Finding the Right Track Chain for the Sumitomo S160 Excavator

[MikePhua]

Sumitomo’s Compact Excavator Legacy
Sumitomo Construction Machinery, a division of Sumitomo Heavy Industries, has been producing hydraulic excavators since the 1960s. Known for their precision engineering and robust undercarriage systems, Sumitomo machines are widely used across Asia, Europe, and North America. The S160 model, part of their mid-size excavator lineup, was designed for versatility in urban construction, utility trenching, and light demolition. With an operating weight around 16 metric tons and a digging depth exceeding 5.5 meters, the S160 balances power and maneuverability.
Although production of the S160 has ceased, many units remain in active service. One of the most critical components for maintaining performance is the track chain—a part of the undercarriage that directly affects traction, stability, and wear resistance.
Terminology Notes

• Track Chain: The linked assembly of steel components that forms the continuous track loop, engaging with sprockets and rollers.
  
• Pitch: The distance between the centers of adjacent track pins, crucial for compatibility.
  
• Bushing: A cylindrical sleeve between the pin and link that reduces friction and wear.
  
• Master Link: A removable link that allows the track chain to be opened for installation or repair.
  

Challenges in Sourcing a Compatible Track Chain
Finding a fitting track chain for the S160 can be difficult due to:

• Discontinued OEM part numbers
  
• Regional differences in undercarriage configurations
  
• Lack of cross-reference data between Sumitomo and aftermarket suppliers
  
• Variations in pitch and link height across production years
  

A contractor in Malaysia spent weeks searching for a replacement chain, only to discover that his machine had a modified undercarriage from a previous rebuild. Measuring the pitch and link dimensions manually helped him identify a compatible aftermarket option.
Measurement and Identification Strategy
To ensure proper fitment:

• Measure the pitch using calipers across multiple links
  
• Count the number of links per side to confirm total chain length
  
• Check bushing diameter and link height
  
• Inspect sprocket tooth profile for wear and compatibility
  
• Compare measurements with known standards from Komatsu, Hitachi, or Kobelco if cross-matching
  

Recommended pitch for the S160 typically falls around 171 mm, but variations exist. Always verify before ordering.
Aftermarket Options and Compatibility
Several aftermarket manufacturers offer track chains that may fit the S160:

• Berco
  
• ITM
  
• VemaTrack
  
• ITR
  
• Trackline
  

When selecting a supplier:

• Confirm warranty terms and wear life expectations
  
• Request dimensional drawings or sample links
  
• Ask about heat treatment and hardness ratings (target: 50–55 HRC for bushings)
  
• Ensure master link compatibility with your installation tools
  

A fleet manager in South Korea switched to Berco chains and reported a 20% increase in service life compared to his previous supplier, thanks to deeper induction hardening.
Installation Tips and Preventive Maintenance
Proper installation ensures longevity:

• Use a hydraulic press or track tensioner to close the master link
  
• Torque bolts to spec and use thread locker if applicable
  
• Adjust track tension to manufacturer guidelines—too tight accelerates wear, too loose risks derailment
  
• Grease idlers and rollers before operation
  

Maintenance recommendations:

• Inspect chain wear every 250 hours
  
• Measure bushing wear and link stretch annually
  
• Rotate chains if reversible to balance wear
  
• Replace sprockets and rollers in pairs to prevent uneven engagement
  

A municipal crew in Thailand extended their S160’s undercarriage life by 30% after implementing a monthly inspection checklist and switching to biodegradable track lubricants.
Anecdote from the Field
In 2023, a small excavation firm in New Zealand faced repeated derailments on their aging S160. After replacing the track chain with a mismatched aftermarket unit, the problem worsened. A technician discovered the pitch was off by 3 mm, causing the sprocket to ride improperly. After sourcing a correctly pitched chain and replacing the sprockets, the machine returned to full reliability. The owner later documented the specs and laminated them for future reference.
Conclusion
Finding a fitting track chain for the Sumitomo S160 requires precision, patience, and a clear understanding of undercarriage geometry. With careful measurement and supplier vetting, operators can restore full mobility and extend the life of their machine. The S160 may be aging, but with the right track beneath it, it still has plenty of ground to cover.