Crane Components, Configurations & Terminology Flashcards

On a lattice boom section, the main longitudinal members that run the full length of the section are called:

Answer: Chords

Chords are the primary load-carrying members, while lacings are the diagonal braces connecting them.

What is the primary purpose of a jib attached to the boom tip?

Answer: To extend the crane's reach and lifting height

A jib adds length beyond the boom tip for more reach, usually at a reduced capacity.

On a lattice boom crawler crane, the gantry (A-frame) mainly serves to:

Answer: Raise the boom hoist reeving point to improve leverage for raising the boom

The gantry raises the boom hoist bridle anchor point, giving better mechanical advantage for luffing the boom.

Fixed-length wire ropes or bars that connect the boom tip to the bridle and hold up the boom are called:

Answer: Pendants

Pendants are fixed-length supports between the boom point and the bridle or gantry.

When outriggers are set correctly on a mobile crane, what should happen?

Answer: All tires come off the ground and the crane is level

Fully extended, level outriggers with tires clear of the ground give the rated on-outrigger capacity.

What is the main function of a crane's counterweight?

Answer: To offset the load moment and resist tipping

Counterweight balances the overturning moment created by the boom and load.

A heavy weighted ball attached above the hook on a single-part line is called a(n):

Answer: Overhaul ball (headache ball)

The overhaul ball provides weight so the single-part line pays out and lowers when unloaded.