MASS Load Charts and Capacity 3

Question 1

When calculating load radius, the measurement is taken from the center of rotation to:

Accepted Answer

The center of the suspended load

Answer

Load radius is the horizontal distance from the center of rotation to the vertical centerline of the load.

Question 2

Boom deflection under load tends to do what to the actual operating radius?

Accepted Answer

Increase it beyond the no-load radius

Answer

As the boom bends under load it moves the tip outward, increasing the real radius and lowering capacity.

Question 3

If a load chart lists capacities for 'fully extended outriggers,' using mid-extended outriggers means you must:

Accepted Answer

Use the lower mid-extended capacity column instead

Answer

Reduced outrigger spread narrows the stability base, so a separate, lower capacity column applies.

Question 4

A 360-degree (over-the-side) rating compared to an over-the-rear rating on a rough-terrain crane is usually:

Accepted Answer

Lower, because over-the-side is the least stable orientation

Answer

Over-the-side lifts are governed by the narrowest stability and therefore carry lower ratings.

Question 5

What information does the 'range diagram' portion of crane documentation provide?

Accepted Answer

The relationship between boom length, boom angle, radius, and lift height

Answer

The range diagram shows how boom length and angle translate into radius and available lifting height.

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