Dozers, also known as bulldozers, tracked tractors, or tracked loaders, are found on almost every mining and construction site around the world. Our goal is to discuss answers to frequently asked questions about our beloved bulldozers, including their origins, how they are used, and how they work.

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Where/Who/Why the Bulldozer was Invented?

It's an interesting fact: the first design that led to the bulldozer was powered not by a horse, but by a goat! Designed by the Frenchman M. D'Hermand in , it was basically a tracked trailer pulled by a goat. However, like many other tracked tread designs of the s and s, this design never made it past the prototype stage.

In Alvin Lombard designed a steam-powered log hauler with tracked treads to improve snow traction. Another interesting twist is that although the original design was steam driven, they were driven by horses. This feature existed until the steering wheel and sled system were added to the machine.

The bulldozer really became a reality through the work of Benjamin Holt and his tracked tractor. The purpose of using tracks was to prevent the tractor from sinking into the soft soil. At the same time, David Roberts of R. Hornsby & Sons was working on a similar design to deal with a similar problem. Since then, many other companies have started to use tracked tracks in their tractor designs, giving rise to the modern bulldozer.

What is a bulldozer?

Bulldozers have a variety of applications. Most bulldozers have a shovel blade at the front and a cracker at the rear. The blade moves the material from one place to another. The ripper does exactly what it sounds like: rips up the ground to make it easier to handle or transport. This combination can be used for grading or preparing hard ground for planting. Multiple attachments can be added to use the dozer for many other types of work.

What is a bulldozer used for?

There are many different uses for bulldozers. Most bulldozers have a blade at the front of the machine and a ripper at the rear. The blade moves the material from one place to another. A ripper does exactly what its name implies: it tears the ground apart, making it easier to use or transport. This combination can be used to promote levelling, prepare hard ground for planting, etc. Many attachments can be added to extend the type of work the dozer can be used for.

How does a dozer work?

The key to what makes most dozers different is their continuous tracks. The track design of a dozer allows it to float on soft ground by distributing the weight of the machine over the tracks. It can operate successfully in areas where wheeled machines are difficult to maneuver or get stuck. These tracks also provide the tremendous traction needed to push material with a bulldozer shovel or tear up hard surfaces with a soil cracker.

Can you remove tree stumps with a bulldozer?

Yes, you can, depending on a number of variables. Stumps weighing hundreds of pounds require a powerful bulldozer. Backhoes are considered a better solution for stump removal and they can loosen the soil around the stump to simplify the removal process. Backhoes are also recommended as they can be drilled under the stump to gain leverage.

The Dozer: Everything You Need To Know

Updated December 26th,

What is a Bulldozer?

Also called a crawler or a bulldozer, dozers are heavy equipment often used for large-scale construction and mining projects. Fitted with a blade on the front and a ripper on the back, dozers are powerful demolition and pushing machines.

They are used mainly for excavation, digging, leveling, and earthmoving projects including pushing large amounts of heavy materials like snow, rock, sand, dirt, and more. As the front of a bulldozer has a blade rather than a bucket, they're not as great at material handling as other equipment like skid steers, backhoes, wheel loaders, or even excavators.

Bulldozers move on heavy metal tracks which makes them ideal for rough terrain. Because of these tracks, crawlers should not be used on finished concrete or asphalt.

Popular construction sites that dozers are used for include the early stages of road building, land clearing like removing rubble, rocks, or debris, fine grading, or ground leveling. These crawlers are also great for other forms of heavy-duty maintenance like snow plowing and tearing up asphalt.

Dozers for Different Jobs

There are different kinds of dozers that will impact the choice you make: there are standard track-width dozers as well as low-ground pressure dozers, also known as wide-track dozers. When working in soft-ground environments, you'll want an LGP dozer to prevent any sinking or chance of getting stuck.

Bulldozers can be used for a variety of different construction projects. Since their large flat blades can be used to push and move large amounts of dirt or rock, dozers are often seen in a variety of commercial and large-scale industries such as construction, mining, and farming. The heaviness of what the machine can push will change based on the dozer's specs.

A bulldozer can also be used with other pieces of heavy equipment to effectively and efficiently complete a project. The bulldozer is a great addition to any excavation project and is often used alongside backhoes or excavators to move the excavated materials around. 

Aside from pushing around dirt and soil, bulldozers can be used to clear brush and waste using the ripper on the back. They are also used often on landfill projects due to their ability to push around heavy loads. Lastly, bulldozers can also be used to grade surfaces, rip out trees, and grind down rocks.

The ability to change the blade type adds versatility and multifunctionality to the bulldozer.

The Different Dozer Blades and Attachments

While not the best machine for lifting and material handling, fitting the dozer with the right blade can help the machine become more efficient. There are several blade types including straight blades (S-blades), universal blades (U-blades), Semi-U (S-U-blades), and Angle Blades.

S-blades are wingless blades used for high-density materials like mud, stumping, or grading. U-blades are more curved and have wings making them better options for jobs like ditching, hauling, or pushing where more loose materials like dirt or sand will be found.

S-U-blades are less curved than U-blades and have smaller wings but are great for heavier materials. Angle blades allow for the blade to push materials to angles up to 30 degrees and are best for granular materials like snow or gravel. The S-U-blade is the most commonly used one.

Lastly, there are Power-Angle-Tilt blades or PAT blades. These blades provide the most versatility because they can tilt, angle, and lift in every direction. PAT blades are used for backfilling, leveling, land clearing, spreading, scraping, and grading projects.

Beyond blades, dozers can also be fitted with rakes. For example, root rakes are a great attachment when doing large-scale land clearing that can take out bushes and roots while leaving any of the soil behind.

The rippers on the back of a bulldozer are used to break down rock or hard surfaces and make them easier to move.

Important Dozer Specs

The most common way to refer to bulldozers is through their specs including model number, operating weight, and horsepower. There are also typically three sizes of dozers: small, medium, and large.

Small bulldozers are machines between 15,000 lbs and 25,000 lbs, medium dozers are between 25,000 lbs and 100,000 lbs, and large dozers are any machine above 100,000 lbs. The horsepower range of these machines is typically less than 100 hp for small, between 100 and 400 hp for medium, and above 400 hp for large.

Manufacturers of Bulldozers

There are only a few manufacturers to consider when looking to buy or rent a dozer. Many modern bulldozers have state-of-the-art technology built into them like grade technology or increased load-carrying performance. However, the strength of the machine will depend on different dozer specs, sizes, and models.

Are you interested in learning more about Bulldozer Manufacturer? Contact us today to secure an expert consultation!

A variety of bulldozer rentals are available on DOZR including machines ranging from 15,000 lbs up to 200,000 lbs. The following is a look at some more popular brands of bulldozer suppliers.

Caterpillar

Caterpillar is one of the most recognized brands of heavy equipment and machinery. Within their bulldozer portfolio, they make 18 models including the small D1, D2, and D3 dozers, their medium Cat bulldozers, the D4, D5, D6, D6XE, D7, and D8 dozers, and their large crawlers including the D9, D10T2 (Tier 4 Final), and D11 dozer, which is the biggest Cat dozer at 229,800 lbs. There is no D12 dozer currently.

For their specs, Caterpillar dozers range between 80 to 105 hp and 15,000 lbs to 20,000 lbs for the small dozers, 130 to 350 hp and 29,000 to 88,000 lbs for the medium dozers, and 450 to 800 hp and 100,000 lbs to 250,000 lbs for the large crawlers.

Previously, Caterpillar models were titled the D3K, D4K, D5K, D6K, D6N, and D7E. This range has become what is now known as the D1 to D6.

Caterpillar does also have some wheeled dozers including the 814, 824K, 834K, 844K, and 854K models.

Liebherr Group

Designed with performance, efficiency, comfort, and reliability in mind, Liebherr bulldozers offer a variety of different options. Liebherr doesn't produce any standard small crawler tractors as the Liebherr 716 and 726 dozers, their two smallest models, have operating weights between 29,000 lbs to 46,000 lbs.

The Liebherr 776 dozer is their largest dozer with an operating weight of 161,354 lbs and 757 horsepower.

Komatsu

One of the world’s leading suppliers and manufacturers of heavy equipment, Komatsu dozers are anything but little. Manufacturing equipment for several different industries, Komatsu bulldozers are made for industries like construction, mining, quarrying, forestry, and compact construction. Komatsu dozer sizes are also filtered by small, medium, and large.

For their small crawlers, they make 10 models ranging from 19,842 lbs to 31,438 lbs. They also have 16 medium bulldozers ranging from 41,094 lbs to 53,000 lbs and 11 large bulldozers ranging from 68,530 lbs to 120,970 lbs. Lastly, they have industry-specific machines including their surface mining dozers, the D375 and D475, which are 163,340 lbs and 254,195 lbs respectively.

The D475 is Komatsu's largest dozer.

John Deere

Growing from what was originally just a plow, John Deere dozers offer a large variety of heavy equipment. The smallest John Deere bulldozer is the 450 dozer coming in at 18,752 lbs and 80 horsepower. Their largest crawler dozer is the John Deere with a weight of 96,000 lbs and 350 hp, making it quite a bit smaller than other manufacturers on this list.

In between the John Deere 450 dozer and , they also have the 550, 650, 700, 750, 850, and 950 dozers. There also used to be the John Deere 350 dozer but that has been discontinued and bought used.

Case

The last supplier we're going to cover in this blog is Case. Case dozers include 6 models: the 650M, 750M, 850M, M, M, and M. They also previously had the Case 450 dozer, but this was discontinued.

The smallest Case bulldozer, the 650M, has an operating weight of around 16,000 lbs and 68 horsepower. The largest Case dozer, the M, has an operating weight of 49,000 lbs and 218 horsepower, making their models only in the small and medium ranges.

Looking for a dozer rental? You can rent a bulldozer from DOZR Marketplace. Models and availability may vary depending on location.

Safety Protocols for Operating a Dozer

Operating any kind of heavy equipment could pose a safety hazard and dozers are no exception. It is important to always be careful and to only operate a piece of heavy equipment after receiving proper training. Bulldozers are incredibly powerful machines and incorrect usage can create a dangerous situation.

We have a full guide to safety tips for dozer operators, but here's a short list as well:

• Use the handrails and steps to get into the bulldozer and maintain three points of contact. Never take another route to the cab.

• Latch down any external areas like the ripper or climbing ladder.

• Travel at slow speeds, especially in heavy traffic areas or in rough terrains where it's harder to control the machine

• Make sure to start from the bottom when working on a hill and use the machine on a diagonal

• Take the time to fully turn off the equipment when leaving the cab of a dozer. This can ensure that the machine is stable and won’t move.

• Always check the blind spots and use a spotter if needed

• Provide any upkeep needed - tracks that are too tight can lead to unnecessary repairs and maintenance

Do You Need Training To Operate a Dozer?

In the United States, OSHA – Occupational Safety and Health Administration – does not provide certifications for heavy equipment operation but does require an employer to provide training and instruction. Any employee tasked with the operation of heavy equipment must receive training in:

• Safe operation of the equipment
• Recognition of unsafe conditions
• Avoidance of unsafe conditions

OSHA mandates that only employees with proper training from their company may operate the equipment.  

The most important point to remember for any operation of heavy equipment is to only do so if this training has been provided and it is safe to do so. Always request training before agreeing to operate a piece of new machinery. Put safety first and take training protocols seriously.

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