Loader, also know as bucket loader, wheel loader, is a main kind of earth working construction machinery  in the project.Its main component parts includes engine, torque converter, transmission, front and rear driving axles, referred to the four big parts.
1. engine
2. on the torque converter has three pumps, pump (supply lift and dump oil pressure) steering pump (supply steering oil pressure) variable speed pump walk, also known as pumps (supplies torque converters, transmission oil pressure), and some models on the power steering pump is also equipped with a pilot pump (supply control valve pilot operated pressure oil)
3. hydraulic oil, hydraulic oil tank, pump, valves, lifting cylinders and tipping cylinder
4. walking circuit: gearbox oil pan oil pump walking all the way into the torque converter stall valve all the way, the gearbox clutch
5. drive: drive shaft, differential, wheel-side reducer
6. turn circuit: fuel tank, steering pumps, steady-flow valve (valve or priority) the steering gear, steering cylinder
7. the gearbox : two kinds, (planet) and split (coaxial)