The Plant Mechanic is often an outsourced role, but some civil construction companies employ an internal resource to do their mechanical work. This role ensures that plant and equipment is regularly serviced and kept working. Plant that has defects or is unable to be used costs businesses money, so it is imperative that plant is kept in use or service. Plant mechanics would also do regular servicing of vehicles, plant and equipment to ensure warranties are maintained and the plant works to its full potential.

They are often also Diesel Fitters and they contribute to projects being delivered on time, safely and efficiently.