A 25-ton truck-mounted hydraulic crane is being used on a constructionsite. The maximum horizontal distance from the center of rotation of thecrane to the hoist line of the crane when lifting a load of 9,000 lbs willbe 40 ft. Use Table 16.2 crane data to select the minimum-length boomrequired to safely hoist the load. TABLE 16.2 Lifting capacities in pounds for a 25-ton telescoping-boom truck crane*Lifting capacity (lb)tBoom length (ft)Load radius121520253035404550556065707531.550,00041,50029,50019,6004045,00039,00029,50027,00019,900 20,10014,5004838,70034,40034,400 30,00056647224,800 22,700 21,10020,10019,100 17,70014,700 14,700 14,800 14,80011,20011,30011,400 11,4008,8008,9009,0009,0007,2007,3007,3005,8005,900 6,0004,8004,9004,0004,0003,1008017,10014,20011,4009,0007,3006,0004,9004,0003,3002,7002,200*Specified crane capacities based on 85% of tipping loads.†The loads appearing below the solid line are limited by machine stability. The values appearing abovethe solid line are limited by factors other than machine stability.

Given: Crane type = 25-ton mounted hydraulic crane The distance from the center of rotation = 40 ft load lifting = 9000 lbs To find: The minimum length boom required to safely hoist the load.Solution: Table 16.2 - lifting capacities in pounds for a 25-ton telescoping boom truck crane. For a load radius of 40 ft to carry a weight of 9000 lbs. Boom length from 64 ft, 72 ft, and 80 ft is eligible. Then the loads appearing below the solid line are limited by machine stability. Therefore the minimum boom length to carry the weight is 64 ft.Answer The minimum length boom required to safely hoist the load is 64 ft.