To select a CAT E320 undercarriage sprocket correctly, I recommend matching the sprocket to the excavator’s exact serial number, track-chain pitch, tooth count, bolt pattern, and final-drive configuration—not to the “E320” model name alone. In many E320 undercarriage configurations, buyers may encounter a sprocket with approximately 21 teeth and a track pitch near 216 mm, but these figures must be confirmed against the machine and existing components before ordering. At Zhonghai Jiuchuan, I use machine identification, dimensional inspection, and application details to reduce the risk of supplying a visually similar but incompatible part.
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This guide explains how I approach fitment, which dimensions matter, how to compare material and construction options, and what information buyers should prepare for a replacement quotation. It is intended for fleet owners, excavator repair companies, distributors, contractors, and purchasing teams sourcing CAT E320-compatible undercarriage parts.
I prepared this guide for buyers who need to replace a worn or damaged sprocket on a CAT E320 excavator or a related machine in the 20-ton class. It is especially useful when the original part number is unavailable, the machine has been rebuilt, or the excavator operates with a non-original track-chain assembly. It can also help distributors check supplier quotations before placing a bulk order.
The guide does not replace the machine manufacturer’s parts manual or a physical fitment check. Excavators with similar model names may have different production years, undercarriage arrangements, track shoe widths, final drives, or chain assemblies. For this reason, I treat the model designation as a starting point rather than the complete identification.
The sprocket is the toothed drive component that transfers torque from the final drive to the track chain. Its teeth engage with the track bushings and pull the chain around the undercarriage, allowing the excavator to travel and turn. Correct tooth geometry is essential because the sprocket must engage with the bushing diameter, pitch, and chain dimensions as a matched system.
A sprocket is not selected only by outside diameter. The important relationship includes tooth count, tooth profile, track pitch, mounting flange, bolt-hole layout, offset, and clearance around the final drive. A replacement may appear close in size but still create poor engagement, accelerated bushing wear, abnormal noise, or installation problems if one of these factors is incorrect.
Track pitch is the center-to-center distance between adjacent track-chain connection points, normally expressed in millimeters. Some E320-related configurations commonly use a pitch around 216 mm, while the actual value must be confirmed from the installed chain or technical documentation. The sprocket tooth count also affects the effective drive diameter and must correspond to the chain pitch and bushing arrangement.
In practical sourcing, I ask the buyer to provide the tooth count and a clear photograph of the worn sprocket beside a ruler or caliper. A commonly encountered configuration may have 21 teeth, but I do not treat that number as universal for every E320 machine. Rebuilt undercarriages and replacement chains can change the correct sprocket specification.
The sprocket must attach correctly to the final-drive hub. I check the number of mounting holes, hole diameter, bolt-circle diameter, flange thickness, center bore, and the sprocket’s offset from the mounting face. For example, a six-bolt mounting pattern may be used in some configurations, but the bolt-circle measurement and hole dimensions still need to be verified before production.
I also recommend checking the relationship between the sprocket and the track frame. The sprocket should have enough clearance from the frame, rollers, guards, and track chain, while its centerline should align with the chain. Incorrect offset can cause side loading even when the bolt pattern appears to match.
When inspecting the old sprocket, I look for hooked or pointed teeth, uneven tooth wear, cracks, chipped sections, and polished areas caused by abnormal contact. Tooth wear should be assessed together with the track bushings and chain links because replacing only one heavily worn component may provide limited service value. I also inspect the idler, rollers, and track tension condition before finalizing the replacement specification.
For dimensional checking, I suggest recording at least 3 measurements for critical features such as tooth spacing or mounting dimensions and comparing the readings for consistency. If measurements vary significantly, the old part may be damaged or the measuring method may be inaccurate. Photographs, a parts manual page, and the machine serial number provide useful supporting evidence.
A one-piece sprocket is installed as a complete ring or wheel and is commonly selected when the final-drive design allows straightforward removal. A segmented sprocket uses separate segments, which can simplify replacement in some undercarriage layouts. I recommend choosing the format that matches the existing final-drive hub rather than selecting based only on perceived installation convenience.
Segment design can be useful for maintenance planning because a damaged section may be replaced without changing the complete ring, depending on the machine and segment arrangement. However, segment interfaces, bolt seating, and alignment require careful inspection. The supplier should confirm whether the requested part is a complete sprocket, a segment set, or a sprocket ring before quoting.
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Undercarriage sprockets are generally produced from wear-resistant steel and may receive controlled heat treatment to improve tooth durability. The exact steel grade, hardness range, and treatment process should be confirmed in the supplier’s technical documentation rather than assumed from appearance. I evaluate these details together with casting or forging quality, machining accuracy, and inspection procedures.
Hardness alone does not prove that a sprocket is suitable. If the tooth surface is too soft, wear may accelerate; if the material or treatment is poorly controlled, brittleness or cracking may become a concern. A responsible supplier should explain the material standard and inspection approach without presenting unsupported life guarantees.
| Check Item | What I Confirm | Why It Matters |
|---|---|---|
| Machine identity | Model, serial number, production information | Separates similar but incompatible configurations |
| Chain interface | Pitch, bushing arrangement, tooth count | Ensures correct tooth engagement |
| Mounting interface | Hole count, hole diameter, bolt circle, offset | Confirms final-drive installation |
| Physical condition | Tooth wear, cracks, deformation, corrosion | Identifies whether related parts also need attention |
I first collect the excavator model, serial number, operating region, final-drive details, and current track-chain information. I also ask whether the machine is using an original undercarriage, a replacement chain, or a mixed set of components. This information helps prevent a quotation based on an incomplete model description.
The buyer should record the tooth count, mounting-hole count, approximate dimensions, and any casting or stamped identification. Clear images of both sides of the sprocket are valuable, particularly photographs showing the flange, teeth, center bore, and mounting holes. If the sprocket is severely damaged, I can compare it with the track chain and final-drive hub instead of relying on the damaged profile alone.
Application affects the most suitable specification. Quarry work, demolition, heavy clay, abrasive soil, and general earthmoving can expose the undercarriage to different loading and contamination conditions. I ask about average operating hours, ground conditions, track shoe width, cleaning practices, and whether the machine works on slopes or in high-impact areas.
A useful quotation should identify the proposed part, fitment basis, material information, production method, packing, quantity, and lead-time estimate. I recommend asking whether the quoted price covers one complete sprocket, one segment, or a matched set. For international orders, the buyer should also confirm net weight, packing dimensions, shipping terms, and replacement procedures for verified manufacturing discrepancies.
The most common mistake is ordering from a keyword such as “E320 sprocket” without checking the serial number or mounting interface. Another mistake is matching tooth count while ignoring chain pitch, bushing condition, or sprocket offset. Buyers sometimes compare only the unit price and overlook machining accuracy, packaging protection, and the supplier’s ability to provide dimensional confirmation.
I also advise against installing a new sprocket on a chain with severely worn bushings without a broader undercarriage assessment. The new tooth profile may not engage properly with an excessively worn chain. In addition, incorrect track tension can affect wear and performance, so installation should follow the excavator’s maintenance procedure.
Sprocket pricing depends on the construction type, material, machining requirements, quantity, packaging, and destination. A single replacement order may have different commercial conditions from a distributor order, while custom or low-volume production may require additional confirmation before manufacturing. I do not recommend using a low price as proof of equivalent quality.
Before placing an order, ask the supplier about minimum order quantity, sample or trial availability, production lead time, inspection documents, and spare-parts support. Lead time should be quoted according to the confirmed specification and current production schedule, not presented as a guaranteed period before the part is technically identified. This approach makes purchasing expectations clearer for both sides.
At Zhonghai Jiuchuan, I support buyers by reviewing machine information, photographs, measurements, and existing undercarriage details before confirming a CAT E320-compatible sprocket. Our service focus is not only supplying a component, but also helping the buyer establish a traceable fitment basis. When the information is incomplete, I clearly identify which dimensions still require confirmation.
We can discuss one-piece or segmented options where applicable, material and heat-treatment requirements, packaging needs, and export-order considerations. For distributors and repair companies, I can also help organize repeat specifications so future purchases are based on the same confirmed configuration. Final production remains subject to technical verification and the agreed quotation.
The correct CAT E320 undercarriage sprocket is the one that matches the machine’s complete drive and track-chain system, not simply the one labeled for an E320 excavator. I recommend starting with the serial number, tooth count, track pitch, mounting pattern, and photographs of the existing part. Then compare the supplier’s proposed dimensions and material information before approving production.
To request a Zhonghai Jiuchuan quotation, prepare the excavator model and serial number, sprocket photographs, tooth count, mounting measurements, quantity, destination, and application conditions. I can then review the information, identify any missing fitment details, and provide a practical supply recommendation for your CAT E320 undercarriage requirement.
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