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    • CAT 303-5ECR Front Idler | Part #2674829
    • CAT 303-5ECR Front Idler | Part #2674829 - close up
    • CAT 303-5ECR Front Idler | Part #2674829 - left side
    • CAT 303-5ECR Front Idler | Part #2674829 - internal guide lugs

    CAT 303-5ECR Front Idler | Part #2674829

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    CAT 303-5ECR Front Idler | Part #2674829This replacement front idler is cataloged for CAT 303-5ECR and is intended for service in the tracked undercarriage. The front idler supports track routing,...
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    PRODUCT SPECIFICATIONS

    Technical Dimensions

    Part # 2674829
    Weight 68.2 lbs

    Construction & Features

    DurabilityHeavy duty only
    FitmentOEM-reference match
    ConstructionDrop forged steel
    FinishHeat-treated hardening

    Frequently Asked Questions

    Fitment, availability, fulfillment, and support for this product

    What front idler fits the Cat 303-5ECR?
    This front idler is listed for the Cat 303-5ECR and matches OEM Part #2674829. Before ordering, compare your machine make, model, serial number, and existing part number to confirm the correct undercarriage position and fitment.
    What sprocket fits the Cat 303-5ECR?
    Matching drive sprocket options for the Cat 303-5ECR include CAT 303.5ECR Sprocket | Part #264-5371. When installing new rubber tracks, inspect sprockets for hooked, sharp, or uneven teeth because worn sprockets can shorten track life and damage the drive lugs.
    What bottom rollers fit the Cat 303-5ECR?
    Matching bottom roller or track roller options for the Cat 303-5ECR include CAT 303.5ECR Track Roller | Part #266-8793. Replacing worn rollers before installing new rubber tracks helps keep the undercarriage aligned and reduces uneven wear across the track carcass.
    What top roller fits the Cat 303-5ECR?
    Matching top roller options for the Cat 303-5ECR include CAT 303.5ECR Carrier Roller | Part #266-8794. Top rollers support the upper track path and should be checked for bearing play, flat spots, and uneven wear during undercarriage service.
    What rubber tracks pair with this front idlers?
    Matching rubber track options connected to this Cat 303-5ECR undercarriage setup include CAT 303.5ECR Rubber Tracks | 300x52.5Wx90 (Part #300X52.5WX90). If you are replacing this part, inspect the full undercarriage so the new component and rubber tracks wear evenly together.
    Should I inspect the full undercarriage before replacing this Cat 303-5ECR part?
    Yes. Sprockets, idlers, rollers, and rubber tracks wear together as a system. Before replacing this part for the Cat 303-5ECR, inspect the full undercarriage for uneven wear, bearing play, hooked sprocket teeth, and track tension issues.
    How do I confirm this product fits the Cat 303-5ECR?
    Confirm fitment by checking your machine make, model, serial number, and existing track size or OEM part number. For rubber tracks, verify width, pitch, and link count. For undercarriage parts, compare the part number, bolt pattern, tooth count, and machine position. You can also use the TrackTECH Track Finder or call (850) 816-7898 before ordering.
    How fast does TrackTECH ship Cat 303-5ECR parts?
    TrackTECH ships rubber tracks and undercarriage parts quickly across the Lower 48. Heavy items typically ship by freight, while smaller undercarriage parts may ship by parcel depending on warehouse availability. Review TrackTECH shipping information or contact us before ordering if you need priority freight options.