Owning and Operating the Caterpillar 955K Track Loader

[MikePhua]

The Evolution and Legacy of the 955K
The Caterpillar 955K track loader was introduced during the late 1960s as part of Caterpillar’s push to modernize its crawler loader lineup. Built for versatility, the 955K combined the ruggedness of a dozer with the lifting and loading capabilities of a front-end loader. It was powered by a Caterpillar D330 diesel engine, delivering around 125 horsepower, and featured a torque converter transmission that allowed for smoother operation and better control under load.
With an operating weight of approximately 30,000 pounds and a bucket capacity ranging from 2.5 to 3 cubic yards depending on configuration, the 955K was widely used in land clearing, construction, and demolition. Caterpillar produced thousands of units before transitioning to newer models like the 963 and 973, but the 955K remains a favorite among private landowners and restoration enthusiasts due to its mechanical simplicity and robust design.
Common Wear Points and Maintenance Priorities
Owners of the 955K often report a few recurring maintenance challenges. One of the most frequent issues is brake band wear. The steering system relies on brake bands to control track movement, and over time these bands stretch, glaze, or crack. Replacing them can be a full-day job depending on access and tooling, but experienced mechanics note that the bands are relatively easy to reach once the belly pan is removed.
Other components to monitor include:

• Torque converter probe: This sensor can be difficult to access without dropping the belly pan, but careful maneuvering allows replacement without full disassembly.
  
• Gauges and wiring: Electrical systems on older machines are prone to corrosion and wire fatigue. Replacing gauges and cleaning terminals can restore reliability.
  
• Hydraulic seals: Cylinder seals and hose connections may leak due to age. Replacing them with modern equivalents improves performance and safety.
  
• Undercarriage: Track tension, roller wear, and sprocket condition should be checked regularly. A loose track can derail under load, while worn rollers increase vibration and reduce efficiency.
  

Routine lubrication is essential. Grease all pivot points, loader arms, and track adjusters. Use high-pressure grease for pins and bushings, and monitor oil levels in the transmission and final drives.
Field Use and Operator Experience
The 955K excels in clearing brush, pushing trees, and grading rough terrain. Its weight and traction allow it to operate in muddy or uneven conditions where wheeled loaders would struggle. One operator described using his 955K to clear a farm field, noting that the machine had been submerged once and still returned to service after replacing the pinion and brake bands.
Despite its age, the 955K is surprisingly easy to work on. The mechanical linkages and hydraulic systems are straightforward, and parts are still available through aftermarket suppliers and salvage yards. Operators often modify their machines with custom guards, LED lighting, and upgraded seats to improve comfort and visibility.
Tips for New Owners and Restoration Projects
For those acquiring a 955K, especially for private land use or restoration:

• Start with a full fluid change: engine oil, transmission fluid, hydraulic oil, and coolant.
  
• Inspect the brake bands and steering clutches early. These are critical for maneuverability.
  
• Replace all filters and clean the air intake system.
  
• Check the track tension and adjust according to the service manual.
  
• Test all gauges and electrical circuits. Replace corroded connectors and install a master disconnect switch.
  

If the machine has sat idle for years, expect to replace fuel lines, clean the tank, and rebuild the injectors. Cold starts may require ether or block heating depending on climate.
Caterpillar’s Influence and the 955K’s Place in History
Caterpillar Inc., founded in 1925, has been a dominant force in heavy equipment manufacturing. The 955K was part of a broader strategy to offer multipurpose machines that could handle excavation, loading, and site preparation. Its success helped pave the way for the development of hydrostatic drive loaders and electronically controlled systems in later decades.
While Caterpillar no longer produces the 955K, its legacy lives on in the thousands of units still operating worldwide. From farm fields in Georgia to demolition sites in Illinois, the 955K continues to prove that good iron never dies—it just needs grease, fuel, and a determined operator.
Conclusion
Owning a Caterpillar 955K is both a mechanical commitment and a nostalgic journey. With proper maintenance and a bit of mechanical intuition, this track loader can deliver decades of reliable service. Whether clearing land, restoring a vintage fleet, or simply enjoying the satisfaction of operating a classic machine, the 955K remains a testament to Caterpillar’s engineering and the enduring value of well-built equipment.