Replacing Track Chains on the Case 550 Long Track Dozer

[MikePhua]

The Case 550 and Its Long Track Configuration
The Case 550 crawler dozer was introduced in the late 1980s as part of Case Corporation’s compact dozer lineup. Designed for grading, site prep, and light clearing, the 550 featured a hydrostatic transmission, a 4-cylinder diesel engine producing around 60 horsepower, and a robust undercarriage suited for varied terrain. The long track (LT) variant extended the track frame and added more chain links and pads, improving stability and flotation on soft ground.
Case, founded in 1842 and later merged into CNH Industrial, has produced thousands of 550-series dozers. While the standard track version is more common, the long track configuration is favored in forestry, wetland, and slope applications where ground pressure must be minimized.
Identifying the Correct Chain Length and Pitch
Owners of the 550 LT often face challenges when sourcing replacement track chains. Dealers may struggle to locate the correct part number, especially for older models not listed in modern inventory systems. However, the chain specifications can be determined by measuring:

• Sprocket pitch diameter
  
• Chain pitch (typically 6 inches for this class)
  
• Number of pads (commonly 39 for the LT variant)
  
• Bolt spacing and pad width
  

Track chains are composed of links joined by pins and bushings, with bolt-on pads attached to each link. The total length is a function of link count and pitch. For the 550 LT, the chain is longer than the standard 550, requiring additional links and pads.
Dealer Pricing and Availability Constraints
In one case, a Canadian owner received a quote of $3,800 CAD for a set of chains, excluding bolts and nuts. The price reflected limited availability—only one set remained in stock in Texas. While the cost may seem high, it aligns with current market conditions for OEM-grade chains in low-volume production.
Factors influencing price include:

• Rarity of the long track variant
  
• Supply chain disruptions
  
• Currency exchange rates
  
• Shipping and import duties
  

Aftermarket suppliers such as Trek, ITM, and ITR may offer compatible chains at lower prices, but quality and fitment should be verified. For smaller machines like the 550, extreme-duty chains are not always necessary, but proper metallurgy and bushing hardness remain critical.
Sprockets, Rollers, and Track Press Considerations
Replacing chains without addressing other undercarriage components can lead to premature wear. Ideally, new chains should be paired with:

• Fresh sprockets (already replaced in this case)
  
• Inspected or replaced bottom rollers
  
• Carrier rollers and idlers checked for wear
  
• Proper torqueing of pad bolts using a track press
  

A track press is a hydraulic tool used to disassemble and reassemble track chains, ensuring correct pin installation and pad bolt torque. Many independent shops and aftermarket dealers offer pressing services, which are recommended for safety and longevity.
Anecdote from Quebec
An operator in Val-des-Monts, Quebec acquired a 1990 Case 550 LT and began sourcing chains after discovering the dealer couldn’t locate the model in their system. After persistent inquiry, the dealer found the correct chains and quoted the final price. The owner, retired and enjoying his “sandbox,” was eager to get the machine operational and begin learning grading techniques. With a Cat 215 shovel already in use, the dozer would complement site work and expand capabilities.
Aftermarket Options and Sourcing Strategy
To locate compatible chains:

• Measure pitch and pad count directly
  
• Contact multiple dealers and independent suppliers
  
• Ask for SALT (sealed and lubricated track) options if available
  
• Compare prices across OEM and aftermarket brands
  
• Confirm availability of pressing services
  

SALT chains offer extended life by sealing lubricant inside the bushings, reducing wear and maintenance. For light-duty machines, SALT may be optional, but worth considering if long-term use is planned.
Conclusion
Replacing track chains on a Case 550 long track dozer requires persistence, accurate measurement, and strategic sourcing. While dealer systems may not always list older variants, the physical specs of the chain provide a reliable path to identification. With new sprockets already installed and rollers under inspection, the machine is well-positioned for a full undercarriage refresh. Whether sourced from OEM or aftermarket, proper installation and torqueing are essential to ensure performance and safety. For operators reviving legacy equipment, every link counts—and every hour on the machine is earned through preparation.