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    Undercarriage Sprockets & Segments – DMC Wear Parts
    Dozer undercarriage parts are critical components, often comprising over 50% of maintenance costs, that support, track, and propel the machine. Key components include track chains (links), rollers, idlers, sprockets/segments, and track shoes. Sprocket segments allow for individual replacement without breaking the track, while rollers (top/bottom) and idlers ensure smooth movement. 
    Key Undercarriage Segments & Components 
    • Track Links & Chain: Form the backbone of the track, connecting track shoes.
    • Track Shoes (Pads): Metal plates with grousers for traction.
    • Sprockets/Segments: Toothed gears driven by the final drive that engage with the track chain to move the dozer. Segments are individual, replaceable pieces, whereas sprockets are full, single-unit gears.
    • Idlers (Front & Rear): Guide the tracks and maintain proper track tension.
    • Rollers (Top & Bottom): Bottom rollers support the machine's weight, while top (carrier) rollers keep the tracks aligned.
    • Pins & Bushings: Link the tracks and allow flexibility as the track turns. 
    Wear Factors & Maintenance 
    • Inspection: Daily checks should include looking for abnormal wear, oil leaks, and debris, especially on rollers and pins.
    • Sprocket Condition: Worn-down or sharp-edged sprockets indicate a need to turn or replace pins and bushings.
    • Track Tension: Proper tension prevents premature failure and excessive wear.
    • Operations: Running the machine in reverse unnecessarily or with too-tight tracks increases wear. 
    Key Suppliers & Parts Manufacturers 
    • DMC Wear Parts: Offers a wide range of undercarriage parts.
    • FridayParts: Provides guides for understanding the track system.
    • ConEquip: Supplies components that, when worn, can cause decreased traction and uneven balance.
    • HCEParts: Manufactures heat-treated parts for enhanced durability.
    • Mytee Products: Specializes in aftermarket components. 
    Common Inspection Tips 
    • Track Sag: Measure in the center between the back and front rollers; should be around
      22
      2
       inches (
      ±0.25plus or minus 0.25
      ±0.25
       inches).
    • Wear Analysis: Check for worn-down and sharp-edged sprockets.
    • Grease Fitting: Found under a cover, it's used to adjust track tension with a grease gun. 
    • Dozer Undercarriage Parts - DMC Wear Parts
      Dozer Mounting Hardware, Rollers, Idlers, & Other Parts * Top Roller. * Carrier Rollers. * Bottom Roller. * Lower Rollers (Standar...
      DMC Wear Parts
    • Undercarriage Sprockets & Segments - DMC Wear Parts
      Sprockets Vs. Segments. Sprockets are metal gears with an inner ring that has bolt holes or a compression hub and gear ring all wi...
      DMC Wear Parts
    • What Are the Parts of a Bulldozer Undercarriage | Diagram, Pictures, and Descriptions
      Feb 17, 2022 — Some of the most important parts of a bulldozer's undercarriage include: * **Tracks** Can be metal or rubber. Metal tracks have gr...
      H&R Construction Equipment Parts
    Show all
    • Dozer Undercarriage Parts - DMC Wear Parts
      Dozer Mounting Hardware, Rollers, Idlers, & Other Parts * Top Roller. * Carrier Rollers. * Bottom Roller. * Lower Rollers (Standar...
      DMC Wear Parts
    • Undercarriage Sprockets & Segments - DMC Wear Parts
      Sprockets Vs. Segments. Sprockets are metal gears with an inner ring that has bolt holes or a compression hub and gear ring all wi...
      DMC Wear Parts
    • What Are the Parts of a Bulldozer Undercarriage | Diagram, Pictures, and Descriptions
      Feb 17, 2022 — Some of the most important parts of a bulldozer's undercarriage include: * **Tracks** Can be metal or rubber. Metal tracks have gr...
      H&R Construction Equipment Parts
    • Why Dozer Undercarriage Parts Are Critical to Your Machine's ...
      Feb 23, 2026 — Idlers at the front and rear keep everything tracking straight. The front idler guides the chain, while the rear idler helps with ...
      Kelbe Brothers Equipment
    • Cat® Undercarriage Part Guide | Gregory Poole
      Oct 9, 2024 — Cat undercarriage parts are a crucial component that supports and moves heavy machinery. Undercarriage components include: * **Bus...
      Gregory Poole Equipment Company
    • Heavy Equipment Undercarriage Parts, Rollers, Idlers, Tracks
      Undercarriage components including track chains, rollers, idlers, sprockets and track shoes support the entire operating weight of...
      ConEquip
    • Dozer Undercarriage Maintenance: The Daily Walkaround
      Dec 17, 2021 — Perform a daily walkaround checking track bolts, link assembly, bushings, sprockets, idlers, and rollers for abnormal wear and deb...
      4:21
      YouTube·Cat® Products
    • Aftermarket Undercarriage Parts for Excavators, Dozers, and Bulldozers
      Undercarriage parts for excavators are made up of small but important parts that work together to keep your machine functioning pr...
      Mytee Products
    • Dozer undercarriage wear and how to look for it
      Oct 25, 2018 — today we're going to do a full under carriage assessment on the 750K. we're going to start by walking up on the machine and doing ...
      6m
      Equipment World·EquipmentWorld
    • Bulldozer Undercarriage Parts: A Guide to the Track System
      Sep 21, 2025 — Bulldozer Undercarriage Parts: A Guide to the Track System * Tracked bulldozers can work in extreme conditions—pushing heavy loads...
      FridayParts
    • Undercarriage Parts and Components
      Sep 3, 2024 — Using state of the art technology, idlers undergo a special heat treatment that provides them with long durability and smoothness.
      www.hceparts.com
    • Dozer Undercarriage Parts – DMC Wear Parts
      Dozer Undercarriage Inspection, Maintenance, and Repairs Overlooking undercarriage maintenance is never a good idea. The dozer's c...
      DMC Wear Parts
    • Excavator Undercarriage Parts Guide
      Oct 24, 2024 — Rollers: Both bottom and carrier rollers play a pivotal role in the smooth operation of an excavator. These excavator undercarriag...
      ITR Pacific
    • Cat Dozer Track Adjuster and Recoil Spring
      Proper track tension is crucial for efficient operation, as it helps prevent excessive wear on the tracks and enhances overall sta...
      Broken Tractor
    • Essential Komatsu Mini Excavator Parts and Their Functions in 2026
      Jan 12, 2025 — Track Tensioning System The track tensioning system is vital for maintaining the correct tension in your excavator tracks. Proper ...
      YNF Machinery
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    Web results

    What Are the Parts of a Bulldozer Undercarriage


    H&R Construction Equipment Parts
    https://www.hrparts.com › blog › post › parts-bulldozer-...
    H&R Construction Equipment Parts
    https://www.hrparts.com › blog › post › parts-bulldozer-...
    Feb 17, 2022 — The sprocket on a bulldozer is a large cogwheel (either one singular part or several disparate segments) with teeth that interact with the ...Read more

    Undercarriage Parts


    Wagner Equipment Co.
    https://wagnerequipment.com › uploads › 2019/03
    Wagner Equipment Co.
    https://wagnerequipment.com › uploads › 2019/03
    PDF
    Both segments and sprockets are manufactured to accurately mate with bushings. • Tightly controlled manufacturing processes to ensure proper mounting segment ...Read more
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    YouTube · Parts ASAP
    Feb 10, 2025
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    0:41
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    What Are the Parts of a Bulldozer Undercarriage: A Short ...

    YouTube·Parts ASAP·Feb 10, 2025
    YouTube
    How to Inspect an Undercarriage on a Used Dozer
    YouTube · RDO Equipment Co.
    Mar 31, 2024
    YouTube · RDO Equipment Co.
    3:47
    Inspect pins & bushings, idlers, carrier rollers, sprocket segments, and bottom rollers to assess undercarriage life on a used dozer.
    RDO Equipment Co.
    YouTube·
    Apr 1, 2024

    How to Inspect an Undercarriage on a Used Dozer

    YouTube·RDO Equipment Co.·Apr 1, 2024
    YouTube
    In this video
    • 00:21
      Starting an inspection on a John Deere 850k dozer
    • 00:34
      Why an undercarriage that looks new may be repaired
    • 00:44
      What you can tell by inspecting pins and bushings
    • 01:04
      Undercarriage components that have been replaced
    • 01:22
      How to accurately measure undercarriage life
    • 01:48
      What to look for that could mean failure and undercarriage repair
    • 02:10
      Why is undercarriage inspection so important
    • 02:37
      Why even a partial undercarriage repair is valuable
    Dozer Undercarriage Maintenance: The Daily Walkaround
    YouTube · Cat® Products
    Dec 17, 2021
    YouTube · Cat® Products
    4:21
    Perform a daily walkaround checking track bolts, link assembly, bushings, sprockets, idlers, and rollers for abnormal wear and debris.
    Cat® Products
    YouTube·
    Dec 17, 2021

    Dozer Undercarriage Maintenance: The Daily Walkaround

    YouTube·Cat® Products·Dec 17, 2021
    YouTube
    In this video
    • 00:00
      Intro
    • 00:18
      How to Select the Right Undercarriage
    • 00:51
      Undercarriage Options
    • 01:22
      Undercarriage Maintenance
    • 01:33
      Undercarriage Walkaround
    • 02:11
      Undercarriage Sprockets
    • 02:39
      Carrier Roller
    • 03:01
      Checking Track Tension
    • 03:26
      Undercarriage Operation
    • 03:59
      Outro
    View all

    Web results

    Dozer Undercarriage Parts


    DMC Wear Parts
    https://dmcwearparts.com › undercarriage-parts › dozer
    DMC Wear Parts
    https://dmcwearparts.com › undercarriage-parts › dozer
    Complete Undercarriage Systems · Complete Track Group Assemblies · Sprockets, Idlers, & Segments · Suspension Systems · Springs Kits & Recoil Assemblies · Bogies & ...Read more

    Construction Dozer Undercarriage Components


    Berco
    https://www.berco.com › undercarriage-medium-range-...
    Berco
    https://www.berco.com › undercarriage-medium-range-...
    Our company offers a line of components and accessories for construction dozers, which includes resistant, durable and affordable undercarriage solutions.Read more

    Cat® Undercarriage Part Guide


    Gregory Poole Equipment Company
    https://www.gregorypoole.com › undercarriage-part-guide
    Gregory Poole Equipment Company
    https://www.gregorypoole.com › undercarriage-part-guide
    Oct 9, 2024 — This Cat undercarriage parts selection guide covers must-know information about undercarriage components and how to pick them for your track-type machine.Read more

    Why Dozer Undercarriage Parts Are Critical to Your ...


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    https://kelbebros.com › why-dozer-undercarriage-parts-...
    Kelbe Brothers Equipment
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    Feb 23, 2026 — Many New Holland Crawler Dozers use segmented sprockets, allowing individual worn segments to be replaced without removing the entire track ...Read more
    People also ask
    What are the components of a dozer undercarriage?
    An error has occurred. Please try again later.
    What are the parts of an undercarriage?
    An error has occurred. Please try again later.
    What are segments on a dozer?
    Segments serve the same purpose but come in multiple pieces instead of one solid sprocket ring. They are commonly used on larger crawler dozers and excavators. Benefits include: Easy replacement (single worn segments can be swapped)

    The Complete Guide to Sprockets and Segments - MST Parts Group


    MST Parts Group
    https://mstpartsgroup.com › insights › sprockets-segment...
    MST Parts Group
    https://mstpartsgroup.com › insights › sprockets-segment...
    How many hours will a dozer undercarriage last?
    4,000 hours
    Dozer undercarriage life can last up to 4,000 hours—if you put in the preventive maintenance to keep it in peak condition.

    Maintaining Your Dozer Track Pins and Bushings | Cat | Caterpillar


    cat.com
    https://www.cat.com › articles › for-owners › small-dozers
    cat.com
    https://www.cat.com › articles › for-owners › small-dozers

    Web results

    Komatsu crawler excavator and dozer undercarriage parts ...


    Xiamen Fortune Industrial Co., Ltd.
    https://www.fortunepart.com › Sprocket and Segments
    Xiamen Fortune Industrial Co., Ltd.
    https://www.fortunepart.com › Sprocket and Segments
    Komatsu undercarriage parts track sprocket segments drives the crawler, fixed on the final drive motor, and transmits the driving force of the final drive motor ...Read more

    Excavator and Bulldozer Undercarriage Parts | PDF


    Scribd
    https://www.scribd.com › document › Undercarriage-Pa...
    Scribd
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    This document provides an overview of undercarriage parts available for various CAT and other manufacturer excavator and bulldozer models.Read more
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    ITR Undercarriage Parts


    ITR America
    https://www.itramerica.com › products › undercarriage
    ITR America
    https://www.itramerica.com › products › undercarriage
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