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Komatsu D39PX-22 Undercarriage Overview
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General Information
The Komatsu D39PX-22 is a mid-sized crawler dozer designed for durability and efficient operation in demanding environments. The undercarriage plays a critical role in its stability, traction, and longevity, featuring robust components engineered for long service life and reduced maintenance.
Undercarriage Components
  • Track Shoes: The D39PX-22 comes with single grouser track shoes measuring 635 mm (25 inches) wide, providing excellent ground contact and flotation in soft or muddy terrain.
  • Number of Shoes: Each side has 39 shoes, offering optimal distribution of machine weight.
  • Track Rollers: Equipped with 6 heavy-duty, sealed and lubricated track rollers per side, reducing friction and wear.
  • Idlers: The dozer features idler cushions designed to absorb shocks, extending undercarriage and track life.
  • Sprockets: Solid, bolt-on sprockets with wider teeth improve power transmission and help reduce accelerated wear.
  • Track Guards: End-section track roller guards protect rollers from debris and damage.
  • Sealed and Lubricated Links: Track links incorporate sealed and lubricated bushing assemblies to minimize corrosion and extend service intervals.
Design Features
  • Large Link and Bushing Diameter: These components contribute significantly to extending the life of the undercarriage by reducing pin and bushing wear.
  • Wider Sprocket Teeth: Enhance engagement with the track to reduce slippage and wear.
  • Protected Travel Motors and Final Drives: Integrated into the track system to reduce vulnerability to damage during operations.
  • Rigid Track Frame: Offers structural strength and stability for precise maneuvering and pushing power.
Performance and Durability
  • The wide track shoes and sealed components offer excellent flotation and reliability, even in challenging, uneven terrain.
  • The undercarriage’s robust design results in lower maintenance costs, with Komatsu claiming up to 40% longer wear life compared to previous models.
  • Protective features such as sprocket inner guards and crankcase underguards shield critical components from debris and damage.
Hydraulic and Control Features
  • The machine uses an electronically controlled Hydrostatic Transmission (HST) with quick-shift and variable speed settings, enabling smooth travel and precise control.
  • Palm Command Control System (PCCS) provides proportional hydraulic control, enabling responsive movement of the blade and dozer attachment simultaneous to travel.
Maintenance and Service
  • The sealed and lubricated track link assemblies reduce lubrication points, extending service intervals.
  • Grease gun holders and easy access points facilitate routine lubrication.
  • Track rollers and sprockets are designed for easier replacement, minimizing downtime during undercarriage maintenance.
Operator Environment
  • The D39PX-22 features an operator-friendly cab or canopy with excellent visibility, comfortable seats, and ergonomic controls.
  • Onboard diagnostics and electronic monitor panels assist operators and technicians in monitoring machine health, including undercarriage wear status.
Terminology
  • Single Grouser Shoes: Track shoes with one protruding ridge for traction on hard or mixed terrain.
  • Idler Cushions: Shock-absorbing components that protect the track system.
  • Sealed and Lubricated Tracks: Track bushes and pins sealed to retain lubrication and exclude dirt.
  • Sprocket: A toothed wheel engaging with the track chain to propel the dozer.
  • Hydrostatic Transmission (HST): Electrically controlled hydraulic transmission providing smooth speed and direction changes.
Conclusion
The Komatsu D39PX-22 undercarriage exemplifies advanced engineering focused on durability, efficiency, and ease of maintenance. Its wide track shoes, sealed components, and heavy-duty rollers deliver superior ground contact and wear resistance. Combined with Komatsu’s electronic hydraulic and transmission controls, the D39PX-22 offers reliable, stable performance with reduced downtime, optimized for challenging jobsite conditions.
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