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California Structural Steel Contractor (C-51 License) Practice Exam

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On crawler-cranes and truck-cranes, the boom is mounted on the front end of the crane body by means of:
Correct Answer:
Boom heel pins
Explanation:
The main idea is the way the boom is attached at its base to the crane body. On crawler-cranes and truck-cranes, the boom heel is mounted to the front end of the crane body with boom heel pins. These pins form a pivotal connection that lets the boom tilt up and down while safely transferring the loads from the boom into the crane structure. They’re typically sized as a strong, removable pin arrangement, often in pairs, to provide a robust yet serviceable mounting. Other terms like base plates simply distribute loads at the joint, and generic hinge or bolt concepts don’t describe the specific, purpose-built connection used at the boom’s base.

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