(ON SLIDE #28-35) SCRAPERS 5. INTRODUCTION TO SCRAPERS. (30 mins) Scrapers are designed for loading, hauling, and dumping on long-haul earth moving operations. The scraper has three basic operational parts; the bowl, the apron, and the ejector. The bowl, which is equipped with a cutting edge on the front bottom, is the loading and carrying component. The apron is the front wall of the bowl, and can be raised and lowered independently of the bowl. The ejector is the rear wall of the bowl. It is moved back to load, and forward to discharge materials. a. USE. In the field of heavy construction, tractor-scrapers serve the primary purpose of loading, and hauling material. The distinct advantage of the tractor-scraper, in earth moving, is the ability to load, haul, and spread in one continuous cycle. The tractor-scraper is capable of working alone for leveling but is supplemented with push-tractors for cut and fill operations. b. CLASSIFICATION: Tractor-scrapers are classified according to load capacity, and rated load. Capacity is measured in heaped and struck capacity. A heap load is the maximum load of the machine, and a struck load is the minimum effective load. c. CHARACTERISTICS: Tractor-scrapers are wheeled vehicles characterized by a tractor and scraper. They serve as prime
(ON SLIDE #28-35) SCRAPERS 5. INTRODUCTION TO SCRAPERS. (30 mins) Scrapers are designed for loading, hauling, and dumping on long-haul earth moving operations. The scraper has three basic operational parts; the bowl, the apron, and the ejector. The bowl, which is equipped with a cutting edge on the front bottom, is the loading and carrying component. The apron is the front wall of the bowl, and can be raised and lowered independently of the bowl. The ejector is the rear wall of the bowl. It is moved back to load, and forward to discharge materials. a. USE. In the field of heavy construction, tractor-scrapers serve the primary purpose of loading, and hauling material. The distinct advantage of the tractor-scraper, in earth moving, is the ability to load, haul, and spread in one continuous cycle. The tractor-scraper is capable of working alone for leveling but is supplemented with push-tractors for cut and fill operations. b. CLASSIFICATION: Tractor-scrapers are classified according to load capacity, and rated load. Capacity is measured in heaped and struck capacity. A heap load is the maximum load of the machine, and a struck load is the minimum effective load. c. CHARACTERISTICS: Tractor-scrapers are wheeled vehicles characterized by a tractor and scraper. They serve as prime
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