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First of all, let's answer this question: What is a bulldozer? Despite the general public's perception, dozers are not the machines you see with buckets mounted on sticks digging dirt (they're called excavators) or rigs equipped with a front end loader (those are called wheel loaders).
Bulldozers are, specifically, tractors equipped with a heavy, front-mounted blade on tracks or wheels.
Despite their relatively simple design, bulldozers ' more commonly known simply as 'dozers' in Australia ' can be put to a number of tasks across industries such as earthmoving, construction, mining, road building, forestry and agriculture.
RELATED READ: 5 main types of earthmoving equipment and when to use them
To understand what they can do, it is important to know, first and foremost, the types of bulldozers available out there.
The John Deere K crawler dozer weighs in at around 43 tonnes.
By far the most commonly used and seen dozer types are crawler dozers, which use tracks to grip the ground, distribute the machines' weight and help them power through most types of terrain.
As tracks help reduce pressure to the ground, they help dozers stay afloat instead of sinking into softer materials like sand and mud.
Crawler dozers range in size from smaller models for lighter work, medium ones for general grunt-work and larger ones for moving massive amounts of material. The size and power of the models vary between manufacturers, but a general guide is:
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This low-ground-pressure (LGP) Cat D6 XE dozer uses 915mm centred shoes to put more track on the ground and deliver a low ground pressure of just 5 psi.
As the name suggests, 'swampies' are dozers made or modified to work in swampy, boggy or wet conditions.
Generally, this will involve the provision of extra-wide swamp tracks or LGP (low ground pressure) tracks with triangular or arc-style shoes which further distribute the dozer's weight and create buoyancy.
Other modifications for use in the wet can include long track frames, a wider machine gauge and the use of waterproof connectors, new relays and injection-moulded instruments.
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A Cat 824K wheel dozer dumping material onto a pile.
In situations where you need some speed and manoeuvrability, wheeled dozers will come in handy.
Wheeled dozers can travel up to three times faster than tracked units and are generally more manoeuvrable. However, because the weight is distributed at four points, the machine loses the power conversion and pushing power provided by tracks and won't perform as well on softer surfaces.
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An armoured Caterpillar D9R bulldozer used by the Israel Defense Force. Photo: Zachi Evenor
These are bulldozers built for serious work in war zones ' something that has been going since World War Two.
Among the features on military dozers are armoured cabs, rifle brackets, winches, emergency egress hatches in the roof, and fresh-water fording kits up to 1.5 metres. Some also have foldable blades and removable cabs for easy air transportation and quick deployment.
The blades can be replaced with military-spec work tools such as mine rakes, ploughs and rollers.
Cat has developed a remote-control retrofit for its D7R-II medium dozer which allows combat engineers to operate the machine from 400 metres away (line of sight) while staying safe from enemy fire, improvised explosive devices and the like.
Now that we have covered the different types of dozers, let's get straight to the main topic - what can we use them for?
The Dressta TD15R dozer blends brute force with precise control.
Want to push something out of the way? Get a bulldozer.
A dozer's primary function is to perform rough work in applications such as mining, site development and road construction. For this application, dozers are usually equipped with heavy metal blades that are strong enough to move mounds of dirt or other material; tracks that give excellent grip in all conditions; powerful engines as well as a torque divider to convert the engine's power into dragging ability.
A Cat D11T dozer with a single-shank giant ripper attached.
Many bulldozers have a long, claw-like device called a ripper on the rear that is used to break up the ground so it can be pushed or scooped away, leaving the ground clear for grading or ploughing.
Rippers can consist of a single shank ' or blade ' or in a multi-shank configuration of two or more.
A dozer being used to clear vegetation
It's generally agreed that the easiest way to clear land for agriculture is to use a large bulldozer.
Some ways this can be achieved are: simply pushing over smaller trees; pushing and scooping larger trees with well-established root systems; using chains to uproot stumps and boulders; and using a rake attachment to pull away and clear smaller debris and roots.
This work is often done in tandem with a tracked loader, excavator or backhoe loader. A tilted blade is often used for removing boulders and rocks.
A Komatsu D155AX-8 dozer equipped with a powerful winch. Photo: Komatsu
When you want to pull rather than push with your dozer, a winch is the answer. It can be used for a variety of purposes, including load towing, wreck recovery, uprooting stumps and pulling down trees. Two types of winches can be fitted to a bulldozer:
Hydraulic winch: This is driven by the dozer's hydraulic circuit and is ideal for when you need precise line speed control.
PTO winch: If your dozer has a PTO, this will provide faster speeds and more brute force than a hydraulic one.
Bulldozer winches are designed specifically for these machines, with a higher angle of departure than those built for other equipment, and a drum set higher and closer to the dozer. This means the machine can be driven uphill or on to a trailer without scraping the winch frame.
A US Army Engineer Brigade Cat D7R II dozer being used to push a scraper. Photo: Capt. Loyal Auterson
Dozers can be used for pushloading scrapers in situations where, for example, the scraper can't gain enough traction to make a deep cut, or where sandy material causes traction loss. Companies such as Caterpillar make cushion dozer blades designed for this purpose.
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A Cat D6 5EX dozer being used to build a fire containment line in the Moore River National Park. Photo: Aussie Oc
Many rural fire departments around the world use bulldozers to build bushfire containment lines. These are essentially dirt paths near fires designed to stop them from spreading further.
Dozers used for this purpose are often more compact models which are able to get as close as possible to the point of origin of a fire.
While blades are often used in this application, some organisations have resorted to rakes instead, which remove vegetation to create a mineral earth control line and leave much of the soil in place. This allows for faster post-fire rehabilitation.
Case introduced a purpose-built landfill configuration for its M landfill dozer this year. Photo: Case CE
Landfill management is possibly the toughest job a bulldozer can take on, so the machine needs a higher level of protection than normal.
Among the extra features on a landfill dozer are: guards for the radiator, engine compartment, crankcase and tilt cylinder lines; self-cleaning track shoes and protective guarding to prevent refuse from clogging up the undercarriage; blade trash racks; and an additional counterweight with drawbar.
The tracks are matched to site conditions to strike a balance between compaction and flotation.
A Dressta TD-15M dozer at work in a forest, Photo: Dressta
There are a number of forestry tasks for which dozers are ideally suited, including towing logs, heavy cutting and pushing, and loosening densely compacted materials.
Special features of forestry dozers include: cyclonic air filtration, reversible cooling fans, fire suppression systems, high capacity fuel tanks, protective guarding, winches and auxiliary hydraulics.
Dozers can be used to push and spread aggregate for road building purposes
Bulldozers are well suited to the spreading of aggregate and preparation of road beds.
Cat recommends the use of a medium dozer equipped with a VPAT (Variable Pitch Angle Tilt) blade, which allow the equipment to move material laterally in a rolling action. "This keeps granular material (such as CA-6) from segregating, providing optimum cohesion and compaction," Cat said.
The company added the VPAT blade is also useful in helping the dozer pull material from the edge of the roadbed or around other obstacles.
A John Deere 750J dozer equipped with a 3D machine control system from Position Partners. Photo: Position Partners
While dozers have traditionally been used for bulk work in Australia, with finish-grade or final-trim work being undertaken by graders, the use of 3D machine control technology is now extending the usefulness of bulldozers.
While they still can't handle extremely tight tolerances such as those in applications such as highway construction, dozers equipped with 3D machine control are more than capable of taking on jobs with 20mm-30mm tolerances such as batter slopes and sports fields.
A few years ago, Komatsu released the D375Ai-8 'intelligent' mining dozer. Komatsu Australia Mining Product Manager, Michael Hall, said the iMC version of the earthmover "can carry out both bulk and final trim dozing in fully automatic mode from start to finish, delivering final grade performance and accuracy'.
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Dozers, also known as bulldozers, have a large metal blade at the front and are designed for pushing and leveling various materials such as soil, rocks, and debris. While all dozers share a common purpose, there are different types, each tailored to specific tasks and terrain conditions. In this article, we will explore each types, highlight their distinctions, and shed light on the diverse applications for which they are utilized.
Crawler dozers, or track dozers, are the most common type of dozer and are characterized by their continuous tracks or "caterpillar" treads. These tracks distribute the machine's weight evenly, ensuring optimal traction and stability on rough and uneven terrains. Crawler dozers are highly versatile and widely used in construction, mining, and forestry applications. They excel at tasks such as clearing land, grading, and pushing heavy materials.
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Unlike crawler dozers, wheel dozers operate on wheels, offering enhanced speed and mobility on flat surfaces. These machines are often equipped with large, robust tires designed to provide traction on varied terrains. Wheel dozers are commonly employed in quarry operations, mining sites, and infrastructure projects where faster movement is required. Their ability to travel on public roads makes them suitable for projects that involve frequent relocation between job sites.
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Mini dozers, also known as compact dozers or mini loaders, are smaller in size and weight compared to traditional dozers. They are designed for applications where space is limited or maneuverability is crucial. Mini dozers are commonly used in landscaping, residential construction, and urban development projects. Their compact size allows them to navigate through narrow spaces and perform tasks such as grading, backfilling, and snow removal with ease.
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Angle dozers, also referred to as angle blade dozers, feature a blade that can be angled to the left or right. This unique blade design allows for more precise material control during pushing and grading operations. Angle dozers are commonly utilized in road construction, site preparation, and agricultural projects. The ability to angle the blade enhances efficiency when working on slopes, embankments, and uneven surfaces.
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Coal U-blade dozers, as the name suggests, are specifically designed for handling coal and other loose materials. These dozers have a large, curved blade that can carry a significant volume of material without spillage. The U-shaped design helps contain loose materials, allowing for efficient loading and transport. Coal U-blade dozers are primarily used in coal mines, open-pit mining operations, and stockpile management.
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Push dozers, also known as pushing-type dozers or cushion dozers, are specialized machines designed for pushing large volumes of material over long distances. They feature a unique blade design that allows them to gather and push materials efficiently. Push dozers are commonly employed in land reclamation, land clearing, and large-scale earthmoving projects. Their high productivity and material-moving capabilities make them invaluable in operations that require extensive pushing and spreading of material.
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Dozers play a vital role in the construction and earthmoving industries, providing exceptional pushing and leveling capabilities.
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Each type of dozer caters to specific tasks, terrains, and project requirements.
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From the versatility of crawler and wheel dozers to the agility of mini dozers, and the specialized functionalities of angle dozers, coal U-blade dozers, and push dozers, the diverse range of dozers ensures that there is always a suitable machine for every job.
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Want to know more about dozers? Learn about key features and capabilities, attachments, plus some advantages and limitations in Bulldozers: What you need to know. Also, find useful tips on what to look for when buying your next used dozer in this Buying Guide.
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View the used dozers in our inventory that we have available for you to buy now. If you don't see one here, there might be one listed in one of our upcoming auctions that could meet your needs.
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Don't currently see the dozer you're looking for? Tell us. We may know someone who has it to sell and is just waiting for a buyer. With our extensive network of contacts, it won't be difficult for us to find a dozer, or any other type of used equipment for you.
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This article is our representation of useful information and is not intended to be a complete guide for making the right decision for your company. Ask our experts - or your own - for specific advice based on your unique circumstances.
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