Identifying and Replacing Dogbones in Generic Over-the-Tire Track Systems

[MikePhua]

The Rise of Over-the-Tire Track Systems
Over-the-tire (OTT) track systems emerged in the early 2000s as a retrofit solution for skid steer loaders operating in muddy, sandy, or snowy terrain. These systems allow standard wheeled machines to gain the flotation and traction benefits of track loaders without permanent conversion. Manufacturers like McLaren, Loegering, and Grouser popularized OTT kits, which typically consist of steel or rubber track segments linked by tensioned connectors—commonly referred to as dogbones.
Dogbones are the mechanical links that join adjacent track pads, allowing flexion and tension while maintaining alignment. Their design varies across brands, but most use hardened steel rods with flared ends or bushings to prevent lateral movement. As OTT systems age, dogbones wear, bend, or seize, requiring replacement to maintain track integrity.
Challenges in Identifying Generic Dogbones
Operators often face difficulty identifying replacement dogbones when the original OTT system lacks branding or documentation. Common issues include:

• No visible manufacturer markings on track pads or connectors
  
• Dogbones with non-standard dimensions or thread profiles
  
• Variations in pad spacing and link geometry across models
  
• Previous repairs using improvised or mismatched components
  

Without a part number or brand reference, sourcing replacements becomes a trial-and-error process. Some dogbones resemble agricultural linkage pins or industrial clevis rods, but their metallurgy and tolerances are specific to track systems.
Inspection and Measurement Strategy
To identify suitable replacements:

• Remove a dogbone and measure overall length, shaft diameter, and end profile
  
• Check for wear patterns, especially at contact points with track pads
  
• Inspect for bushings, spacers, or retaining clips that may affect fit
  
• Compare with known OTT systems using online catalogs or dealer references
  
• Photograph the part next to a scale for visual comparison during sourcing
  

If the dogbone includes threaded ends, note the pitch and thread type (UNC, UNF, metric). Some systems use press-fit pins with retaining rings, while others rely on bolt-through designs.
Fabrication and Aftermarket Solutions
When OEM parts are unavailable, fabrication may be necessary. Options include:

• Machining new dogbones from 4140 or 1045 steel rod
  
• Heat-treating to achieve Rockwell hardness above 40C
  
• Adding grease ports or bushings to reduce wear
  
• Using shoulder bolts or clevis pins with custom spacers
  
• Welding flared ends or collars to prevent lateral drift
  

Local machine shops can replicate dogbones if provided with accurate dimensions and material specs. Some operators have successfully adapted parts from snowmobile track kits or conveyor systems.
A Story from the Yard
In 2016, a contractor in Alberta inherited a skid steer with an unbranded OTT system. The dogbones were worn and bent, causing the tracks to bind during turns. With no part numbers available, he removed a sample and brought it to a machinist, who fabricated replacements using induction-hardened steel and added grease grooves. The new dogbones lasted over 800 hours in clay and gravel conditions, outperforming the originals.
Preventive Maintenance and Installation Tips
To extend dogbone life:

• Grease pivot points monthly, especially in wet or abrasive environments
  
• Avoid sharp turns on hard surfaces that stress connectors
  
• Inspect for elongation or cracking during routine service
  
• Replace in matched pairs to maintain track symmetry
  
• Torque retaining bolts to spec and use threadlocker if applicable
  

During installation, ensure track pads are aligned and tensioned evenly. Uneven spacing can cause premature wear or binding.
Conclusion
Dogbones are the unsung heroes of over-the-tire track systems, quietly absorbing stress and maintaining pad alignment. When dealing with generic or unknown OTT kits, careful measurement and fabrication can restore function and reliability. Whether sourced from a dealer or built in a shop, the right dogbone keeps the machine moving—across mud, snow, and gravel—with confidence and control.