CAT 303.5ECR Rubber Tracks — OEM grade replacement tracks engineered for contractor-grade performance.
Direct OEM grade replacement for the CAT 303.5ECR. Track size: 300x52.5Wx90. Tread pattern: Directional.
Tread Pattern Guide
Compare common TrackTECH rubber track tread patterns by traction, ride comfort, surface protection, and jobsite conditions.
Balanced Jobsite Performance
Best for: general construction, dirt, gravel, clay, and mixed jobsite use.
C-Block tracks are a strong all-around option for compact track loaders working across everyday jobsite conditions. They provide dependable traction, a stable ride, and balanced wear life without being overly aggressive on the ground.
Aggressive Traction
Best for: mud, loose soil, slopes, clay, and soft ground.
Zig-Zag tracks use an alternating lug design to improve bite and help the track clean out in loose or wet conditions. This pattern is a strong choice when traction and hillside control matter more than surface protection.
Severe-Duty Terrain
Best for: rough terrain, demolition, forestry, heavy dirt work, and severe-duty jobsites.
X-Terrain tracks are built for harsh jobsite conditions where maximum bite and durability are the priority. This pattern is ideal for demanding work where traction, stability, and rugged performance matter most.
Mini Excavator Control
Best for: mini excavators, trenching, grading, utility work, and mixed surfaces.
Directional tracks are commonly used on mini excavators where forward traction, controlled movement, and dependable wear are important. This pattern helps provide predictable movement across dirt, gravel, clay, and general excavation conditions.
Not sure which tread pattern is right for your machine? Send your make, model, serial number, or a photo of your current track size and TrackTECH will help confirm fitment before your order ships.
Common questions about CAT 303.5ECR rubber tracks
The Cat 303-5ECR uses 300x52.5wx90 rubber tracks (Width: 300mm, Pitch: 52.5mm, Links: 90). Always verify the size stamped on your existing track or use the TrackTECH Rubber Track Finder before ordering.
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.
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.
Matching front idler options for the Cat 303-5ECR include CAT 303.5ECR Front Idler | Part #2674829. Front idlers guide the track and help maintain proper tension, so inspect the flange, bearing condition, and wear surface before installing new tracks.
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.
The 300x52.5wx90 rubber track size is used across multiple compact machines, including 300x52.5Wx90, Cat 303-5-ECR, Cat 303-5CCR, Cat 303CCR, Cat 303-5DCR, Cat 304ECR, IHI 35UJ, and IHI 38UJ. Always confirm by checking the size stamped on your current track and your machine serial number before ordering.
Yes, inspect sprockets, rollers, and idlers before installing new rubber tracks on the Cat 303-5ECR. Worn undercarriage parts can shorten track life, cause poor alignment, and create uneven wear. Shop matching parts from the linked products above or view all undercarriage parts.
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.
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