XCMG Drilling Rig XR280 800352037/ Track Bottom Roller Assy/ Lower Roller Assembly/ Manufacturer of heavy- duty tracked undercarriage parts; supports OEM and ODM customization.

On a crawler drilling rig like the XCMG XR280, the machine’s entire weight — often exceeding 80 tonnes with tooling — rests on a set of track rollers that must roll smoothly under relentless pressure, impact, and abrasive slurry. The bottom roller assembly, also referred to as the lower roller or track roller, carries the vertical load, guides the track chain, and resists lateral forces as the rig slews and trammes across uneven pile mats. The OEM part number for this vital component is 800352037, and at cqctrack, we manufacture it as a direct-replacement, heavy-duty assembly engineered specifically for the demands of rotary drilling applications.

I’m Jack, from the cqctrack international affairs team, and I’ve personally written this article to give you a detailed look at how we build the XR280 bottom roller, the manufacturing infrastructure behind it, and the complete undercarriage support we offer to drilling contractors and equipment owners worldwide.

1. cqctrack: A Specialized OEM/ODM Undercarriage Manufacturer from 5t to 400t Machines

cqctrack is not a general trading company. We are a focused OEM and ODM manufacturer of tracked undercarriage assemblies and components. Our engineering and production capabilities range from 5-tonne mini excavators up to 300-tonne mining-class machines, and we have already extended our proven manufacturing platform to 400-tonne-class ultra-heavy tracked equipment. This extreme load capacity is highly relevant to a drilling rig roller: the XR280’s rollers must survive crushing static loads combined with dynamic shock when the rig moves from borehole to borehole.

Our undercarriage components serve a wide range of tracked machinery, and this diversity deepens our engineering database:

• Crawler drilling rigs (XCMG XR series and others)
• Crawler cranes
• Excavators
• Bulldozers
• Tracked loaders
• Tracked asphalt pavers
• Tracked conveyor systems

As an ODM-capable manufacturer, we actively support customization. If your XR280 operates in particularly aggressive ground — for instance, sharp blasted rock that accelerates roller tread wear — we can engineer alternative materials, hardness specifications, or sealing configurations to meet your specific site requirements.

2. Self-Built Factory and Fully In-House Production for Uncompromised Consistency

Track rollers are high-cycle components. A tiny variation in heat treatment, bore geometry, or seal groove finish can lead to early oil leakage, seizure, or uneven tread wear. To eliminate these risks at the source, cqctrack operates from a self-built industrial campus where every production line is company-owned and operated. We outsource none of the core processes.

Every bottom roller assembly marked with part number 800352037 progresses through a completely in-house sequence:

• Raw material spectrographic verification
• Alloy steel forging or casting of the roller body
• CNC machining of the tread, bore, seal cavities, and mounting surfaces
• Full-body heat treatment and tempering
• 100% non-destructive flaw detection
• Dimensional inspection on calibrated CMM and gauging stations
• Assembly with proprietary floating seals and lifetime lubrication
• Final leak testing and coating

Because all manufacturing data resides under our own roof, the quality you get from one production batch is identical to the next — fully traceable, fully repeatable. This self-contained system is what guarantees stable and reliable product performance over thousands of operating hours.

3. OEM Supply Partnerships and a 20,000+ Reference Undercarriage Catalog

Our manufacturing standards are proven daily on the assembly lines of global equipment brands. cqctrack serves as an OEM manufacturing partner for leading manufacturers, including:

• XCMG
• Hitachi
• LiuGong
• KOBELCO
• SDLG (LGCE)

We produce undercarriage parts that are installed on brand-new machines, conforming strictly to each OEM’s technical drawings, material specifications, and quality audit requirements. This direct experience manufacturing for XCMG means the 800352037 bottom roller is not an approximated copy — it is produced with an intrinsic understanding of XCMG’s load ratings, seal standards, and dimensional envelope.

For the aftermarket, we manufacture replacement undercarriage parts for an extensive range of Chinese domestic and global equipment brands. Our active product catalog has grown to more than 20,000 individual part numbers, encompassing bottom rollers, top rollers, front idlers, drive sprockets, and complete track chains. This breadth means we can support mixed fleets and supply hard-to-find undercarriage parts for older or less common drilling rig models with equal reliability.

4. The 800352037 Bottom Roller: Alloy Steel, Full Heat Treatment, and 100% NDT

Let me detail exactly how we manufacture the XR280 bottom roller assembly to withstand the punishing environment of deep foundation drilling.

Alloy Steel Forging/Casting — The roller body is produced from a high-grade alloy steel formulated for deep hardenability, high fatigue strength, and excellent wear resistance. The chemistry is designed to produce a tough core that can absorb repeated impact, while the tread surface hardens deeply to resist abrasive wear and spalling.

Full-Body Heat Treatment and Tempering — After initial machining, each roller body undergoes complete through-hardening heat treatment. This is not a superficial flame or induction hardening that leaves a thin, brittle case. The entire roller cross-section is uniformly treated, then precisely tempered to the target hardness range. The result is a roller tread that stays hard through a significant depth of wear, combined with a tough, crack-resistant core structure.

100% Non-Destructive Testing (NDT) — Every single bottom roller is subjected to non-destructive testing before it enters final assembly. We use magnetic particle and ultrasonic inspection methods to detect any sub-surface cracks, porosity, inclusions, or forging laps that could lead to roller body fracture. In a drilling rig, a failed roller can cause track detachment and days of lost production; our NDT protocol eliminates that risk at the factory.

Strict Dimensional Tolerance Control — All critical dimensions — tread profile radius, shaft bore diameter, mounting bracket width, and seal groove geometry — are machined and verified within the original engineering drawing tolerances. This ensures the 800352037 roller assembly fits directly onto the XR280 track frame without modification, maintains correct track chain alignment, and allows the floating seal to function flawlessly to exclude mud, water, and abrasive particles.

5. Complete Undercarriage System Capability: One Source, One Quality Standard

A bottom roller works as part of an interconnected undercarriage system. At cqctrack, we manufacture the entire package under the same rigorous quality roof:

• Track rollers (bottom rollers)800352037
• Carrier rollers (top rollers)800352037
• Front idlers (guide wheels)800352123
• Drive sprockets (drive wheel assemblies)800352096
• Complete track chains with shoes (full track assemblies)800352043

Because all these components share a unified material specification system, heat treatment philosophy, and machining tolerance regime, they wear compatibly as a set. For an XCMG XR280 that is constantly repositioning on construction sites, this systemic compatibility directly extends undercarriage service intervals and lowers the total cost per meter drilled.

6. Your Direct International Contacts — and a Personal Message from Jack

To give drilling contractors, fleet managers, and parts distributors a direct line to expert support, cqctrack has established a dedicated international affairs team. The people you will communicate with are:

• Philip — responsible for global distribution strategy, OEM partnerships, and aftermarket channel development.
• Jack — that is me. I focus on product technology, application compatibility, and technical communication. Every specification in this article has been personally reviewed by me against our engineering data.
• Haily — managing inquiry handling, order coordination, and international logistics to ensure your parts are delivered where and when you need them.

I have authored this piece because I believe a bottom roller for a heavy drilling rig deserves the same depth of technical explanation as the rig itself. When you contact us regarding the XCMG XR280 track bottom roller assembly (part number 800352037) or any other undercarriage component, you are talking directly to people who understand the alloy, the heat treat cycle, and the test reports behind the product.

If you operate XCMG drilling rigs, manage a piling fleet, or are searching for an undercarriage manufacturing partner that offers true OEM/ODM capability and supports customization for heavy-duty tracked equipment, I invite you to reach out to Philip, Haily, or me directly. Let cqctrack’s vertically integrated, self-manufactured quality keep your rollers rolling and your rigs productive.

Jack
International Affairs Team, cqctrack