Which method involves placing a level at two points on the slew gear perpendicular to each other to verify level?

• A. Place a level at two points on the slew gear perpendicular to each other
• B. Raise the boom to a high angle and watch the load line
• C. Raise the boom and observe LMI values
• D. Use a plumb bob

Answer: (A)

Verifying level in two horizontal directions is the idea here. Placing a level at two points on the slew gear, with the levels arranged perpendicular to each other, gives you a direct check of level in both fore‑aft and side‑to‑side directions. If both levels show the bubble centered, the base is truly level in two axes, which is essential for safe operation and correct crane geometry.

The other methods don’t test the base’s level in two directions. Raising the boom and watching the load line tells you about the line’s path under lift, not how level the slewing base is. Observing LMI values relates to load moment and hoisting forces, not the crane’s level. Using a plumb bob checks vertical alignment, but it doesn’t verify the two‑axis level condition of the slew gear in the plane of the crane.