents the available line pull and maximum winch speed for the crane.The amount of rope a drum will hoist for a given layer. The illustration below shows the dimensions of the crane, this type of information would be necessary for transportation purposes and for setting the crane up in tight areas. Even though these important items for cranes have many other uses, keep in mind the primary purpose of a jib, fly, or a boom extension is to increase the overall height a load may be lifted. This crane load chart on the left is a typical load chart for a Link Belt to use when you are lifting with the fly. These are pretty much the same things, they just could not agree on a name. Manufacturers refers to the pinned boom extension on their crane chart as a jib, fly, or boom extensions. Whether you are using a Grove load chart, a Terex load chart or a Link Belt load chart you might see different terms used for the boom extension. By selecting the jib and the boom angle you will be able to determine the gross capacity lifting on the jib. The gross capacities in the crane chart below are to be used when lifting with either the 24ft or 40 ft jib. The following are an example of capacity deductions in the cranes load chart. These items represent the amount of weight you would deduct from the gross capacity to determine the net capacity. GROSS CAPACITY - CAPACITY DEDUCTIONS = NET CAPACITY Make sure to understand what the manufacturer determines are capacity deductions. Remember there are many variations, depending on the manufacturer of the crane. Effective weight of Jib (Stowed or erected and not used).Weight of the Headache ball or overhaul ball.The Gross Capacity must include the weight of anything and everything that is mounted or stowed on the boom of the crane or hanging from the boom tip. The maximum load must never exceed the crane's Net Capacity!
The actual load the crane can lift is referred to as the "Net Capacity". The values given in the charts are "Gross Capacities" or "Rated Capacities". The capacities listed in a cranes load chart are not the actual loads that can be lifted on the hook. The "Stowed jib deductions" row is what you would deduct if the jib was stowed on the base of the boom for the particular boom length. The gross capacity of this crane can be determined by either following the radius column and interesting boom length, or following the boom angle column and intersecting the radius or boom length column. Loaded boom angle (means the boom's angle and radius is being measured with the boom loaded with the weight indicated in the chart) The numbers in the left column represent operating radius The numbers on top row represent boom lengths of the crane This chart illustrates the gross or rated capacities of a crane. Ignoring these differences may lead to the overturning or structural failure of the crane. Whether you are operating a boom truck such as a Terex, National, Manitex, Pioneer, or Altec, a rough terrain crane such as a Grove, Link-Belt, Manitowoc, Kato, or Tadano, it is important to keep in mind that though many cranes have similarities in their load charts, they also have many differences. With all of the different crane manufacturers out there, it is imperative that the crane's load chart be well understood. A crane's load chart is the most important resource a crane operator should know for ensuring crane safety, and for determining what a particular crane is capable of lifting.
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