Operating the Vehicle Loading Crane to Load, Unload and Move Loads
Smooth control
Operate smoothly: take up slack, lift clear, then slew. Avoid sudden starts and stops, which create dynamic loads that can exceed the chart. Keep the load as close to the ground as practical while slewing, and never drag or side-pull a load. Use the tag line or rigger to control rotation. Watch the load, the hook, and the surroundings - maintain communication with the dogger throughout.
Load control and radius
As the boom extends or the load moves outward, capacity falls rapidly. Monitor the radius and the load moment indicator continuously. Keep the load within the chart for the actual configuration. Never exceed the rated capacity, and never use the crane to lift people unless the crane is specifically designed and rated for it.
Moving loads
For pick-and-carry, only travel with the load if the load chart permits it and the boom is in the specified travel position. Keep the load low, travel slowly, use a spotter, and avoid slopes and uneven ground. On public roads, stow the boom and secure the crane per the manufacturer's instructions.
Traps in questions
A frequent trap is a question about a load that "just needs a small side pull" - the answer is to reposition the vehicle. Another is slewing over people or a vehicle; the exclusion zone must be maintained. A third is assuming the load chart applies while travelling; pick-and-carry capacities are much lower.
Rule of thumb
Keep the load within 10% of the ground during slew where site conditions allow, and stop the slew if the load begins to swing. Reduce speed before changing direction, and never rely on the rated capacity limiter as an operating tool - it is a back-up.