Carrier Roller for Caterpillar E303 Mini Excavator Undercarriage
The carrier roller for Caterpillar E303 plays a crucial role in maintaining upper track alignment and reducing wear on the undercarriage system. Though small in size, this component ensures stable machine movement by supporting the top section of the track chain. Built to endure the rigors of compact job sites, our E303 carrier roller is precision-engineered to offer long-lasting performance and reliability.
| Material | 50Mn/40MnB |
|---|---|
| Surface Hardness | HRC53-58,deepth: 8-12mm |
| Colors | Black or yellow or customized |
Quick Quote Request
Kinton Parts is trusted by professionals worldwide for delivering high-quality parts for excavators, bulldozers, and other construction machinery—with guaranteed performance and durability.
In the Caterpillar E303, the carrier roller is mounted on the upper side of the undercarriage to guide and support the top run of the rubber or steel track. This reduces track sagging and prevents derailment during frequent direction changes or slope work—common in urban construction, landscaping, and utilities maintenance. A worn or poorly designed upper roller can cause misalignment, affect machine control, and accelerate wear on sprockets and idlers.
A high-quality carrier roller improves not only the durability of your track chain but also the overall operational smoothness of the machine—especially critical for precise maneuvering in compact workspaces.
Integrated Design with Durable Material and Heat Treatment
Our E303 carrier roller is forged from premium alloy steel (40Mn or 50Mn), ensuring high resistance to shock, pressure, and environmental corrosion. After precision CNC machining, the roller undergoes surface induction hardening to achieve HRC52–58 hardness on the working surfaces, greatly enhancing wear resistance.
This process is combined with integrated oil-sealing systems and high-quality bushings, effectively preventing lubrication loss and extending service intervals. By combining material strength with smart engineering, we provide a solution that fits both OEM replacement and performance upgrade needs.
Manufacturing Process for E303 Carrier Roller
Kinton’s production process includes forging, machining, heat treatment, and rigorous quality testing. Each roller is measured for dimensional accuracy, concentricity, and surface hardness. Final assembly includes lubrication and seal inspection to ensure the unit is ready for immediate installation.
We don’t just meet OEM standards—we work to exceed them.
Heat Treatment
Machining Process
CNC turning and milling ensure dimensional accuracy
Packing
OEM Undercarriage Parts for Caterpillar
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| CATERPILLAR-CAT | CAT55 | CAT225 | CAT245 | CAT311 | CAT312 | CAT312B | CAT315 | CAT320 |
| CAT320B | CAT320C | CAT320D | CAT320L | CAT322 | CAT324 | CAT325 | CAT325B | |
| CAT325BL | CAT330 | CAT330B | CAT330BL | CAT330C | CAT330D | CAT345 | CAT345B | |
| CAT973 | E55 | E70 | E70B | E120 | E120-1 | E120B | E140 | |
| E200B | E200-5 | E215 | E240 | E300B | E300L | E311 | E312 | |
| E312B | E320 | E320BL | E320C | E320D | E320DL | E320L | E320S | |
| E322B | E322C | E324 | E324D | E324DL | E325 | E325B | E325L | |
| E329DL | E330 | E330B | E330C | E330D | E330DL | E345 | E345B | |
| E450 | CAT301.5 | CAT302.5 | CAT303.5 | CAT305 | CAT307 | CAT308 | CAT313 | |
| CAT316 | CAT318 | CAT320E | CAT320GC | CAT323 | CAT326 | CAT329 | CAT336 | |
| CAT340 | CAT349 | CAT350 | CAT365 | CAT374 | CAT375 | CAT385 | CAT385CL | |
| CAT390 | CAT390D | CAT390DL | CAT390FL | CAT395 | CAT6015 | CAT6015B | CAT6015D | |
| CAT6020 | CAT6020B | CAT6030 | CAT6030B | CAT6030D | CAT6040 | CAT6040B | ||
Looking for a specific make or model not listed here? Reach out and we’ll be happy to assist.
OEM Reference Numbers and Model Compatibility
Our carrier roller is a direct-fit replacement for Caterpillar E303, fully compatible with the following OEM part numbers:
- 239-4543
- 267-8352
- 336-9175
- 118-1619
These part numbers correspond to various production years and versions of the E303. Our product ensures hassle-free installation, with precise dimensions for mounting and bearing interface.
Strict Quality Assurance for CAT E303 Top Roller
To meet the demands of compact construction and landscaping work, we apply comprehensive quality control:
- Dimensional inspection with high-precision gauges
- Surface hardness and depth verification
- Leak testing for internal lubrication systems
- Balanced weight for even track wear
Only certified rollers with consistent performance are packed and shipped.
Application Scenarios for E303 Mini Excavator Carrier Roller
The Caterpillar E303 upper roller is ideal for:
- Urban construction
- Landscaping and utility works
- Foundation trenching
- Small-scale demolition tasks
Its compact size and durability make it perfect for jobs that require high maneuverability and stable undercarriage contact.
Maintenance Recommendations for Extended Lifespan
Keep the roller clean and free from dirt buildup that could impair rotation. Regularly check for oil leaks or damaged seals, especially in high-dust environments. If you notice wobbling or squeaking noises during travel, inspect for internal bushing wear or surface scoring. Proper care not only extends roller life but also protects your tracks and related parts from premature damage.
SHIPPING & DELIVERY
At Kinton Parts, we ensure reliable, worldwide shipping of parts for excavators, bulldozers, and a full range of construction machines—safe, fast, and secure.
All products are securely packed using high-quality export cartons, reinforced wooden cases, or industry-standard palletized packaging to ensure maximum protection during transit and smooth handling during unloading.
Standard orders are typically shipped within 3–5 working days, while large or customized orders are usually dispatched within 7–20 days, depending on volume and production requirements.
We offer flexible global shipping options, including:
- International sea freight for cost-effective bulk transport
- Air freight for urgent orders
- Courier delivery (DHL, FedEx, UPS) for small-volume or sample shipments
Our logistics team manages every shipment carefully, providing real-time updates and tracking information until your order arrives safely at your destination.
Need assistance choosing the best shipping method for your location and timeline? Contact our team — we’ll help you plan a smooth delivery experience.
FAQ
Q: What are your main products?
A: We supply a full range of undercarriage and wear parts for excavators, bulldozers, and other heavy equipment. Our product line includes: Track rollers, carrier rollers, front idlers, sprockets, segments, track shoes, track chains, bolt and nuts, pins and bushings, bucket teeth and adaptors, filters, seal kits, swing bearing, and hydraulic cylinder—plus other essential replacement parts.
Q: Which countries do you export to?
A: Kinton Parts exports to over 60 countries worldwide, including:
USA, Canada, UK, Germany, Russia, UAE, Indonesia, Malaysia, Thailand, India, Pakistan, Bangladesh, Sri Lanka, South Africa, Colombia, Peru, and many others.
Q: Can I order a sample?
A: Yes, we accept trial orders. For parts in stock, samples can be shipped quickly. If you have technical drawings or existing samples, we also support customized production and mold development.
Q: How can I track my order after shipping?
A: Once your order is shipped, we will provide you with all necessary tracking information based on the shipping method. For express deliveries, you’ll receive a tracking number to follow the shipment online. For air or sea freight, we’ll send you the relevant documents such as the airway bill (AWB) or bill of lading (B/L), along with the packing list and commercial invoice to help with tracking and customs clearance.
Quick Quote Request
Trusted by professionals worldwide, Kinton Parts supplies premium-quality components for excavators, bulldozers, and more—with reliable quality you can count on.
