Most construction machinery is powered by diesel engines. However, some smaller or electrically - driven models may use electric motors powered by batteries or an external power supply. For example, small indoor construction equipment or those working in areas with strict emissions regulations might be electrically powered.

By function, like earth - moving, lifting, compaction, and concrete - handling machinery. Or by size, such as small - scale, medium - scale, and large - scale ones.

Clean regularly, lubricate moving parts, check blades, and inspect electrical components.

Regular maintenance is crucial because it ensures the machinery's reliability, safety, and longevity. It helps to prevent breakdowns during operation, which can cause delays in construction projects. Maintenance includes checking and replacing worn - out parts, lubricating moving components, and cleaning to remove dirt and debris that can affect performance.

Drum - type (drum rotates with blades mixing) and pan - type (blades rotate in a pan).

Tower crane has a vertical tower, a rotating jib. Hoist lifts loads, and the trolley positions them. It climbs as the building rises.