Construction machines is a general term for a number of very different commercial vehicles used in construction, excavation or mining, such as: Wheel loader, Excavator - Backhoe loader, Roller, Concrete pump, Track-Type Tractors, Grader, etc. Many of these have further subgroups of vehicles configured for special applications. Therefore it is difficult to derive common buying recommendations. In general it can be said that construction machines are subject to excessive wear and tear, so that particular attention should be paid to: joints, axles, hydraulics, tyres, motor and transmission. The supply of spare parts is likewise an important buying criterion. Each buyer is recommended to pay particular attention to how many operating hours a machine has logged.