Chain LoadingChain loadingFigure 10-46.-Shuttle loading.is used where the cut is fairly long,making it possible for the push cat to pickup two or morescraper loads without back tracking, as shown in figure10-47. The push cat push loads one scraper, then movesin behind another scraper, moving parallel to the first inan adjacent lane.Optimum LoadingOptimum loading is an operation when loading timeand maximum output are critical. Push-loaded scrapersshould be loaded within 1 minute and within a distanceof 100 feet. More time and distance may be used toobtain more material when the haul is long enough, andthe added material is great enough to offset haulingfewer loads because of longer loading time.When scrapers are backed up at the cut waiting forpush cat assistance, let the scrapers cut without attaininga heaped load. When push cats are waiting for scrapers,increase loading time to achieve maximum loading.Make sure push cats use wait time to dress the cut. Insome cases, it will increase production to use a dozerfull time to dress the cut. At the end of a workday, takethe time to shape the cut for good drainage.NOTE: Maintaining adequate drainage throughouta cut and fill operation reduces compulsory downtimecaused by bad weather.The rule of thumb used for computing the numberof push cats required for a scraper operation is to dividethe scraper cycle time by the push cat cycle time. Whencomputing cycle time for a scraper, take the total timeof loading, hauling, unloading, and return; for instance,Figure 10-47.-Chain loading.10-25
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