Use the load line to determine the levelness of the crane. It should always lie
in the center of the boom.
Be sure the hoist line is vertical before starting the lift. Don't subject the
crane to side loadings.
Measure the load radius before making lifts and stay within approved lifting
areas. Check your load chart!
The importance of properly leveling a crane cannot be overstressed. A crane
only slightly out-of-level can quickly encounter a tipping condition.
Barricade the area around which the crane is working.
Don't interfere with the proper functioning of operational aids or warning
devices. Monitor them regularly and see they get the proper care.