The main components include the engine, torque converter, transmission, and front and rear drive axles, collectively known as the four major parts.
1. Engine
2. The torque converter has three pumps: a working pump (supplying lifting and tipping hydraulic pressure), a steering pump (supplying steering hydraulic pressure), and a transmission pump (also called a travel pump) (supplying torque converter and transmission hydraulic pressure). Some models also have a pilot pump on the steering pump (supplying pilot hydraulic pressure to the control valve).
3. Working hydraulic circuit: hydraulic oil tank, working pump, multi-way valve, lifting cylinder, and tipping cylinder.
4. Travel hydraulic circuit: transmission oil sump, travel pump, one line to the torque converter, one line to the gear position valve, and transmission clutch.
5. Drive: driveshaft, main differential, wheel-side reducer.
6. Steering hydraulic circuit: oil tank, steering pump, flow control valve (or priority valve), steering gear, and steering cylinder.
7. Transmissions are available in two types: integrated (planetary) and separate (fixed-shaft).
