On a crawler-mounted crane, the load chart shows capacities based on the crawlers being in which configuration?

• A. Extended crawlers
• B. Retracted or extended crawlers
• C. Single crawler
• D. Double crawler

Answer: (B)

The lift capacity of a crawler-mounted crane depends on how wide and stable its base is. The undercarriage can be set with the crawlers in a retracted, narrower position or in an extended, wider position. This base configuration changes the crane’s resistance to tipping and the distribution of ground bearing, so the load chart is built to show capacities for both states. In practice, you’ll read the chart for the crawler configuration you’re using (retracted or extended) because the same lift can have different safe limits depending on that stance. The widening of the base generally allows higher capacities, while the narrower base reduces capacity. Other options don’t reflect this adjustable base effect, which is why the correct understanding is that capacities are shown for retracted or extended crawlers.