National Commission for the Certification of Crane Operators (NCCCO) Mobile Crane Practice Exam

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How should a crane’s wheels be positioned when set up for working on outriggers?

  1. Just touching the ground

  2. As high as possible off the ground

  3. Just high enough off the ground to relieve the tires of crane weight

  4. Firmly on the ground to support the crane

The correct answer is: Just high enough off the ground to relieve the tires of crane weight

When a crane is set up for operation on outriggers, the correct approach is to position the wheels just high enough off the ground to relieve the tires of the crane's weight. This ensures that the outrigger system is effectively doing its job, providing stability and support to the crane while it's in operation. Raising the tires slightly off the ground indicates that the majority of the weight is distributed through the outriggers, which helps minimize the risk of tipping and improves the overall safety of the lift. If the tires were just touching the ground, they could still absorb some weight, potentially compromising the stability provided by the outriggers. Conversely, lifting the tires significantly high could result in an unstable setup and could lead to accidents during operation. Ensuring that the wheels are just high enough to avoid bearing weight while using the outriggers strikes a balance that promotes stability and safety.

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