These limitations are incurred because of heat build up in the motors and the declining charge of the batteries. Duty Cycleġ2V DC powered electric cranes have a limited duty cycle as per S.A.E. As a result there is no limitation by mechanical or electrical stop on the crane's rotation. There is either an electric or electric/hydraulic swivel that allows this important feature. Liftmoore cranes typically have unlimited rotation. This limitation must be considered when positioning the truck to perform the work at hand. Many crane manufacturers claim to have 360 degree rotation, however, the rotation may be limited at 375 or 400 degrees at which point the rotation will stop and must be reversed. radius the maximum load is 72,000 divided by 20 ft. radius the maximum load is 72,000 divided by 12 ft. this is the maximum load radius with this load.Īt a 12 ft. Example of moment rating calculationsĪ crane with a max lift capacity of 10,000 lbs. The amount of weight to be lifted, includes all rigging used, including the travel block any chains or slings and the hook. This is a measurement from the center of the crane's rotation axis to the center of the load on a horizontal plane. Moment rating is a mathematical equation determined by the WEIGHT times the LOAD RADIUS. Understanding this is essential to getting you the crane you A cranes capacity at a particular load radius is determined by its moment rating. Liftmoore does not recommend purchasing a crane for use at its maximum lifting weight.

How often will the lift be made? Maximum CapacityĪdvertised maximum capacity is a statement of the maximum lift capacity of the crane. How far out from the center of rotation is the load?ģ. The three most important factors that need to be known.Ģ.

Mobile crane radius