A bulldozer or dozer (also called a crawler) is a large, motorized machine that travels on tracks and is equipped with a metal blade for pushing material, i.e. mud, sand, ice, etc. during construction or conversion work.

In a bulldozer, the cutting blade is mounted at the direction perpendicular to the direction of travel; when the cutting blade is set at the angle with the direction of travel, it is called angle dozer.

These angle dozers are used inside hill works where the material is to be pushed down the slope; bulldozer pushes earth forward while angle dozer pushes it forward and to one side.

When V-shaped blade is attached in front side to cut the trees and to drive out roots, it is called tree dozer.

If the blade is tilted to rise from one end by 20 to 25 cm, it is called a tilt dozer, the size of the bulldozer is indicated by the length and height of the blade, its size, shape, and capacity.

The size of its blade may vary from 1700 mm x 700 mm to 3380 mm x 1140 mm, and its capacity is 0.7 m3 to 3.7 m3.

Types of Bulldozer:

There are many different types of bulldozer as follows-

Classification based on bulldozer wheels:

1.Crawler Bulldozer:

The crawler is a tracked bulldozer that appears much like a tractor.

This heavyweight machine is used to hold materials from one place to another.

It is ideal for dense and irregular areas as the tracks give it excellent grip, crawlers have wrappers that assistance in compact ground crushing and clearing.

2.Wheel bulldozer:

This machine is a tire bulldozer usually extra critical than a crawler.

A wheel dozer is extra controllable than a crawler; later its tires provide better general handling.

It also has fully hydraulic steering and runs on a short axle.

This machine is right for the soft or delicate floor as a result of the tires are minor compared to the tracks.

3.Mini Bulldozer:

This is a small bulldozer often known as a compact bulldozer used for tasks that require extra mobility and flexibility than additional massive equipment.

Its small dimension can perform excellently in all kinds of tasks that require tasks corresponding to grading and clearing lots.

Classification based on Bulldozer blade:

These types of dozer might be classified based on the blades used.

Different blades serve entirely different functions and it can deal with various kinds of materials and multiple loads.

4.Straight Blade (S-Blade):

An S-blade is the smallest blade dozer and does not have surface wings, this blade assigns to the lower rear corners of the module.

It is best for fine-grained and medium-to-hard-density materials and its straight-shaped limits of lifting and carrying capabilities of the dozer.

Some capabilities of the S-blade include stumping, backfilling, grading clay.

5.Universal Blade (U-Blade):

A U-blade has long edges and a curved shape that makes it ideal for transferring material to more extended parts.

When spreading the wings, the material remains like the S-Blade, additionally they connect to the decrease rear corners of the blade.

It is the most excellent for soft to medium density soils.

The best capabilities for U-Blade include trenching, ruling, pushing, and crowning.

6.S-U (Semi-U) Blade:

This blade combines the S-blade & U-blade, it provides sufficient penetration and high overall versatility.

It is less slim, much less curved, and has shorter edges than regular U-blades, this design makes it ideal for transferring soil over lengthy distances.

This blade connects the bottom of the module using angled stabilizing struts and either one or two hydraulic tilt cylinders.

It pushes the medium-density soil; it’s most excellent capabilities for the S-U blade include crowning, shaking, stumping, and trenching heavy materials.

7.Angle blade:

This type of blade bulldozer assigns at the center of the bulldozer’s panel.

Its location is favorable for separating the particles because it results in an angle of 30 degrees left or right.

Angle blades are considered to be two-way modules, selected for works ranging from low to medium-hard density soil, snow, and gravel.

The most outstanding capabilities include stumping, shaping, stripping, and ditching.

8.Power-angle-tilt (pat) blade:

The pat blade is one of the most versatile blades.

The driver controls the blades from the cabin & it can tilt at any angle in almost all directions.

Similar to the angle blades, these blades are mounted in the center of the panel.

Best practices include scraping, land clearing, leveling, backfilling, and grading.

Also read: Excavator & Backhoe

parts of bulldozer:


A ripper is a prolonged attachment located behind the bulldozer that resembles a claw.

It is used to interrupt the land to allow for growing agriculture crops or to break the rock.

Final drive:

The bulldozer’s final drive might necessarily be the most used and modified part of the bulldozer.

Modern final drive distributes the load to the gear teeth and drives the motor away from the suspension.

The cab:

Bulldozer cab is an essential part of this machine where the operator controls this machine.

There are different options for some cabs that enhance both its stage of consolation and security.


The tracks help navigate steep, uneven terrain, while the tires are more suited to the ground.


Bulldozer are generally need high-powered engines to transfer heavy material from one place to another at the workplace, different varieties of engines meet entirely different necessities.

For instance, some new engines generate fewer emissions than older drivers to adjust to particular EPA necessities.

Push Frame:

A push frame is required when the fabric for varied tasks; this part is responsible for moving the blade.

Bulldozer blade:

The blade is a substantial steel plate situated in front of the bulldozer used to push and excavate the material.

Also read: Power Shovel & Sheepsfoot Rollers


A bulldozer is a tractor equipped with an adequate metal plate that is used to push large amounts of soil, sand, debris, or other material during construction or conversion work.

Hello, I'm Rahul Patil founder of Constructionor.com, I had studied B.E. Civil. This blog provides authentic information regarding civil structures, equipment, materials, tests & much more.

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