A haul truck is a massive off-highway vehicle built specifically to move earth, rock, and ore across mining sites, quarries, and large construction projects. These machines dwarf anything you’d see on a public road. The largest production model, the BelAZ 75710, carries a payload of 450 metric tonnes (about 992,000 pounds) and weighs over 800 tonnes when fully loaded. Even mid-size haul trucks routinely handle loads that would crush a standard highway dump truck.
How Haul Trucks Differ From Regular Dump Trucks
Standard dump trucks are licensed for public roads and carry relatively modest loads, typically under 30 tonnes. Haul trucks are a completely different class of equipment. They’re designed for constant operation in harsh, remote environments like open-pit mines, where they run around the clock hauling blasted rock up steep grades. Everything about them is oversized: the tires on the largest models stand over 13 feet tall (about 4 meters in diameter), and the truck beds can hold more than 260 cubic meters of material.
Because they never touch a public highway, haul trucks aren’t bound by road-legal weight limits. This lets engineers prioritize raw hauling capacity and durability over anything else. The frames are built to absorb constant shock from uneven terrain, and the powertrains are engineered for low-speed, high-torque work on grades that would stall a conventional truck.
Rigid Frame vs. Articulated Designs
Haul trucks come in two fundamental designs, and the choice between them depends almost entirely on the terrain they’ll work in.
Rigid-frame haul trucks have a single solid chassis. They’re the workhorses of large, well-organized mining operations with long, maintained haul roads. On firm, consistent surfaces, rigid trucks offer the highest payloads and fastest cycle times. The tradeoff is that they need stable, well-maintained roads to operate safely and efficiently. Poor road conditions increase tire wear, cause structural damage, and slow everything down.
Articulated haul trucks have a pivot point between the cab and the dump body, giving them a tighter turning radius and far better handling on rough ground. They use permanent all-wheel drive and heavier suspension systems, which lets them work in mud, on steep slopes, and across soft or uneven terrain without requiring extensive road construction. The cost is lower top speeds and a higher cost-per-tonne compared to rigid trucks running in ideal conditions.
The decision often comes down to a simple question: if you have long, dry, well-maintained haul roads, rigid trucks are more efficient. If the terrain is steep, wet, or unpredictable, articulated trucks deliver more reliable uptime.
Engine Power and Drivetrain
Haul trucks use industrial diesel engines that produce anywhere from around 550 horsepower in mid-size models to 4,600 horsepower in the largest ultra-class machines. A mid-range model like the Caterpillar 772, for example, runs an 18.1-liter diesel engine producing roughly 550 to 605 horsepower, paired with a seven-speed automatic transmission.
The largest trucks use a different approach entirely. Instead of a traditional mechanical drivetrain, many ultra-class models use diesel-electric drive systems. The diesel engine powers electric generators, which in turn drive electric motors at each rear wheel. This eliminates the need for a massive conventional transmission and gives the truck smoother, more controllable power delivery under extreme loads. The BelAZ 75710 uses two 16-cylinder diesel engines producing a combined 4,600 horsepower to move its 810-tonne gross weight at speeds up to 64 km/h (about 40 mph).
Size Classes and Payload Range
Haul trucks span a wide range of sizes. Smaller models carry 30 to 50 tonnes and work in quarries, road construction, and smaller mining operations. Mid-range trucks handle 50 to 150 tonnes and are common in large surface mines. Ultra-class trucks, the giants of the industry, carry 200 to 450 tonnes and are found only in the world’s largest mining operations.
The ten largest production haul trucks all carry payloads above 200 tonnes. At the top of the scale, the BelAZ 75710 holds the record at 450 tonnes. Competitors from Caterpillar and Komatsu produce ultra-class models in the 300 to 400-tonne range. These trucks are so large that their dump beds can comfortably hold the volume of a small apartment.
Tires and Operating Costs
Tires are one of the most significant ongoing expenses for any haul truck operation. On ultra-class models, a single tire can cost $40,000 to $100,000 or more depending on size and manufacturer. The largest tires currently made for rigid haul trucks measure about 59/80R63 in tire-industry sizing, which translates to an outer diameter of roughly 4 meters (over 13 feet). Each truck uses four to six of these tires, and they wear out faster than you might expect given the constant heavy loads and abrasive surfaces they roll across.
Fuel consumption is equally staggering. A large haul truck can burn through 50 to 80 gallons of diesel per hour during operation. Over a truck’s lifetime, fuel and tires together often represent the largest share of total operating costs, sometimes exceeding the original purchase price of the machine several times over.
Maintenance and Lifespan
A well-maintained haul truck typically lasts 30,000 or more operating hours, with exceptional maintenance programs pushing useful life past 35,000 hours. For a truck running two or three shifts daily, that translates roughly to 10 to 15 years of service.
Reaching those numbers requires a structured cycle of increasingly major overhauls. Around every 2,500 hours, the transmission, axles, and differentials get a full service. At approximately 7,500 hours, the engine gets a complete rebuild. By 10,000 hours, the truck undergoes a major restoration covering the transmission, suspension, and dump body. At 17,500 hours, essentially everything gets rebuilt: engine, transmission, and hydraulics are professionally restored to keep the truck performing at mining standards.
These overhaul cycles are critical because downtime on a haul truck is extraordinarily expensive. When a 400-tonne truck stops moving, the entire production chain at a mine slows down. Mining companies invest heavily in predictive maintenance, using sensors embedded throughout the truck to monitor engine temperatures, tire pressures, brake conditions, and structural stress in real time.
Autonomous Haul Trucks
One of the biggest shifts in the haul truck industry is the move toward fully autonomous operation. Self-driving haul trucks use GPS, radar, and onboard computers to follow pre-programmed routes through a mine without a human operator in the cab. Major manufacturers including Caterpillar and Komatsu have been deploying autonomous haulage systems at mines in Australia, South America, and North America for over a decade.
The appeal is straightforward: autonomous trucks can run continuously without shift changes, don’t suffer from fatigue-related accidents, and follow optimized routes that reduce fuel consumption and tire wear. They also remove human operators from one of the most dangerous work environments in mining. Adoption has been steady, with fleets growing as the technology proves reliable in increasingly varied conditions.
Who Makes Haul Trucks
The haul truck market is dominated by a handful of heavy-equipment manufacturers. Caterpillar and Komatsu are the two largest players, producing everything from mid-size quarry trucks to ultra-class mining haulers. Hitachi, Liebherr, and BelAZ round out the top tier, with BelAZ holding the record for the largest production model. Volvo Construction Equipment is a major manufacturer of articulated haulers specifically, offering models well-suited for construction and smaller mining applications.
Choosing a manufacturer often depends on the existing fleet at a mine site, since standardizing on one brand simplifies parts inventory and mechanic training. Dealer support networks also play a major role, particularly for remote operations where getting a replacement part quickly can mean the difference between a few hours of downtime and several days.