In a lifting scenario with outriggers on rubber, what is the minimum stability?

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Multiple Choice

In a lifting scenario with outriggers on rubber, what is the minimum stability?

Explanation:
When outriggers rest on rubber, the ground is less able to resist tipping as the crane lifts, so a larger safety margin is required. That means you must keep the lift within a stability level that is not lower than 75% for that configuration. In practice, this translates to planning the lift so the load moment stays at or below about three-quarters of what the crane could safely handle with solid support. For example, if the chart shows a 10-ton capacity at a given reach on solid ground, you’d limit the lift to around 7.5 tons when the outriggers are on rubber. Higher margins (like 85% or 95%) would be overly cautious for this setup, while a much lower margin (like 65%) would not provide enough safety against ground shift and tipping.

When outriggers rest on rubber, the ground is less able to resist tipping as the crane lifts, so a larger safety margin is required. That means you must keep the lift within a stability level that is not lower than 75% for that configuration. In practice, this translates to planning the lift so the load moment stays at or below about three-quarters of what the crane could safely handle with solid support. For example, if the chart shows a 10-ton capacity at a given reach on solid ground, you’d limit the lift to around 7.5 tons when the outriggers are on rubber. Higher margins (like 85% or 95%) would be overly cautious for this setup, while a much lower margin (like 65%) would not provide enough safety against ground shift and tipping.

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