• CAT 303.5ECR 
  • CAT 303.5ECR 
  • CAT 303.5ECR 
  • CAT 303.5ECR 

CAT 303.5ECR Mini Ex Tracks

CAT 303.5ECR Mini Ex Tracks

$899.00
$899.00 $939.00
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Heavy Duty Savings – Limited Time Only

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Warranty Certificate
Installation Guide
Claim Guide

Specifications

Track Size: 300×52.5W×90
Condition: Brand New
Design: Heavy Duty
Width: 300 mm
Pitch: 52.5W
Links: 90
Weight: 328 lbs

Compatibility

Caterpillar 303.5E CR, 303.5E2 CR, 303.5C CR, 303.5D CR, 303 CR, IHI 35 NX, 35 UJ, 38 UJ, 40Z, IMER/Sumitomo 35–40 series

18-Month Warranty

All rubber tracks are backed by a 18-month warranty, ensuring full replacement coverage for any manufacturing defects during the warranty period. This warranty reflects our commitment to providing reliable products design to meet or exceed OEM standards.
CAT 303.5ECR Mini Ex Tracks

$899.00

Engineered to Outlast

Heavy-duty by design, delivering superior durability and performance.
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Proven

Premium Rubber Compounds

Crafted with a proprietary blend of virgin rubber, carbon black, and high-performance additives, our rubber tracks are designed to resist cracking, chunking, and tearing. This advanced compound ensures a strong bond between the rubber and internal steel components, extending track life and improving resistance to abrasive conditions. Built to perform in extreme temperatures and tough terrains.

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Track

Full Steel Cord Reinforcement

Each track is reinforced with continuous steel cords that run the entire length of the track, delivering unmatched tensile strength and preventing stretch or separation under heavy load. This design ensures a stable, consistent footprint—ideal for high-torque machines like skid steers and mini excavators. The result? Longer-lasting tracks with minimal downtime.

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Drop Forged Steel Links

To maximize durability, our tracks are embedded with drop-forged steel links at every guide point. These precision-forged inserts enhance load-bearing strength, reduce internal wear, and maintain consistent alignment with the undercarriage. Designed to handle aggressive terrain and heavy impact, these inserts keep your equipment running smoother, longer.

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Why choose TrackTECH?

  • Heavy Duty Only: We only carry heavy-duty tracks with continuous steel cord technology.
  • Easy OEM Fitment: Find the exact track you need by make & model in seconds - not days.
  • Faster Nationwide Shipments: Delivered to your jobsite, business, farm or freight terminal - faster than ever.
  • Interactive Field Map: Track priority terminal pickup points, nearby rentals, and certified mechanics in real time.
  • Dedicated Technical Support: Responsive service and transparent communication you can trust.

Why don’t you offer standard-duty tracks?

TrackTECH is heavy-duty only. Standard-duty tracks are cheaper upfront, but they wear out faster, cost more per hour of use, and increase downtime. By focusing only on premium heavy-duty tracks, we ensure every contractor gets OEM precision fitment, superior durability, and the best long-term value.

What warranty do your tracks include?

We guarantee the quality of our tracks with an 18-month warranty. This covers any issues arising from defects in materials and workmanship.

How do I know these will fit my machine?

Every order is backed by Verified OEM Fitment. Use our Fitment Finder to match tracks to your exact make and model, or contact us for free fitment verification before you buy. If a track doesn’t fit due to a sizing error on our end, we’ll make it right with a 100% money-back guarantee or immediate replacement.

What delivery options are available?

We deliver to:

  • Your Jobsite, Business, or Farm
  • Your Residence
  • The Nearest Freight Terminal

To ensure a seamless delivery, please include any specific instructions at checkout. Note: Residential deliveries may require an extra day for scheduling.

How quickly will my order ship?

Most orders ship same day from our multiple U.S. warehouses, with delivery in 1–3 business days nationwide. You’ll also receive tracking updates throughout so you can plan out your job accordingly.