XCMG XE1200/ XE1250/ XE1350 Track Lower Roller Assembly (800364255): Mining -Grade Undercarriage Component by cqctrack – A Primary Manufacturer Serving the Global Mining Industry

On a large crawler excavator such as the XCMG XE1200, XE1250, or XE1350, the track lower rollers — also called bottom rollers — carry the full working weight of the machine, plus the dynamic shock loads generated during digging, swinging, and tramming over rough mine floors. The OEM part number 800364255 identifies this lower roller assembly, a component whose reliability directly influences undercarriage life, track chain wear, and machine availability.

cqctrack manufactures this lower roller assembly as a primary manufacturer of mining-grade heavy-duty crawler excavator undercarriage components, serving the global mining industry with direct factory supply. I’m Jack, from the cqctrack international affairs team, and I’ve personally written this article to take you through the manufacturing strength, metallurgical control, and full undercarriage system support that stand behind our 800364255 lower roller.

1. cqctrack: A Full-Spectrum OEM/ODM Undercarriage Manufacturer Serving 5t to 400t Equipment

cqctrack is a dedicated OEM and ODM manufacturer of heavy-duty tracked undercarriage systems. Our engineering and production capabilities stretch from 5-tonne compact machines up to 300-tonne mining-class excavators, and we have extended our undercarriage platform to 400-tonne-class ultra-heavy tracked equipment. This high-capacity engineering is directly relevant to the 120–135 tonne XCMG XE1200/XE1250/XE1350 excavators, where each lower roller must withstand immense static and dynamic loads in continuous mining duty.

Our product portfolio covers the full spectrum of tracked equipment, deepening our application knowledge:

• Crawler excavators (including the largest mining models)
• Bulldozers
• Crawler drilling rigs
• Crawler cranes
• Tracked loaders
• Tracked asphalt pavers
• Tracked conveyor systems

This breadth ensures that the 800364255 lower roller benefits from metallurgical and design insights gathered across decades of severe-duty applications — not merely a single machine type.

2. Self-Built Factory and 100% In-House Production for Consistent, Reliable Quality

A lower roller on a 135-ton mining excavator is a high-load, high-cycle component. Any inconsistency in casting density, heat treatment depth, or seal performance can cause premature roller failure, track misalignment, and costly downtime. To eliminate every external variable, cqctrack operates from a self-built industrial campus where all production lines are fully company-owned. We outsource no core manufacturing process.

Every lower roller assembly produced under part number 800364255 passes through a complete in-house chain:

• Incoming alloy steel chemistry verification via optical emission spectrometry
• Forging or casting of the roller body from high-grade alloy steel
• Precision CNC machining of the tread, shaft bore, seal cavities, and mounting faces
• Full-body through-hardening and tempering heat treatment
• 100% non-destructive flaw detection
• Dimensional metrology against XCMG engineering tolerances
• Assembly with high-performance floating seals and lifetime lubrication
• Final leak testing, anti-corrosion coating, and quality release

Because the entire production chain is under our direct control, the roller you install today is identical to the one you will install next year — stable, repeatable, and fully traceable.

3. OEM Manufacturing Partnerships and a Catalog of Over 20,000 Undercarriage Parts

Our manufacturing credentials are validated daily by the equipment brands we serve. cqctrack is an active OEM manufacturing partner for leading global manufacturers, including:

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

We produce undercarriage components that are installed directly on new machines on these assembly lines, strictly conforming to their technical drawings, material specifications, and audit requirements. Our direct OEM relationship with XCMG means the 800364255 lower roller is not reverse-engineered from a sample — it is manufactured with an inside understanding of XCMG’s load ratings, material codes, and seal standards.

For the worldwide aftermarket, our active product catalog has grown to more than 20,000 individual part numbers, covering track rollers, carrier rollers, idlers, sprockets, and complete track chains. This extensive engineering database ensures that whether you need a single lower roller for an XE1350 or a full undercarriage package for a mixed mining fleet, we can supply the correct, engineered parts without guesswork.

4. Inside the 800364255 Track Lower Roller: Alloy Steel, Full-Body Heat Treatment, and 100% NDT

Here is exactly how cqctrack builds the lower roller assembly for the XCMG XE1200/XE1250/XE1350 to deliver the structural integrity and extended service life that severe mining duty demands.

Alloy Steel Body — The roller body is produced from a high-grade alloy steel formulated for deep hardenability, high fatigue strength, and excellent wear resistance. The alloy chemistry is engineered to produce a tough core that absorbs the continuous impact loads, while the tread surface achieves deep, uniform hardness to resist abrasive wear and spalling.

Full-Body Heat Treatment — After initial machining, each roller body undergoes a complete through-hardening and tempering heat treatment. This is not a superficial case hardening; the entire roller cross-section is uniformly heat-treated, then precisely tempered to achieve the optimal balance of surface hardness for wear life and core toughness for impact resistance. This process ensures that the roller tread retains its wear-resistant properties even after significant material removal, maximizing service intervals.

100% Non-Destructive Testing (NDT) — Every single lower roller is subjected to 100% non-destructive flaw detection before it enters final assembly. Using magnetic particle and ultrasonic inspection, we scan for any sub-surface cracks, porosity, inclusions, or forging laps that could lead to roller body fracture. A failed roller can cause track chain derailment and unscheduled downtime; our NDT protocol eliminates that risk at the factory.

High-Performance Floating Seals — The roller assembly is fitted with proprietary floating seals designed to withstand extreme pressure, temperature fluctuations, and abrasive conditions. These metal-to-metal face seals retain the lifetime lubricant charge and exclude all mud, water, and fine particles, ensuring that the internal shaft and bushings operate in a clean, lubricated environment for the entire service life of the roller.

Strict Dimensional Tolerance Control — All critical dimensions — tread profile radius, shaft bore diameter, mounting bracket width, and seal cavity geometry — are machined and verified within the tolerances of the original XCMG engineering drawings. This guarantees that the 800364255 lower roller bolts directly onto the XE1200/XE1250/XE1350 track frame, maintaining correct chain alignment and uniform load distribution across all rollers.

5. One Source for the Complete Undercarriage System

A lower roller is one element of the complete crawler undercarriage. At cqctrack, we manufacture the entire undercarriage wearing package under one roof, using one unified quality system:

• Track rollers (bottom rollers / lower rollers):800364255
• Carrier rollers (top rollers):800364251
• Front idlers (guide wheels / idler assemblies):800364249
• Drive sprockets (final drive sprocket assemblies):800364253
• Complete track chain assemblies with shoes:800364256
• Bucket teeth and adapters (for excavator applications):819955342/6I8802RC/6I8802TL;819955488/6I8804

Because all these components are produced within a single integrated manufacturing environment, they share unified metallurgical standards, heat treatment philosophies, and dimensional tolerances. Sourcing your 800364255 lower rollers together with our sprockets, idlers, and track chains ensures a harmonized undercarriage system with predictable, compatible wear rates — ultimately extending the interval between major rebuilds and lowering your cost per hour.

6. Direct Supply to the Global Mining Industry — and a Personal Note from Jack

To give mining contractors, heavy equipment dealers, and international distributors fast, technically grounded support, cqctrack has built a dedicated international affairs team. The people you will work with directly are:

• Philip — managing global wholesale distribution, OEM partnership development, and aftermarket supply strategy.
• Jack — that is me. I focus on product technology, application compatibility, and technical communications. I have personally written and reviewed every specification in this article.
• Haily — coordinating inquiry handling, order processing, and international logistics to ensure on-time delivery to any mine site or warehouse.

I have personally authored this piece because I believe a lower roller on a 135-ton mining excavator deserves full technical transparency. When you contact us about the XCMG XE1200/XE1250/XE1350 track lower roller assembly (part number 800364255), you are speaking directly with a primary manufacturer — not an intermediary. We supply single units, site-level orders, and full wholesale containers, all backed by the same factory-grade quality.

If you operate XCMG large mining excavators, manage a heavy-duty crawler fleet, or are seeking a primary manufacturer of mining-grade undercarriage components serving the global mining industry, I encourage you to reach out to Philip, Haily, or me directly. Let cqctrack’s vertically integrated, self-manufactured quality keep your machines rolling productively through the most demanding mining conditions.

Jack
International Affairs Team, cqctrack