{ "item_title" : "How Does an Excavator Work?", "item_author" : [" Andrew Crotts "], "item_description" : "Have you ever watched an excavator scoop up a giant pile of dirt and wondered how such a huge machine can move so precisely?An excavator is much more than a big bucket and tracks. Hidden inside is a powerful system of engines, pumps, hydraulic oil, hoses, cylinders, and controls that work together to dig and move earth.How Does an Excavator Work? takes curious young readers inside one of the most fascinating machines on a construction site.Kids will discover how a diesel engine powers hydraulic pumps, how pressurized oil moves through strong hoses, and how that pressure pushes pistons inside hydraulic cylinders to create powerful movement.They'll learn how the boom raises and lowers, the stick reaches in and out, and the bucket curls to scoop, all while an operator controls each movement using joysticks.Young readers will also discover how hydraulic motors move the tracks, why wide tracks help support the machine, and how the entire upper body can turn while the tracks stay still.Then they'll follow an excavator through a real digging cycle as it lowers the bucket, breaks into the soil, scoops, lifts, turns, and empties the dirt into a waiting dump truck.They'll even discover how different attachments can transform an excavator for different jobs Packed with colorful illustrations and easy-to-understand explanations, How Does an Excavator Work? is perfect for curious kids who love excavators, construction equipment, big machines, engineering, and discovering how things work Part of the How the World Works series-educational books that reveal the amazing people, machines, and systems behind the world we see every day.", "item_img_path" : "https://covers1.booksamillion.com/covers/bam/9/79/816/209/9798162094340_b.jpg", "price_data" : { "retail_price" : "12.99", "online_price" : "12.99", "our_price" : "12.99", "club_price" : "12.99", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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