If you’ve ever stood beside a Delong dump truck rumbling down a construction site access road, or watched one hauling a full load of aggregate through a mountain pass, you’ve probably wondered: how fast can these workhorses actually go? As a Delong dump truck supplier who’s spent the last 12 years answering this exact question for mine operators, construction foremen, and small business owners across North America, I get asked this every single week. It’s not just a random curiosity—for anyone relying on these trucks to keep projects on schedule, knowing their top speed makes all the difference between on-time deliveries, wasted fuel, and even safety on the road or worksite. Let’s break this down like I’d break it down for a new client, no jargon, just real-world facts that matter. Delong Dump Truck
First, let’s get one thing straight: there’s no one-size-fits-all answer. Delong builds dump trucks for very different jobs. A 10-yard light-duty model, used for hauling mulch or small loads of gravel to residential job sites, isn’t going to hit the same speeds as a 70-yard heavy-duty mining hauler designed to climb 10% grades loaded with iron ore. That said, I’ve spent years testing, selling, and maintaining these trucks, so I can give you the ranges that are standard across their product lines, plus the factors that push those numbers up or down.
Starting with the most common model most of my customers ask about: the Delong DJ15, our best-selling medium-duty dump truck. This is the workhorse contractors use for roads, parking lots, and small construction projects—think hauling asphalt, concrete, or topsoil. Factory specs for the DJ15 list a maximum road speed of about 65 miles per hour (105 km/h) when unladen. But here’s the catch: when it’s fully loaded to its 15-yard capacity, that number drops to around 55 mph (88 km/h). I always tell new buyers not to get fixated on the unladen number, though. In real life, you’re almost never driving one of these empty. The weight of the load, plus the truck itself—around 28,000 pounds empty, so a full load adds another 22,500 pounds—slows it down, and more importantly, makes handling at higher speeds less safe on winding rural roads. Last year, I had a customer pick up his new DJ15 and try to drive it 70 mph on a two-lane highway, and he ended up with a ticket for reckless driving plus a warning from our service team about brake strain. The factory built that speed for empty runs to a job site or back to the yard, not for hauling full loads on public roads.
Now move up to the heavy-duty line, where most of our repeat customers are: the Delong HD65, used for major road projects, quarry work, and large-scale excavation. This is a 65-yard hauler, weighs over 55,000 pounds empty, and can carry up to 97,500 pounds of material. The factory says its top speed is 52 mph (84 km/h) unladen, and 40 mph (64 km/h) fully loaded. It sounds slow compared to a semi-truck, but let’s put that in context. A typical semi can hit 75 mph loaded, but that’s a 10,000-gallon tanker or a 48-foot trailer carrying 45,000 pounds, not a 160,000-pound dump truck with 12 rear wheels and a body built to withstand impact from rock and gravel. You don’t need to go faster than that in a dump truck, anyway. At quarries, the access roads are narrow and bumpy, with sharp turns, so going faster is dangerous. On highways, most states have a 55 mph speed limit for heavy commercial vehicles, so the HD65 hits that sweet spot for legal, safe operation.
The fastest Delong dump trucks we sell? Believe it or not, that’s our light-duty line, the Delong LD10. These 10-yard trucks are used for urban landscaping, small demolition jobs, and even waste hauling in dense cities, where you need maneuverability as much as power. The LD10 has a smaller frame, a 300-horsepower engine (compared to the DJ15’s 350 and the HD65’s 550), and a lighter curb weight, so its unladen top speed is 72 mph (116 km/h), and loaded it’s still around 62 mph (100 km/h). I’ve driven one of these on the highway to deliver a last-minute load of asphalt to a city job, and it cruised at 65 mph comfortably, no issues. But again, most urban routes have lower speed limits, so you’ll never push that speed in a busy area.
Now, let’s talk about the factors that change this number—because these factory specs are only a baseline, and over time, or with modifications, they can shift. First, the engine and transmission. Delong uses ZF transmissions on all its medium and heavy-duty trucks, which are built for torque (the pulling power needed to haul heavy loads) not raw horsepower for speed. For mining models, we offer optional transmission gearing that can bump unladen speed by 3-5 mph for long hauls between pit and processing plant, but most mines don’t want that—they prioritize grade-climbing ability over top speed, since they spend most of their time going up or down steep hills.
Then there’s terrain. I had a customer in Wyoming who runs HD65s for iron ore hauling on a flat, straight highway between the mine and the port. He told me his trucks regularly hit 43 mph fully loaded, 3 mph over factory spec, because there’s no wind or hills to slow them down. On the other hand, a customer in Colorado hauls over mountain passes, so his HD65s never go over 35 mph loaded, even on the straight parts, because the thin air reduces engine power at high altitudes. That’s a real thing—at 8,000 feet above sea level, a truck’s engine loses about 10% of its power, so top speed drops every time you go higher.
Load type also matters. If you’re hauling loose, light material like mulch or topsoil, a 65-yard truck might only weigh 120,000 pounds fully loaded, instead of the maximum 152,500 pounds of iron ore or crushed rock. That extra weight makes a difference. Last month, a customer hauling mulch in his DJ15 told me he hit 58 mph on a back road, compared to the 55 mph he gets with gravel. That’s a small difference, but for a project where you’re hauling 10 loads a day, that saves 10 minutes per load, adding up to 5 hours a week—huge for keeping a project on schedule.
I also get asked all the time: can you modify a Delong dump truck to go faster? Short answer: it’s not worth it. Delong designs every truck for a specific balance of speed, safety, and durability. If you chip the engine to add more horsepower to go faster, you’re putting extra stress on the brakes, suspension, and frame—parts that are built for standard loads and speeds. A friend who runs a fleet of dump trucks modified an old model a few years ago, and he had a brake failure on a downhill haul that totaled the truck and caused a minor accident. Delong’s service team has told me that every year, they see at least 10 trucks that were modified to go faster, with brake or transmission issues that would’ve been avoided if they’d stuck to factory specs. I never recommend modifying for speed—even if it sounds like a good idea for a few extra minutes a week.
Now, let’s get into the real-world use case that most of my customers care about: how does Delong’s speed compare to other brands? I’ve worked with almost every major dump truck brand over my 12 years in this business, and Delong’s speed specs are right in line, sometimes better, for their product lines. For example, the leading competitor’s 15-yard medium-duty truck has an unladen top speed of 62 mph, compared to Delong’s 65—so when you’re driving empty to a job site, Delong will get you there a few minutes faster. Their 70-yard mining hauler, though, has a top speed of 45 mph loaded, while Delong’s HD65 hits 40, but that’s because Delong prioritizes gradeability for steep mine sites, which is more important for mining work than top speed on flat roads.
Safety is another big part of the speed conversation. Dump trucks are large, heavy vehicles, even the light-duty models. Going faster means longer stopping distances. A standard passenger car going 60 mph can stop in about 120 feet; a fully loaded Delong HD65 going 50 mph needs almost 300 feet to stop. If you’re driving at 60 mph, that stopping distance jumps to over 400 feet—plenty of space between you and the car in front of you, but a dangerous gap if you’re following too close or hitting a surprise obstacle on the road. That’s why Delong builds their trucks to have top speeds that are practical for their size, not the highest possible.
I’ve also had customers ask about speed on worksites, not public roads. Delong dump trucks have a worksite speed limiter standard on all models, set to 25 mph for off-road use. That’s not a limitation—it’s a feature. Worksites are full of workers, small equipment, and uneven ground, and you don’t need to go faster than that to move material efficiently. Last year, a customer tried to turn off the worksite limiter on his DJ15 to haul faster between two parts of a residential development, and he hit a deep pothole, damaging the tire and the frame, which cost him $8,000 in repairs and a week of downtime. The limiter is there for a reason, and I always tell new operators never to disable it.
So what’s the bottom line for anyone looking to buy a Delong dump truck? If you’re hauling light loads on residential or urban routes, expect top speeds between 60 and 72 mph when empty, 55 and 62 mph when loaded. For medium-duty construction work, plan on 65 mph empty, 55 mph loaded. For heavy-duty quarry or mining work, expect 52 mph empty, 40 mph loaded. Keep in mind that real-world conditions—altitude, load type, terrain—will shift those numbers a little, but the factory specs are a reliable baseline for safe, efficient operation.
At the end of the day, the maximum speed of a Delong dump truck isn’t a number to brag about on the road. It’s a design choice built for the job your truck is meant to do. When you’re buying a dump truck, you care about how much it can haul, how reliable it is, and how much it costs to run—not how fast it can go. That’s what Delong has always focused on, and that’s why my customers keep coming back to me for new trucks every few years.
If you’re in the market for a Delong dump truck, or you have more questions about speed, specs, or finding the right model for your project, feel free to reach out to discuss your needs.
Stake Semi-trailer References:
- Delong Commercial Vehicles. (2022). Medium-Duty Dump Truck Product Specifications. Delong Technical Manual Series.
- National Highway Traffic Safety Administration. (2021). Commercial Vehicle Speed and Stopping Distance Guidelines. Federal Motor Carrier Safety Administration.
- Delong Mining Equipment Division. (2023). Heavy-Duty Hauler Operational Specs and Test Data. Delong Mining Technical Report.
- North American Construction Industry Fleet Association. (2022). Dump Truck Performance and Safety Standards. Fleet Operations Report.
Jining Yaochi Automobile Trading Co., Ltd.
With abundant experience, we are one of the most professional delong dump truck manufacturers in China. Please feel free to buy cheap delong dump truck made in China here from our factory. Quality products and reasonable price are available.
Address: Liangshan Industrial Park, Jining City, Shandong Province, China
E-mail: Yzhiying23@gmail.com
WebSite: https://www.yaochitruck.com/
