SUMITOMO KRA1665 KRA1109 SH200 CX180 CX210 CX225 CX220 CX240 excavator drive sprocket rim for SUMITOMO excavator undercarriage parts

A Definitive Technical Guide to SUMITOMO KRA1665 & KRA1109: Drive Sprocket Rim for SH200, CX Series and Mining Excavator Undercarriage

Author: Jack
Published: April 2, 2026

Introduction

In the world of heavy earthmoving, few components endure more punishment than the excavator undercarriage. At the heart of the drive system lies the sprocket rim, a precision‑engineered component responsible for converting the final drive’s torque into reliable traction. For fleet owners and maintenance specialists operating SUMITOMO SH200, SH220, CASE CX180, CX210, CX225, CX220, CX240 and related machines, understanding the exact specifications, OEM cross‑references and high‑quality aftermarket sourcing options for sprocket rims is essential for minimising downtime and controlling operating costs.

This article delivers an in‑depth technical analysis of two critical SUMITOMO part numbers – KRA1665 and KRA1109 – and explores how specialised manufacturers such as CQC TRACK provide durable, interchangeable solutions for mining and heavy construction applications.

1. Decoding the Part Numbers: KRA1109, KRA1665 and KRA10160

SUMITOMO’s undercarriage part numbering system is logical but requires careful interpretation. The two numbers referenced are directly related to the drive sprocket assembly for the popular SH200 series.

1.1 KRA1109 – Primary Drive Sprocket

The KRA1109 is the most widely recognised sprocket part number for SUMITOMO SH200 and SH220 machines (Series -2 and -3). It is a complete sprocket assembly designed to interface directly with the track chain. Key technical characteristics include:

• Tooth count: 21 teeth
• Pitch: 22H (22‑hole configuration)
• Internal diameter: 403 mm
• Bolt circle diameter: 440 mm

This sprocket is manufactured from high‑strength alloy steel and undergoes induction hardening on the tooth flanks to achieve a surface hardness of HRC 50–58 with a hardened depth of 4–10 mm, providing excellent wear resistance in abrasive soils and rock applications. The CE and EMC certifications confirm compliance with EU safety standards, an important consideration for equipment operating in regulated environments.

1.2 KRA1665 – Alternative / Heavy‑Duty Sprocket Variant

The KRA1665 is a less commonly referenced but equally important part number, often associated with the same SH200 platform. Available technical literature confirms that KRA1665 shares the same mounting interface as KRA1109 but may feature a different tooth profile, bolt pattern or material specification intended for severe‑duty cycles, such as continuous mining or rock excavation. When sourcing, it is advisable to compare both numbers against the machine’s serial number and final drive model.

1.3 KRA10160 – Cross‑Platform Sprocket Assembly

Although not explicitly listed in the original query, the part number KRA10160 frequently appears in conjunction with KRA1109. This sprocket assembly is known to be compatible with SUMITOMO SH200, SH210, SH225‑3, as well as CASE CX210, CX225, CX235, CX240, HYUNDAI R210‑3 and VOLVO EC210/EC220 series. The KRA10160 is typically described as a 21‑tooth, 22‑hole sprocket with a 403 mm internal diameter and a 440 mm bolt circle diameter, confirming that it is functionally identical to KRA1109 for most practical purposes.

Technical note: Always verify the number of mounting holes, pilot diameter and offset dimension before ordering, as early‑model SH200 machines may have slight variations.

2. Machine Compatibility Matrix

The following table provides a clear compatibility guide for KRA1109 and KRA1665 sprocket rims based on verified supplier data and OEM cross‑reference information.

Important: Always confirm undercarriage type (standard, long track or heavy‑duty) and track chain pitch before ordering. The 21T/22H configuration is the most common, but exceptions exist for certain regional variants.

3. Technical Specifications – Why Quality Matters

A sprocket rim is not a simple casting. Its performance depends on material selection, manufacturing process and heat treatment. Below are the critical engineering parameters for a high‑quality replacement sprocket.

3.1 Material and Manufacturing

Premium aftermarket sprockets such as those supplied by CQC TRACK are manufactured from high‑carbon alloy steel (e.g. 35MnB or equivalent) using a forging process, which refines the grain structure and eliminates internal voids. This is superior to cast sprockets, which are more prone to cracking under shock loading.

3.2 Heat Treatment Profile

• Tooth surface hardness: HRC 50–58
• Hardened depth: 4–10 mm (induction hardened)
• Core hardness: HRC 28–35 (maintains toughness)

This gradient hardness profile ensures that the tooth surface resists abrasive wear while the core absorbs impact loads without brittle fracture – a critical requirement in mining and rock excavation.

3.3 Dimensional Tolerances

Quality manufacturers adhere to ISO 2768‑m (medium tolerance) or tighter standards, ensuring that bolt holes, pilot diameters and tooth spacing match OEM specifications. For the KRA1109 sprocket, this typically translates to a bolt circle diameter tolerance of ±0.5 mm and a tooth profile deviation of less than 0.2 mm from nominal.

4. OEM Cross‑Reference Guide

One of the most valuable tools for procurement professionals is a reliable cross‑reference list. Below are the known equivalent part numbers for the KRA1109 sprocket:

This cross‑reference confirms that the same sprocket rim is used across multiple brands, reflecting the commonality of SUMITOMO‑derived undercarriage systems in the 20–24‑tonne excavator class.

5. CQC TRACK – A Specialised Manufacturer of SUMITOMO Sprocket Rims

CQC TRACK has established itself as a dedicated manufacturer of undercarriage components for excavators, bulldozers and mining equipment. Unlike generalist suppliers, CQC TRACK focuses exclusively on track systems – from track chains and shoes to sprockets, idlers and rollers.

5.1 SUMITOMO KRA1665 / KRA1109 Production

CQC TRACK lists the SUMITOMO KRA1665 / KRA1109 SH200 Sprocket as a core product in its catalogue. Their manufacturing process includes:

• Forging of high‑carbon alloy steel for superior grain flow
• CNC machining of all critical dimensions (bolt holes, pilot, tooth profile)
• Induction hardening of the tooth surface to HRC 52–58 with a hardened depth of 6–10 mm
• Magnetic particle inspection to detect surface cracks after heat treatment

5.2 Quality Assurance and Certification

CQC TRACK operates with ISO 9001 quality management systems, and their sprockets are manufactured to meet or exceed OEM specifications. Each batch is tested for hardness profile, chemical composition and dimensional accuracy using coordinate measuring machines (CMM).

5.3 Global Distribution

With established relationships in North America, Western Europe, Africa, South America and more than 60 countries, CQC TRACK has demonstrated its ability to supply high‑quality undercarriage parts to mining and construction fleets worldwide.

6. Sourcing and Supply Chain Considerations

For fleet owners and procurement managers, sourcing sprocket rims involves balancing cost, quality, lead time and technical support. Below are practical recommendations.

6.1 Verified Suppliers

6.2 Pricing and Availability

• New aftermarket sprockets (KRA1109) are typically priced between USD 200–350 depending on quantity and supplier.
• New OEM sprockets can be significantly more expensive (often USD 500+) and may require longer lead times.
• Used or reconditioned sprockets are available at lower cost but should be inspected carefully for tooth wear and bolt hole elongation.

6.3 Lead Times

• Stocked items: 1–5 business days (domestic)
• Direct factory orders (e.g. CQC TRACK): 2–4 weeks for manufacturing plus shipping

7. Installation and Maintenance Best Practices

To maximise sprocket life in mining and heavy excavation environments, follow these engineering practices:

1. Replace sprocket and track chain together – Installing a new sprocket on a worn chain (elongated pitch) accelerates tooth wear and can cause chain jumping.
2. Inspect bolt torque regularly – For segmented sprocket designs, re‑torque after the first 50 hours of operation. Use grade 12.9 bolts for severe applications.
3. Monitor track tension – Over‑tensioning increases sprocket tooth load; under‑tensioning allows the track to climb the sprocket.
4. Lubricate bolt threads – Apply anti‑seize compound to prevent galling and facilitate future disassembly.

8. Conclusion

For operators of SUMITOMO SH200, SH220 and CASE CX180/CX210/CX225/CX220/CX240 excavators in mining and heavy construction, the sprocket rim is a mission‑critical component. Part numbers KRA1109, KRA1665 and KRA10160 represent the core elements of this assembly, and selecting a reliable manufacturer directly impacts productivity and cost per hour.

CQC TRACK stands out as a specialised manufacturer that combines metallurgical expertise, precision machining and mining‑focused design to deliver aftermarket sprocket rims that perform reliably under the toughest conditions. By sourcing directly from a dedicated factory, fleet owners gain access to consistent quality, technical support and competitive pricing – factors that drive long‑term operational success.

Author: Jack
Specialising in heavy equipment undercarriage systems and mining machinery reliability.

Disclaimer: This article is original content created for informational and technical reference purposes. All product numbers and manufacturer names are used for identification and cross‑reference only. Always verify compatibility with your machine’s serial number and undercarriage configuration before ordering.