D7G Dozer Top Carrier Roller Replacement for CAT Bulldozer
The Caterpillar D7G bulldozer carrier roller is a heavy-duty undercarriage component designed to support the track chain from above, keeping it aligned and stable during continuous operation. Built from premium alloy steel and precision-machined for durability, this roller provides excellent wear resistance and reliable performance in demanding construction and mining 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 carrier roller, also known as the upper roller, is an integral part of the D7G bulldozer’s undercarriage system. Its primary role is to guide the track chain smoothly, reduce vibration, and distribute the load evenly across the track frame. A well-manufactured carrier roller minimizes chain wear, prevents derailment, and ensures the bulldozer maintains strong traction on rough terrain. For a large crawler dozer like the D7G, which is often deployed in mining, land reclamation, and heavy construction projects, the stability provided by the carrier roller is critical for both efficiency and operator safety.
Materials and Manufacturing Process
Each roller is made from high-quality alloy steels such as 40Mn2 or 50Mn, known for their hardness and toughness balance. After forging, the rollers undergo precise heat treatment, achieving a surface hardness of HRC 52–58 while retaining a tough, impact-resistant core. This dual property allows the roller to resist both abrasive wear and sudden shock loads.
Manufacturing includes forging and rough shaping, followed by CNC machining to achieve exact tolerances. Sealing and bearing components are carefully fitted to ensure protection against dust, mud, and moisture. Every roller passes a series of inspections—including hardness checks, dimensional accuracy testing, and load-bearing trials—before being released for delivery. This strict production cycle guarantees consistency and reliability in every unit.
Heat Treatment
Machining Process
CNC turning and milling ensure dimensional accuracy
Packing
OEM Compatibility and Replacement
The D7G bulldozer carrier roller is designed to match OEM standards, making it a direct replacement part with no modifications required. It can be used interchangeably with original Caterpillar rollers, offering contractors and equipment owners a cost-effective and reliable alternative. OEM reference numbers are available upon request, and customized solutions can be offered for customers who operate in specific environments such as rocky quarries or swampy ground.
- D7 D7R carrier roller reference part number: 1P8717
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| CATERPILLAR | D2 | D3 | D4 | D5 | D5K2 | D5N | D6R | D6K2 |
| D6N | D6T | D7R | D7E | D7G | D8R | D8T | D9T | |
| D9R | D9 | D10N | D10T | D11T | D8T | D9T | D10T | |
| D10T2 | D11 | D11R | D11T | D11T2 | D10T | D11T | D11R | |
| D11T | D11R | D11T | D8T | D8R | D9T | D9R | D10T | |
| D10T2 | D11R | D11T | D11R | D11T | D10T2 | D11T | D11R | |
| D6K2 | D6K2 LGP | D6N | D6N LGP | D6T | D6T LGP | D4K2 | D4K2 LGP | |
| D5K2 | D5K2 LGP | D6K2 | D6K2 LGP | D6N | D6N LGP | D6K2 | D6K2 LGP | |
| D8T | D8T LGP | D8R | D8R LGP | D9T | D9T LGP | D10T2 | D11T | |
Looking for a specific make or model not listed here? Reach out and we’ll be happy to assist.
Key Advantages
Compared with standard aftermarket rollers, our Caterpillar D7G carrier roller offers:
- Longer wear life thanks to optimized steel composition and surface treatment.
- Smooth track guidance that reduces stress on the chain and sprockets.
- Reliable sealing that maintains lubrication and prevents premature bearing failure.
- Consistent performance in diverse environments, from dusty construction sites to wet and abrasive conditions.
Application Scenarios
This carrier roller is ideally suited for large-scale earthmoving operations where the D7G bulldozer is typically used. Common applications include mining, heavy construction, land clearing, and infrastructure projects. In these environments, equipment reliability is essential, and undercarriage components such as the carrier roller directly influence machine productivity and cost efficiency.
Maintenance and Care
To maximize service life, it is recommended that operators regularly inspect rollers for oil leakage, unusual wear, or damage to the sealing system. Track chain tension should be checked to ensure even load distribution, and rollers should be replaced in sets or pairs to maintain balance across the undercarriage. Following these practices will reduce downtime and help protect the rest of the undercarriage system from accelerated wear.
Packaging and Delivery
Each Caterpillar D7G carrier roller is coated with anti-rust oil before being packed in durable wooden crates or palletized boxes. Packages are clearly labeled for easy identification, and shipments are handled with care to ensure products arrive ready for installation.
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.
