How a Hydraulic Excavator Works: Fuel to Force (46)

An excavator arm has no gears, no chains, and no cables. So how does fuel in a tank become force at the bucket tip? This video follows the whole journey in order: diesel engine, hydraulic pump, pressure, control valve, cylinder, motors, and cooling. You'll learn how a hydraulic excavator works, how an axial piston pump makes flow, why pressure only appears when oil meets resistance, how a joystick steers a spool valve through a pilot circuit, why the arm holds still when you let go, how the cab spins without twisting its hoses, and why hydraulic oil runs hot. Note: Numbers such as horsepower, flow rate, pressure and temperature vary by machine and design. Figures in this video are typical or illustrative, and animations are simplified teaching models, not exact depictions of any one manufacturer's design. CHAPTERS 0:00 The arm with no gears 0:16 The one question 0:36 The diesel engine 2:07 The hydraulic pump 3:38 Why pressure appears 5:12 The relief valve twist 5:44 Control valve and joystick 7:19 The hydraulic cylinder 8:50 Motors, swivel joint and cooling 10:27 A common misconception 11:22 The full journey Next on Forged Facts: how a hydraulic press forges red-hot steel into shape. #HydraulicExcavator #Engineering #HowItWorks