321 Excavator

CAT 321 Excavator Undercarriage Parts

We deliver undercarriage replacement parts and complete undercarriages for the Caterpillar 321 series hydraulic excavator. All of our undercarriage parts come backed by a 3 year, 4 thousand hour warranty. In addition to undercarriage parts, we also supply used, remanufactured & aftermarket components for the Cat 321 excavator, some of which qualify for same-day shipping. Contact us today with your equipment needs.

The Cat 321 Series Includes

321C, 321D, 321DL & 321DLN

Caterpillar 321 Excavator

Cat 321 Series excavators are designed to handle the most rugged operating conditions, while providing long life and value.  With a robust undercarriage acting as a solid foundation built tough to absorb the stresses of everyday work, the Cat 321 series can take on any project, large or small. Rollers and idlers are sealed and lubricated to extend service life, and track links are assembled and sealed with grease to decrease internal bushing wear and increase life by as much as 25%, when compared to dry seal undercarriages. The spring recoil system stroke has been increased to better relieve excess track tension, which can occur when material builds up between the track and sprocket. By using quality replacement parts when maintaining your Cat 321, you will insure it’s dominance as an earthmover when compared to the competition.  Order your 321 series undercarriage parts from us today.

    Cat Undercarriage Request

    Track AssemblyTrack PadsRollersSprocketsIdlersComplete Undercarriage




    CAT 321 Undercarriage

    excavator sprockets

    Cat 321 Sprockets

    Our sprockets and segment groups are specifically designed to provide extended life and durability for the toughest working conditions. We offer sprockets for crawlers, dozers and excavators.

    undercarriage rollers

    Cat 321 Rollers

    PIVOT supplies the construction and mining industry with top carrier rollers along with single and double flange bottom track rollers. Our rollers are manufactured to provide excellent service in extreme operating conditions.

    undercarriage idlers

    Cat 321 Idlers

    We also carry a wide range of idlers that are fabricated and cast from high strength steel. This is to maintain the integrity of our product and reliability for your machine.

    excavator undercarriage

    Cat 321 Track Assembly

    PIVOT offers track group assemblies as well as individual track chains. Our track chains come either greased or sealed and lubricated in Standard or Heavy Duty options. All track groups can be assembled prior to shipment for your convenience and ease of install.

    undercarriage track pads

    Cat 321 Track Pads

    We supply a variety of arrangements when it comes to your machine’s track shoes that have been designed and tested for your specific application. All of our track pads come either with a single, double or triple grouser setup. You also have the option of with or without mud-holes, standard or extreme service, along with various widths.

    track adjuster

    Cat 321 Track Adjusters

    PIVOT also carries several options for complete track adjuster assemblies, springs and seal kits. Our track adjusters are direct replacement for fit, form and function and have been specifically engineered to operate under extreme working conditions to keep you moving.