What should be the main focus when operating an excavator on sloped terrain?

When operating an excavator on sloped terrain, the primary focus should be on adhering to design limits for safety. This is crucial because excavators have specific stability limits based on their design, which includes factors such as center of gravity and the overall weight distribution. Operating an excavator outside of these design limits can lead to tipping or loss of control, especially on slopes where gravitational forces act differently than on flat ground.

Maintaining the machine's stability ensures that the operator can work efficiently and safely, preventing accidents that could result in injury or damage to the equipment. Factors like the slope's grade, the type of soil, and the equipment's load should all be considered to stay within those design limits.

The other options do not prioritize the safety and operational integrity of the excavator. For instance, maximizing speed can compromise control, while using larger attachments may affect the machine's balance. Reducing maintenance checks could lead to mechanical failures, further compromising safety on uneven terrain. Therefore, the emphasis on adhering to design limits is essential for safe and effective excavator operation on slopes.