KOAMTSU 21M-27-11220 PC600/PC650-8 Drive Wheel Assy/Sprocket Wheel Assembly supplied by HanGong LTD-DPW Parts
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Product Specifications
Part Identification Summary
OEM Part Number:
21M-27-11220OEM Machine Model: Komatsu PC650-8 excavator.
Component Name: Drive Wheel Assembly / Sprocket Wheel Assembly
Supplier/Manufacturer: HanGong LTD (marketed under DPW Parts). This indicates it is an aftermarket replacement part.
Function of the Drive Sprocket Assembly
This is one of the most critical and highly stressed components in an excavator's undercarriage. Its primary functions are:
Propelling the Machine: The teeth of the sprocket engage with the links of the track chain. As the sprocket rotates, driven by the final drive, it pulls the track chain to move the machine forward or backward.
Transferring Power: It directly transfers the immense power and torque from the machine's final drive motor to the tracks.
Withstanding Heavy Loads: It bears the full weight of the machine and dynamic loads from digging, lifting, and traveling over rough terrain.
Key Specifications (General for PC650-8)
The Komatsu PC650-8 is a large, 70+ ton class excavator. Its drive sprockets are massive and built to withstand extreme forces.
| Specification | Description / Estimation |
|---|---|
| Number of Teeth | Typically 7 or 8 teeth for a machine of this size. |
| Pitch | Matches the track chain pitch (e.g., a common pitch for this model could be around 216mm). |
| Bolt Pattern | A multi-bolt flange that mates precisely with the final drive output hub. |
| Material & Construction | Forged or cast from high-carbon, heat-treated alloy steel for maximum strength and wear resistance. |
| Weight | This is an extremely heavy component, likely weighing several hundred kilograms. |
Compatibility
This assembly is specifically designed as a direct replacement for the following machine:
Komatsu PC650-8
Crucial Note: It is vital to confirm your machine's serial number when ordering. While the part number 21M-27-11220 is standard for the PC650-8, there can be minor revisions. Using your machine's serial number with the supplier is the best way to guarantee a correct fit.
About the Supplier: HanGong LTD (DPW Parts)
HanGong LTD is a manufacturer and global supplier of undercarriage parts for heavy machinery, often branded as DPW Parts. They specialize in producing:
Sprockets (Drive Wheels)
Track Chains (Links & Pins)
Idlers & Rollers
Track Shoes
DPW Parts are positioned in the market as a cost-effective and durable aftermarket alternative to genuine Komatsu parts. They are commonly sourced for machines where the cost of OEM parts is prohibitive, but quality is still a requirement.
Sourcing and Purchasing This Part
When procuring the HanGong (DPW Parts) 21M-27-11220 sprocket assembly:
Triple-Check Compatibility: Provide your PC650-8's serial number to the seller for confirmation. An incorrect fit is costly and time-consuming.
Understand the Source: Recognize that this is not a genuine Komatsu part but an aftermarket replacement from a known manufacturer.
Inspect Upon Delivery: Due to its weight and critical nature, inspect the sprocket for any casting defects, damage during shipping, and ensure the bolt holes and mounting surface are clean and undamaged.
Compare Wear: If replacing a worn sprocket, compare the new one with the old. The old sprocket's "hooked" teeth are a classic sign of severe wear that also damages the track chain.
Installation and Critical Maintenance Advice
Highly Technical Installation: Replacing a drive sprocket is a major repair. It involves disassembling the final drive area and requires heavy-duty tools, hydraulic presses, and significant expertise. This should only be performed by a qualified heavy equipment mechanic.
Replace in Pairs: It is strongly recommended to replace drive sprockets in pairs (both left and right sides). A new sprocket on one side and a worn one on the other will cause uneven travel and put extra stress on the undercarriage.
Systematic Replacement: Worn sprockets are often part of a "worn system." Installing a new sprocket on a severely worn track chain will cause rapid and premature failure of the new sprocket. Always inspect the entire undercarriage (track chain, rollers, idlers) and replace components as a matched set when necessary.
