A Practical Undercarriage Parts Compatibility Guide: 5 Checks to Avoid Costly Mismatches in 2025

Abstract

Ensuring the correct fitment of undercarriage components is a foundational aspect of heavy machinery maintenance, yet it remains a frequent source of costly operational failures. This guide examines the multifaceted challenge of undercarriage parts compatibility for equipment such as excavators and dozers. It addresses the significant financial and logistical repercussions of mismatched components, including accelerated wear, catastrophic failure, and extended machine downtime, which are particularly acute in the demanding operational environments of Africa, Australia, the Middle East, and Southeast Asia. The analysis focuses on key components like track rollers, carrier rollers, track chains, front idlers, and sprockets. It proposes a systematic, five-step verification process that empowers equipment owners and technicians to navigate the complexities of OEM and aftermarket part selection. By synthesizing mechanical principles, manufacturer specifications, and practical field experience, this document provides a robust framework for making informed decisions, thereby enhancing machine longevity, optimizing performance, and safeguarding the economic viability of heavy equipment fleets.

Key Takeaways

• Always begin by verifying the machine's make, model, and full serial number.
• Accurately measure critical dimensions like track chain pitch and roller diameter.
• Consult both original manufacturer manuals and detailed supplier data sheets.
• Utilize a structured undercarriage parts compatibility guide to ensure correct selection.
• Analyze ground conditions and job application to choose the right part specifications.
• Inspect wear on old components for clues about underlying alignment issues.
• Replace undercarriage parts as a complete system to ensure even wear.

Table of Contents

• Check 1: Verifying Machine Identity – The Foundational Step
• Check 2: Mastering the Measurements – A Game of Millimeters
• Check 3: Consulting the Source – OEM Manuals and Supplier Data
• Check 4: Analyzing the Environment and Application
• Check 5: Inspecting the Old for Clues to the New
• Frequently Asked Questions (FAQ)
• Conclusion
• References

Check 1: Verifying Machine Identity – The Foundational Step

The process of selecting a replacement part for your heavy machinery's undercarriage begins not in a parts catalog or on a supplier's website, but with the machine itself. It is a dialogue with the physical identity of the equipment. To treat this initial step as a mere formality is to build one's house upon the sand. The entire structure of a successful repair, the very integrity of the machine's future operation, rests upon the accurate identification of its unique specifications. The world of heavy equipment is one of constant iteration; manufacturers frequently introduce running changes within a single model's production life. A dozer produced in January may have subtle but meaningful differences from one that rolled off the assembly line in November of the same year. Ignoring this reality is a direct path to acquiring a part that is almost right, which in mechanical terms, is entirely wrong.

The Critical Trio: Make, Model, and Serial Number

Imagine you are trying to find a specific person in a large city. Knowing their last name (the 'Make', e.g., Caterpillar, Komatsu) is a start. Knowing their full name (the 'Model', e.g., 320D) gets you closer. But to find their exact address, you need a unique identifier, something that distinguishes them from every other person with the same name. In the world of machinery, this is the Serial Number.

The make and model provide the general blueprint. They tell a parts supplier the basic architecture of your machine—its size class, its intended purpose, its family of components. Yet, the serial number is the machine's specific DNA. It encodes information about the production date, the factory of origin, and, most importantly, the exact bill of materials used for its assembly on a particular day. For instance, a manufacturer might switch from a sealed and lubricated track (SALT) chain to a different design halfway through a model's production run. Without the serial number, a supplier might provide the earlier version, which would not be compatible with the later-style sprockets and rollers, leading to premature failure. The serial number resolves this ambiguity, transforming a general parts query into a precise request. It is the key that unlocks the exact parts book page relevant to your specific machine, not just your model in general.

Where to Find Your Machine's Serial Number Plate

Locating the serial number, or Product Identification Number (PIN) plate, can sometimes feel like a small treasure hunt, but its location is generally standardized. For most excavators and dozers, you should look on the machine's frame.

On an excavator, the primary PIN plate is typically located on the chassis, often on the right side, just forward of the cab or near the base of the boom. You might find it stamped into the main frame, visible when standing beside the track. A secondary plate is often placed inside the operator's cab, perhaps on the dashboard or door frame, for easier reference.

On a dozer or crawler loader, the most common location is on the rear of the machine, stamped into the main frame or the bevel gear case. Look around the area where the ripper would be mounted. Similar to excavators, a secondary, more accessible plate is usually present within the cab.

These plates can become obscured by dirt, grease, or paint over the years. It is a worthwhile endeavor to clean this plate carefully with a degreaser and a soft brush. Taking a clear photograph of it with your phone creates a permanent, easily accessible record that you can send to parts suppliers, eliminating any chance of transcription error. Think of this small act of cleaning and documentation as the first investment in a successful repair.

The Perils of Assumption: Why "Close Enough" Isn't Good Enough

Let us consider a hypothetical but deeply realistic scenario. An operator of a mid-size dozer in a remote quarry in Western Australia needs a new front idler. The machine is a popular model, a "Dash 5" version. The operator, under pressure to get the machine running, calls a supplier and simply requests a "front idler for a Model X-5 dozer." The supplier, acting on incomplete information, sends an idler. The part arrives after a week of costly downtime. During installation, the technician discovers the mounting brackets are off by 10 millimeters. The supplied idler was for an early series "Dash 5," while the quarry's machine is a late-series model, for which the manufacturer had slightly redesigned the track frame.

The consequences now cascade. The machine remains idle, a non-earning asset. The incorrect part must be shipped back, incurring further freight costs. The correct part must be identified and ordered, initiating a new waiting period. The total downtime could stretch into weeks, with costs far exceeding the price of the part itself. This entire costly episode could have been avoided by performing the foundational act of verification: locating the serial number and providing it with the initial request. The assumption that "all X-5s are the same" proved to be a profoundly expensive mistake. This story, in various forms, plays out every day in the industry. It serves as a stark reminder that in the precise world of mechanical engineering, approximation is the enemy of reliability.

Check 2: Mastering the Measurements – A Game of Millimeters

Once the machine's identity is firmly established, the next phase of our investigation requires a more hands-on, empirical approach. We must engage with the components themselves, speaking their language of dimensions. While a serial number can guide us to the correct parts manual page, physical measurements serve as the ultimate confirmation, a crucial cross-reference that can catch discrepancies between documentation and the reality on the ground. This is especially true for older machines that may have been modified over their lifespan, or when mixing components from different suppliers. In the domain of the undercarriage, where parts must mesh and move in high-friction, high-stress harmony, a few millimeters of difference is not a small error; it is a fundamental incompatibility.

Note: These values are illustrative and can vary significantly by manufacturer and model. Always measure your specific parts.

The Language of Links: Understanding Track Chain Pitch

The single most important measurement in the undercarriage system is the track chain pitch. What is pitch? It is the center-to-center distance from one track pin to the next. Imagine the track chain as a very large bicycle chain; the pitch is the length of a single link. This dimension dictates how the chain's bushings will engage with the teeth of the sprocket and the rolling surface of the idlers and track rollers.

To measure pitch accurately, you must measure over a span of several links and then average the result. Lay a section of the track chain flat and straight. Using a tape measure, find the center of the first pin. Now, measure to the center of the fifth pin (spanning four links). Divide this total measurement by four. For example, if the distance from the center of pin 1 to the center of pin 5 is 864mm, your pitch is 864 / 4 = 216mm. Measuring over a longer distance minimizes the impact of any single small measurement error.

Why is this so critical? Let us visualize the interaction. The sprocket's teeth are spaced to perfectly accept the bushings of a chain with a specific pitch. If you install a new chain with a slightly longer pitch onto a worn sprocket (or vice-versa), the bushing will not land perfectly in the valley between the teeth. Instead, it will ride up on the tooth face, causing a grinding, high-impact motion instead of a smooth, rolling engagement. This phenomenon, known as "pitch mismatch," drastically accelerates wear on both the sprocket teeth and the chain bushings, potentially destroying both new components in a matter of hundreds of hours, not thousands. It is the mechanical equivalent of walking in shoes that are a half-size too small; every step creates a point of painful, damaging friction.

Roller and Idler Specifications

The rollers—both the track rollers that carry the machine's weight on the track and the carrier rollers that support the top of the track loop—have their own critical dimensions. The most obvious is the diameter of the rolling surface. A replacement roller must match the original diameter to ensure the machine sits level and the track chain is properly supported.

Beyond diameter, one must consider the flange height and profile. The flanges are the raised edges on the roller that guide the track chain and prevent it from slipping off. A mismatch in flange height or shape can lead to improper guidance, causing wear on the sides of the track links. The shaft or bore diameter is also paramount; this determines if the roller will physically fit onto the mounting points on the track frame.

The front idler, which guides the track chain onto the rollers and helps set the track tension, has similar requirements. Its overall diameter, tread width, and the dimensions of its mounting assembly (the yokes and brackets) must be an exact match. An idler with the wrong offset can misalign the entire track, leading to chain jumping and severe damage to all other undercarriage components.

Sprocket and Segment Geometry

The sprocket, or sprocket segment on larger machines, is the driving force of the undercarriage. Its compatibility is non-negotiable. The primary concern, tied directly to the chain, is the pitch diameter, which is a function of the tooth count and the pitch it is designed for.

Beyond pitch, the bolt pattern is crucial. The sprocket must bolt securely to the final drive hub. You must verify the number of bolt holes, the diameter of the holes, and the Bolt Circle Diameter (BCD)—the diameter of an imaginary circle running through the center of all the bolt holes. A mistake here means the part simply cannot be installed.

For segmented sprockets, which are common on dozers and large excavators, you must also confirm the number of segments required to form a full circle. While this seems obvious, some systems may use five, six, or even seven segments, and they are not interchangeable. Each segment is a piece of a puzzle; you must have the right number of correctly shaped pieces for the puzzle to be complete. Taking these measurements provides a physical "fingerprint" of the parts you need, a fingerprint you can then use to find a perfect match.

Check 3: Consulting the Source – OEM Manuals and Supplier Data

After identifying the machine and taking meticulous measurements, the investigation moves from the field to the archives. We must now cross-reference our findings with the authoritative texts that govern the world of parts: the manufacturer's own documentation and the detailed catalogs provided by reputable aftermarket suppliers. This step is about bridging the gap between the physical object in your workshop and the abstract world of part numbers and specifications. It is an act of translation, ensuring that the "216mm pitch chain" you measured is correctly identified as "Part Number 8J-5678" in the system.

Your Machine's Birth Certificate: The OEM Parts Manual

The Original Equipment Manufacturer (OEM) parts manual is the foundational document for your machine. It is, in essence, the machine's birth certificate and anatomy chart rolled into one. For the specific serial number you identified in the first check, this manual provides exploded-view diagrams and corresponding parts lists. These diagrams, like those found on resources like ConEquip Parts, are invaluable. They allow you to visually identify each component—every track roller, the front idler assembly, each segment of the sprocket—and find its official OEM part number.

How does one access these manuals? The most direct route is through an official dealer for your machine's brand. Many manufacturers, such as Caterpillar, also offer online portals where owners can register their equipment and access digital parts books (). These digital tools are particularly powerful, as they are often updated with the latest parts information and supersessions (when an old part number is replaced by a new, improved one). The OEM part number is the "gold standard" identifier. It is the name given to the part by its creator, and it serves as the universal key for any further searches.

The Aftermarket Advantage: Leveraging Supplier Expertise

While the OEM provides the original blueprint, the aftermarket provides a world of options, often with significant benefits in cost and availability. High-quality aftermarket manufacturers specialize in producing components like track chains and rollers that meet or even exceed OEM specifications. The key is to partner with a reputable supplier who invests in their own engineering and quality control.

A good aftermarket supplier does more than just sell parts; they provide expertise. Their catalogs and websites are vast repositories of compatibility information. They have done the hard work of cross-referencing thousands of OEM part numbers against their own product lines. This means you can take the OEM part number you found in the manual and use it to find a direct, guaranteed-to-fit replacement. Furthermore, these suppliers are experts in their niche. A company that focuses solely on undercarriage can often offer insights that a generalist dealer might not possess, especially regarding wear life in specific applications. Reputable suppliers offer extensive catalogs, often accessible online, detailing their range of high-quality undercarriage parts, allowing you to meticulously compare specifications before purchasing.

Cross-Referencing Part Numbers: The Detective Work

This is where all the pieces of the puzzle come together. The process is a simple but powerful form of detective work:

1. Start with the OEM Part Number: From the official parts manual, you have the unique identifier for the track chain, sprocket segment, or carrier roller you need.
2. Consult the Aftermarket Supplier: Go to your chosen supplier's website or catalog. Most will have a cross-reference tool or search function.
3. Enter the OEM Number: Input the OEM number. The system should return the supplier's corresponding part number for the equivalent component.
4. Verify the Specifications: Do not stop there. A good supplier will list the critical dimensions for their part—the pitch, the number of links, the bolt pattern. Compare these listed specifications with the physical measurements you took in Check 2.

This final verification provides a three-way confirmation. The OEM manual tells you what should be on your machine. Your measurements tell you what is on your machine. The supplier's data confirms that the part they are offering matches both. When all three align, you can place your order with a very high degree of confidence, knowing that you have navigated the complexities of the undercarriage parts compatibility guide and are on the path to a successful repair.

Check 4: Analyzing the Environment and Application

A mechanically compatible part is one that fits. A truly suitable part is one that performs. The fourth check in our guide moves beyond the static dimensions of the components and into the dynamic world in which the machine operates. The undercarriage does not exist in a vacuum; it is in constant, abrasive contact with the earth. The nature of that earth, and the work being asked of the machine, exerts a profound influence on the longevity and performance of its undercarriage. Choosing the right part is not just about matching a part number; it is about matching the part's material properties and design to the specific challenges it will face. This is particularly relevant for operations across the diverse and demanding terrains of Africa, the Middle East, and Australia.

Soil and Rock: Matching Parts to Ground Conditions

Let us consider the fundamental difference between two common environments. The first is a land-clearing project in the soft, loamy soils of Southeast Asia. The second is a mining operation in the hard, sharp granite of a Pilbara quarry in Australia. A standard undercarriage might perform admirably for thousands of hours in the first scenario. In the second, it would be torn to shreds in a fraction of that time.

This is because different ground conditions create different types of wear.

• Abrasive Wear: This is caused by hard, sharp particles like sand, grit, and crushed rock. These particles create a grinding paste that erodes the metal surfaces of links, rollers, and sprockets. For high-abrasion environments, one must seek out parts with superior surface hardness. This involves looking for components made from steel alloys with high carbon and manganese content, which have been subjected to specialized heat treatment processes like induction hardening to create a deep, wear-resistant case.
• Impact Wear: This occurs when the machine travels over large, hard objects like boulders or demolition debris. The shock loads can cause chipping, cracking, or "spalling" of the metal surfaces. In high-impact applications, toughness is as important as hardness. A part that is too hard can be brittle, like glass. The ideal component has a hard outer surface to resist abrasion, but a softer, more ductile core that can absorb impact energy without fracturing. This is a hallmark of advanced metallurgy and quality manufacturing.

For these reasons, many manufacturers offer different grades of components. For example, you might choose "Extreme Service" or "Super Extreme Service" track shoes, which feature more material and a harder alloy, for work in shot rock. The small additional upfront cost is repaid many times over in extended wear life.

High-Impact vs. Low-Impact Work

The specific job application also dictates the stresses placed on the undercarriage. A dozer engaged in "ripping," tearing through compacted earth or soft rock, places immense and continuous strain on the track chains and sprockets. The torsional forces are extreme. In contrast, an excavator used primarily for loading loose gravel from a stockpile onto trucks is a much lower-impact application.

For high-impact work, like demolition or rock breaking, every component is under duress. The track rollers must withstand constant jolts. The track adjuster assembly, which maintains proper track tension, is subjected to immense pressure spikes. In these cases, selecting components known for their robust construction is key. This might mean choosing rollers with thicker shells and stronger seals, or a track adjuster with a heavy-duty recoil spring. Conversely, for a low-impact job, a standard-duty component may be perfectly adequate and more cost-effective. Understanding the intensity of your work allows you to make a more nuanced and economical choice, avoiding the trap of either over-specifying or under-specifying your parts.

The Climate Factor: Considerations for the Middle East, Southeast Asia, and Africa

The final layer of this analysis is climate. The extreme heat of a Dubai construction site, the high humidity of a Malaysian forestry operation, and the fine, airborne dust of a Namibian mine each present unique challenges.

• Heat: Extreme ambient temperatures can accelerate the breakdown of lubricants within sealed components like rollers and idlers. High-quality seals, made from materials like Viton that can withstand higher temperatures without becoming brittle, are a crucial feature to look for. Heat also affects the tempering of the steel; parts not correctly manufactured for these conditions can lose their hardness over time.
• Moisture and Corrosion: In humid, coastal, or swampy environments, rust is a constant enemy. It can seize track pins, degrade adjuster mechanisms, and weaken structural components. Look for parts with superior coatings and, more importantly, advanced seal designs that prevent water and mud from entering the internal moving parts of the track chain pins and bushings. A sealed and lubricated track (SALT) chain is designed precisely for this purpose, keeping abrasive materials out and lubricant in.
• Dust: Fine, abrasive dust is perhaps the most insidious enemy of the undercarriage. It can work its way past even the best seals. In these conditions, the quality of the seals on your track rollers, carrier rollers, and front idlers is paramount. Duo-Cone seals, a common design, provide an excellent barrier, but their effectiveness depends on the precision of their manufacturing and the quality of the materials used. Investing in premium rollers with superior sealing technology can dramatically extend undercarriage life in dusty climates.

By thoughtfully considering the interplay of ground, application, and climate, you elevate your parts selection from a simple matching exercise to a strategic decision that directly impacts your machine's resilience and your operation's bottom line.

Check 5: Inspecting the Old for Clues to the New

The final check in our comprehensive undercarriage parts compatibility guide involves turning our attention to the components being replaced. The old, worn-out parts are not merely scrap metal; they are a historical record. They tell a story of the stresses they have endured, the alignment of the system, and potential underlying problems. To discard them without a thorough examination is to throw away a valuable diagnostic report. By "reading" the wear patterns on the old components, you can identify issues that, if left uncorrected, will quickly damage the new parts you are about to install. This forensic approach ensures that your investment in new steel is not wasted.

Reading the Wear Patterns

Uniform wear is the sign of a healthy, well-aligned undercarriage system. When components are replaced after a long service life and show even, predictable wear, it is a good indication that the system is functioning correctly. However, abnormal wear patterns are red flags, signaling a deeper problem.

Consider a set of track rollers. If the rollers are worn significantly more on one side of the flange than the other, it points to a track frame alignment issue. The track frame may be bent or twisted, forcing the chain to ride against one side of the rollers. Simply replacing the rollers without addressing the alignment will cause the new rollers to fail in the exact same way.

Similarly, examine the teeth on the old sprocket. Are they worn evenly on both the forward-drive and reverse-drive sides? Or is one side hooked and sharpened while the other looks almost new? This can indicate an operational issue, such as the operator primarily traveling in one direction, but it can also point to a problem with track tension. If the sprocket teeth are worn to sharp points at the tips, it is a classic sign of running with a chain that has "stretched" (i.e., the pitch has increased due to pin and bushing wear) for too long. Installing a new chain on such a sprocket would be a grave error, as the pointed teeth would rapidly destroy the new bushings.

The "System" Approach to Replacement

This leads to one of the most fundamental principles of undercarriage maintenance: components wear as an integrated system. As Caterpillar (2024) notes, the entire undercarriage is designed to work and wear together. The pitch of the track chain, as it wears, slowly increases. The sprocket teeth, in turn, wear to match this changing pitch. The rollers and idlers lose diameter.

Because of this symbiotic wear, it is often a false economy to replace only one part of the system. Let's revisit the example of placing a new, in-spec track chain onto a half-worn sprocket. The new chain has a precise 216mm pitch. The worn sprocket, however, has adapted to the old, stretched chain and now has an effective pitch of, say, 218mm. The mismatch is immediate and severe. The new chain bushings will not seat properly in the sprocket roots, causing grinding, jumping, and a catastrophic rate of wear for both components.

The wise approach is to measure the wear on all major components and replace them as a matched set. If the sprockets and chains are more than 50% worn, they should almost always be replaced together. While the upfront cost of replacing a full set of excavator track components is higher, the total cost of ownership is far lower. A holistic replacement strategy ensures balanced wear, maximizes the life of all parts, and prevents the costly downtime caused by the premature failure of a single, mismatched component.

Documenting the Disassembly

The final act of this inspection phase is documentation. As you or your technician disassembles the old undercarriage, take photographs. Note the order of shims, the configuration of guards, and the routing of any hydraulic lines for the track adjuster. These details can be surprisingly easy to forget during the course of a multi-day repair.

A simple series of photos on a smartphone can serve as an invaluable reassembly guide. It helps confirm the orientation of the new front idler yoke or ensures that the master pin on the new track chain is installed in the correct position. This simple habit prevents frustrating and time-consuming mistakes during the final, critical stage of installation. By treating the old parts as a source of vital information and replacing components as a coherent system, you are not just changing parts—you are restoring the integrity and longevity of the entire undercarriage.

Frequently Asked Questions (FAQ)

Can I mix and match undercarriage parts from different brands?

While technically possible, it requires extreme caution. The primary risk lies in minute manufacturing tolerance differences between brands, even if they claim to be compatible. For optimal performance and to ensure components wear together as a system, it is highly recommended to use a complete set of parts from a single, reputable manufacturer, whether it is the OEM or a trusted aftermarket supplier. If mixing is unavoidable, a rigorous application of the measurement and verification steps outlined in this undercarriage parts compatibility guide is absolutely essential.

What is track pitch and why is it so important for compatibility?

Track pitch is the center-to-center distance between two adjacent pins in the track chain. It is the most critical dimension for compatibility because it dictates how the track chain's bushings engage with the teeth of the sprocket. A mismatch of even a few millimeters will cause the bushings to ride up on the sprocket teeth instead of seating smoothly in the root, leading to rapid, destructive wear of both the new chain and the sprocket.

How does my machine's serial number affect part selection?

The serial number is a unique identifier that tells a parts supplier the exact specifications of your machine as it left the factory. Manufacturers often make "running changes" during a model's production life, meaning a machine made in January might have different undercarriage parts than the same model made in December. The serial number eliminates this ambiguity and ensures you receive the part designed for your specific production run, avoiding costly mismatches.

Is it safe to use aftermarket undercarriage parts?

Yes, provided you choose a high-quality, reputable aftermarket supplier. Leading aftermarket manufacturers often invest heavily in research, development, and quality control, producing parts that can meet or even exceed OEM specifications in terms of material hardness and wear life. The key is to vet your supplier, check for warranties, and ensure they provide detailed technical specifications and compatibility data, as discussed in this guide.

How often should I replace my entire undercarriage system?

There is no single answer, as it depends entirely on the machine's application, the abrasiveness of the material it works in, and operator technique. Instead of a time-based schedule, replacement should be based on wear measurement. Professionals use specialized tools to measure the wear on track pins, bushings, rollers, and sprockets. As a general rule, when major components like chains and sprockets reach 75% of their wear limit, you should plan for a complete system replacement to maintain optimal performance and avoid failures.

What happens if I install an incompatible front idler?

An incompatible front idler can have severe consequences. If the mounting brackets are wrong, it simply will not fit. If it fits but has the wrong diameter or offset, it will misalign the entire track chain. This misalignment forces the chain links to grind against the sides of the track rollers and can lead to the track "jumping" off the idler or sprocket, especially during turns. This results in excessive wear on all components and a high risk of catastrophic failure and machine downtime.

Conclusion

Navigating the complexities of undercarriage maintenance demands more than just a cursory glance at a parts list; it requires a disciplined and thoughtful methodology. The financial and operational stakes, particularly in the unforgiving environments found across Africa, Australia, the Middle East, and Southeast Asia, are simply too high to permit guesswork. The five-step process articulated in this guide—verifying machine identity, mastering measurements, consulting authoritative sources, analyzing the application, and inspecting the old components—provides a robust framework for action. It transforms the act of parts selection from a gamble into a reasoned, evidence-based decision. By internalizing this approach, equipment owners and maintenance professionals can foster a deeper relationship with their machinery, one founded on mechanical empathy and a commitment to precision. This path not only prevents the immediate costs of mismatched parts but also cultivates a culture of meticulous care that enhances the longevity, reliability, and ultimate profitability of every machine in the fleet.

References

Al Marwan. (2024). 16 excavator parts you need to know. Al Marwan Heavy Equipment. https://almarwan.com/news/4183/excavator-parts-guide

Caterpillar. (2024). Undercarriage for excavators. Cat.com.

Caterpillar. (2025). Undercarriage for medium & large excavators. Cat.com.

ConEquip Parts. (2025). Excavator undercarriage part diagram. https://www.conequip.com/part-diagram-excavator-undercarriage

ConEquip Parts. (2025). Mining excavator undercarriage parts diagram. https://www.conequip.com/mining-excavator-undercarriage-parts-diagram

Know-How Equipment. (2022). Excavator components and attachments overview. https://www.know-howequipment.com/industry-news/excavator-components-and-attachments-overview.html

Truck or Track. (2025). Undercarriage parts search.