An excavator operator is digging a deep trench on a moderate slope. The excavator is positioned with its tracks parallel to the slope, facing downhill. To maximize stability during the digging operation, what should the operator ensure regarding the swing radius?

Question: An excavator operator is digging a deep trench on a moderate slope. The excavator is positioned with its tracks parallel to the slope, facing downhill. To maximize stability during the digging operation, what should the operator ensure regarding the swing radius?

Answer options:

• Keep the swing radius as wide as possible to distribute the weight ✅ Minimize the swing radius and keep the boom over the downhill track side
• Keep the boom and arm as high as possible throughout the dig
• Swing the boom over the uphill track side to counteract gravity

Correct answer: Minimize the swing radius and keep the boom over the downhill track side

Explanation: When digging downhill on a slope, minimizing the swing radius and keeping the boom over the downhill track side helps to maintain stability by keeping the centre of gravity within the machine's stable base. Swinging over the uphill side or keeping the boom high would increase the overturning moment and reduce stability. A wide swing radius is generally detrimental to stability during a heavy operation on a slope.