To determine how much load the crane can safely handle you must also know the length of the boom (hydraulic cranes show boom lengths in a row at the top of the load chart), and the load radius of the suspended load (hydraulic cranes show radius in a column on the left side of the load chart). capacity for a two-part reeving will require more reeving prior to making a lift that exceeds 28,000 lbs. A reeving chart which indicates 28,000 lbs. How to calculate crane load capacity?ĭoes the crane have sufficient load hoist reeving? Reeving charts indicate the type of wire rope and the number of parts of wire rope required to lift loads. The combined information to this point will lead you to one or more pages within a load chart. Make certain you know the area where the load will be lifted from, the area the load will pass through, and the area the load will be placed.īase lifting capacities on the area with the least load rating according to the working area chart. Over what operating areas will the load be handled? Working Area charts define specific areas of the crane that relate to loading ratings.Īreas such as Over the Side, Over the Rear, Over the Front, and 360-degree Rotation lead you to specific load charts. What are the boom and jib/extension configurations? If the lift will be made with an extension or jib you must locate the load chart that provides ratings for these accessory devices.How much counterweight is installed on the crane?.How is the crane configured? Are the outriggers fully extended and set, partially extended and set, or will the lift be made on rubber tires?.There is specific information you must obtain prior to attempting to lift a load. Load charts have become increasingly complex. The crane load chart in the mobile crane industry is long past the days of a single page load chart. You just have to know what you’re looking for. Similarly, certain information will always be located within a crane’s load rating chart and notes. You do this because you know these controls must exist to operate safely.

You locate the speedometer and fuel gauge, then locate windshield wiper, outside mirror, and seat adjustment controls. Just as you may expect to find certain information when you enter an unfamiliar automobile. 4 How to calculate crane load capacity?Īn experienced crane operator enters the cab of an unfamiliar crane expecting to find certain information on the load chart.

20 ton lorry crane load chart