Excavator Undercarriage


To help decide which Cat® undercarriage is the right fit for your work and your machine, ask these questions:

  • How long will I own this machine?
  • How many hours a week will I be using this machine?
  • What are my typical ground/soil conditions?
  • What are my impact conditions?
  • What attachments are on my hydraulic excavator?
  • What are the grades/slopes on my job site?

Precisely defining these parameters will help lead you to the best undercarriage choice for your needs.

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Cat Track Options Track-Type Tractor Compatibility 
Small Excavators
Medium Excavators
Large Excavators
Grease Lubricated Track (GLT)
General Duty
Positive Pin Retention 2 (PPR2)


Each track joint is sealed to retain the grease—between the pin and bushing—to minimize internal wear.

Grease Lubricated Track will:

  • Improve internal wear life by 25% or more over Sealed Track
  • Decrease undercarriage noise
  • Allow for enhanced undercarriage management opportunities

The internally greased pin and bushing with seals offers several benefits over Sealed Track.

  • Eliminates internal pin and bushing wear until the lubricant is lost.
  • Minimum 25% increase in internal wear life because of less pin and bushing wear.
  • Improves sprocket wear life because sprocket and link assembly pitch remains matched for a longer period of operation.
  • Track noise is reduced because there is no metal-to-metal contact between the pin and bushing.
  • Allows for enhanced undercarriage management opportunities.

The outer diameter of the bushing has been increased for Grease Lubricated Track and offers many benefits.

  • Increases external wear life by 20% or more.
  • Link life, normally limited by bushing wear, is better utilized because internal and external bushing wear life is extended.
  • Overall system wear life is enhanced by 25% or more due to the combined improvements of internal wear, external wear and sprocket wear.


FOR USE ON 345/349, 365/374, AND 385/390 HYDRAULIC EXCAVATORS

Resists pin walking and link cracking for reliable sealing and maximum track life. Designed for high-impact and high-travel applications such as mining, heavy construction, pipe laying, demolition, and scrap handling. Positive Pin Retention 2 (PPR2) Track is an exclusive Caterpillar offering that mechanically locks the link to the pin.

  • Resists end-play generation and link movement on the pin
  • Tightly controls seal motion for long internal pin/bushing wear life
  • Resists fatigue & crack formation with redesigned, stronger track links

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