Wholesale CAT306 Top Track Roller Assy for Caterpillar Excavator
Heavy-duty CAT306 Mini Excavator Track Rollers engineered for outstanding durability, reliable sealing, and long-lasting undercarriage performance. Designed to match OEM standards, these rollers provide smooth travel, reduced wear, and consistent operation in the toughest working environments.
| Material | 50Mn/40MnB |
|---|---|
| Surface Hardness | HRC53-58,deepth: 8-12mm |
| Colors | Black or yellow or customized |
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Kinton Parts is trusted by professionals worldwide for delivering high-quality parts for excavators, bulldozers, and other construction machinery—with guaranteed performance and durability.
The CAT306 Track Roller (also called bottom roller or lower roller) is an essential part of the excavator undercarriage system. It supports the track chain, maintains proper track tension, and ensures stable weight distribution during operation. Without reliable rollers, mini excavators risk unstable movement, premature track wear, and costly downtime.
Our CAT306 replacement track rollers are manufactured using premium forged alloy steel with advanced heat treatment for exceptional hardness and impact resistance. Equipped with a high-performance sealing and lubrication system, they are designed to withstand heavy loads, abrasive soil conditions, and long working hours—delivering extended service life and reduced maintenance costs.
Materials and Heat Treatment of CAT Track Rollers
Our track roller body is forged from high-strength 45# steel, with the surface undergoing precision heat treatment to a hardness range of HRC 52–58. This improves wear resistance, especially in frequent start-stop operations common in mini excavators. The inner bushings use premium alloy steel such as 40Cr or 42CrMo, ensuring long-term durability under rotation and friction.
Production Workflow of Caterpillar 306 Track Rollers
Each KINTON PARTS track roller is manufactured through a controlled multi-step process. From material strengthening to final inspection and packing, every stage is designed to ensure stable performance, consistent quality, and long service life under heavy-duty working conditions.
Heat Treatment
Critical components of the track roller undergo precise heat treatment to improve surface hardness and internal strength. This process enhances wear resistance on rolling surfaces while maintaining a tough core structure, allowing the roller to withstand continuous load and impact during operation.
Polishing
After heat treatment, the rolling surfaces are carefully polished to achieve a smooth and uniform finish. Proper polishing reduces friction between the roller and track chain, minimizes abnormal wear, and helps ensure smooth movement during operation.
Assembly
All components, including the roller body, shaft, bushings, seals, and floating seals, are assembled under controlled conditions. Proper assembly ensures correct internal alignment, reliable sealing performance, and stable load distribution inside the roller.
Running Test
Each assembled track roller is subjected to a running test to verify rotation smoothness, sealing integrity, and overall performance. This step helps identify potential issues before shipment and ensures the roller operates reliably under real working conditions.
Paint Spraying
The external surface is coated using controlled paint spraying to provide corrosion protection and a clean, durable finish. This protective layer helps prevent rust and surface damage during storage, transportation, and on-site operation.
Packing
Finished track rollers are carefully packed to protect sealing areas and machined surfaces from impact, moisture, and contamination. Secure packing ensures the product arrives in good condition and ready for installation.
Every CAT306 bottom roller is designed to perform under extreme conditions, ensuring stable excavator performance and a longer undercarriage life
| 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.
Compatible Models
These track rollers are designed specifically for the CAT306 mini excavator. However, we can also supply several other Caterpillar mini excavators, such as:
- CAT 301.7, 302.5, 302.7
- CAT 303.5, 304, 305, 306
Please confirm the part number before ordering.
Strict Quality Assurance for CAT306 Track 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 CAT306 Mini Excavator Track Roller
The Caterpillar CAT306 track 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.
Why Choose Our CAT306 Track Rollers?
- 100% OEM fit and performance
- Premium steel with advanced heat treatment
- Leak-proof sealing for long service life
- Proven durability in tough jobsite conditions
- Cost-effective replacement for OEM parts
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.
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Trusted by professionals worldwide, Kinton Parts supplies premium-quality components for excavators, bulldozers, and more—with reliable quality you can count on.
