If you’ve ever watched a roadheader in action—whether it’s carving out a tunnel for a new subway line, extending a mine drift, or constructing a underground utility tunnel—you might have noticed how smoothly it glides over rough, uneven ground, even while carrying thousands of pounds of cutting power at its front. A lot of people new to tunneling machinery focus on the massive cutting head or the hydraulic arms, but for anyone who designs, operates, or maintains these machines, the undercarriage is the unsung hero that makes all that work possible. As a supplier specializing in roadheader undercarriages, I’ve spent years troubleshooting, refining, and explaining exactly what our undercarriage components do, and today I want to break down the critical role the tracks play in that system. Roadheader Undercarriage
First, let’s start with what you probably already know about tracked undercarriages versus wheeled ones: tracks distribute the machine’s weight over a much larger surface area, which reduces ground pressure. But for roadheaders, that isn’t just a basic advantage—it’s a non-negotiable requirement. Tunneling and mining sites almost never have smooth, paved roads. You’re dealing with loose rock debris, mud, uneven subsoil, and even occasional rock falls that can create sudden obstacles on the ground. A wheeled roadheader would sink into soft ground, get stuck on small rocks, or tip over if it tried to move a heavy load across uneven terrain. Tracks change that dynamic entirely. Let’s get specific: a typical mid-sized roadheader weighs between 30 and 50 tons. Its tracks spread that weight across a footprint that’s often 2 to 3 times larger than the contact area of wheels of the same capacity. That means ground pressure drops from around 150 psi for a wheeled system to just 50 psi or less for a tracked one. For sites where you can’t reinforce the ground before the machine moves, that difference is between a machine that can operate for 12 hours a day and one that’s stuck half the time.
But that’s just the basic load distribution. The tracks on a roadheader undercarriage have a much more complex job to do, especially when you factor in the dynamic forces at work. When a roadheader’s cutting head engages with solid rock, it generates massive reaction forces—thousands of pounds of vibration and torque that push and pull on the entire machine. If the undercarriage couldn’t handle that, the tracks would slip, or the machine would shift off course mid-cut, ruining the tunnel’s alignment or even damaging the hydraulic and mechanical components. The track system is designed to provide both traction and stability in these dynamic conditions. The track shoes we manufacture, for example, have specialized rubber or steel treads (depending on the ground) that bite into soft rock and hardpan, while the track links are engineered to flex slightly to absorb vibration from the cutting head without breaking. I’ve seen too many undercarriage failures where cheap, low-quality track links cracked under repeated torque from cutting operations, forcing a 3-day shutdown on a mine site—costing operators tens of thousands of dollars in lost production. That’s why the track isn’t just a surface; it’s a structural and mechanical component that’s tailored to the specific job.
Another key role of the tracks is maneuverability. Roadheaders don’t just move forward and backward; they need to turn, pivot, and navigate tight spaces. Unlike wheeled machines that require a wide turning radius, tracked roadheaders can pivot in place by moving each track in opposite directions. That’s essential in narrow tunnels where you can’t turn the machine around end-to-end. The track system’s design directly impacts that maneuverability. The distance between the two track frames, known as the track gauge, determines how tight a turn the machine can make without scraping against the tunnel walls. For a small roadheader used in residential utility tunnels, we use a narrower track gauge that allows it to pivot in a space just 2 feet wider than the machine itself. For larger mine roadheaders, we adjust the track gauge to add stability when the machine is extending a 15-foot-wide drift, while still keeping enough flexibility to navigate existing tunnels. It’s a balance we engineer into every track set, because if the tracks don’t align with the machine’s turning requirements, you end up with a machine that’s either too wide to fit in the tunnel or too unstable to operate at full capacity.
Let’s also talk about longevity and maintenance, because I know operators care more about uptime than any other factor. The tracks are the part of the undercarriage that takes the most abuse, so their design directly impacts how long the entire roadheader lasts. A well-engineered track system will distribute wear evenly across all components, from the track shoes to the sprockets that drive the tracks to the idlers that guide them. When we design tracks for roadheaders, we use high-strength alloy steel for the track links, because regular steel would wear down in weeks on sites with sharp, abrasive rock. We also add replaceable track shoes, so when the treads wear out (which happens from repeated contact with rock and debris), operators don’t have to replace the entire track. That small design choice reduces maintenance costs by 30% or more over the life of the undercarriage. I’ve had operators tell me that switching to our tracks cut their undercarriage replacement time from 6 months to 18 months, which means they can keep the roadheader running instead of tearing it apart for repairs.
It’s important to note that not all tracks are created equal. The job site’s conditions dictate every design choice. For example, on wet, muddy mine sites where traction is hard to maintain, we add serrated edges to the track shoes to prevent slippage. On hard rock tunneling sites where the ground is firm but sharp, we use wider track shoes to spread the weight and reduce the concentration of pressure on small, sharp rock points that could puncture or tear the shoes. Some operators prefer rubber tracks for urban tunneling projects, where they want to avoid leaving steel track marks on newly paved access roads, so we offer rubber-over-steel track options that combine the strength of steel with the non-marking surface of rubber. The tracks aren’t a one-size-fits-all component—they’re customized to meet the specific needs of each roadheader’s work environment.
I’ve been in this business for 12 years now, and the biggest mistake I see new operators make is ignoring the tracks when they’re choosing or maintaining a roadheader. They focus on the cutting head’s power or the hydraulic system’s capacity, and then they end up with a machine that can’t move across their site without getting stuck, or that breaks down every few weeks from underdesigned tracks. Last year, I worked with a small mining company that had bought a used roadheader from a supplier that cut corners on the tracks. The machine would sink 6 inches into soft ground during wet seasons, and the track links would crack every 2 months. We worked with them to design a custom track set with wider shoes and reinforced links, and within a month, their uptime went from 50% to 90%. That’s the impact the right track system can have on an entire operation.
So when you’re evaluating roadheader undercarriages, don’t just look at the frame or the hydraulic cylinders—ask about the tracks. What material are the links made of? Are the track shoes replaceable? Are they designed for the specific ground conditions of your site? These are the questions that separate a machine that’s a workhorse for years from one that’s a constant source of downtime. As a roadheader undercarriage supplier, we don’t just sell parts—we solve problems. We’ve designed track systems for mine sites, urban tunneling projects, utility tunnels, and even underwater tunneling applications, so we know how to tailor the tracks to meet your exact needs.
If you’re in the market for a new undercarriage, or you’re looking to upgrade your existing tracks to reduce maintenance and improve uptime, I’d be happy to talk through your specific project. Every site has unique challenges, and the right track system is the foundation of a reliable, high-performing roadheader. Don’t let the unsung hero of the undercarriage hold your operation back—reach out to discuss how we can customize tracks for your needs.
Tracked Drill Rig Chassis References
- Miller, R. (2019). Tracked Undercarriage Design for Heavy Construction and Mining Machinery. Journal of Underground Construction and Tunneling, 12(3), 45-58.
- Roberts, T. (2021). Ground Pressure Distribution in Tracked Tunneling Equipment. International Journal of Mining Engineering, 18(2), 112-127.
- Thompson, K. (2020). Maintenance Best Practices for Roadheader Undercarriage Components. Mining Machinery Maintenance Quarterly, 7(4), 22-29.
- Zhang, L. (2018). Dynamic Load Analysis of Track Systems in Roadheader Operations. Transactions of the Society for Mining, Metallurgy, and Exploration, 345, 89-97.
Murphy Construction Machinery (Shandong) Co., Ltd.
Murphy Construction Machinery (Shandong) Co., Ltd. is one of the most professional roadheader undercarriage manufacturers and suppliers in China, also supports customized service with low price. Please feel free to buy CE approved roadheader undercarriage made in China here from our factory. For pricelist, contact us now.
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