Dozers can be classified as –
1. Crawler type
2. Wheel type

Dozers are generally used for haulage distances less than 50m .

2. Power shovels - Shovels also called power shovels are the hydraulic excavator . In the shovel , a excavation bucket is attached to the hydraulically controlled boom & stick . The bucket moves in a forward and upward direction . The bucket can be swung around depending upon the type of the shovel and load the soil in the truck. The shovels may be either crawler or rubber tire carrier mounted . They are many variations , depending upon the manufacturers. Its capacity is dependent upon the manufacturer specifications . A construction engineer needs to enquire about the bucket capacity , cutting height , output , etc to plan the construction work .


3. Scrapers – Scrapers is a large steel bowel attached with the cutter at the bottom , which is molded on the wheel. It is a multipurpose equipment which is used for excavation the soil , transporting it and spreading it at the other place . The basic operating parts of the scrapers are bowl , apron, ejector . During excavation , the cutting edge is lowered to scrape the soil . the cutting edge is raised when the bowl is filled . The material is spread after transporting a short distance . There are various types of scrapers , such as pusher loaded , self loading , etc . Scrapers can be used for a haulage distance of 100m to 1500m . Scrapers are not suited for hard rock , muddy soil and certain types of sands which does not pile up in the scrapers .