Saturday, November 5, 2011



bulldozer is a crawler equipped with a substantial metal plate (known as a blade) used to push large quantities of soil, sand, rubble, etc., during construction work and typically equipped at the rear with a claw-like device (known as a ripper) to loosen densely-compacted materials.

Bulldozers are classified according to the type of mounting.

1. Crawler Mounted Bulldozer

2. Wheel Mounted Bulldozer

Bulldozers are classified according to the method of raising and lowering the blade.

1. Cable-controlled Bulldozer
2. Hydraulically-controlled Bulldozer

Uses of Bulldozer

1. Clearing land of timber and stumps.
2. Opening up pilots roads through mountains and rocky terrain.
3. Moving earth from haul distances up to approximately 100 meters.
4. Helping load tractor-pulled scrapers.
5. Spreading earth fill.
6. Backfilling trenches.
7. Clearing construction sites of debris.
8. Maintaining haul roads.
9. Clearing the floors of borrow and quarry pits.

Advantages claimed for the Crawler-Mounted Bulldozer

1. Ability to deliver greater tractive effort, especially in operating on soft footing, such as loose or muddy soil.
2. Ability to travel over muddy surfaces.
3. Ability to operate over rocky formations, where rubber ties might be seriously damaged.
4. Ability to travel over rough surfaces, which may reduce the cost of maintaining haul roads.
5. Greater flotation because of the lower pressures under the tracks.
6. Greater use versatility on  jobs.

Advantages claimed for Wheel-Mounted Bulldozers

1. Higher travel speeds on the job or from one job to another.
2. Elimination of hauling equipment to transport the bulldozer to a job.
3. Greater output, especially when considerable travelling is necessary.
4. Less operator fatigue.
5. Ability to travel on paved highways without damaging the surface.


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