Komatsu PC300 Excavator Parts Upper Carrier Roller Replacement 207-30-00551
This carrier roller (207-30-00551) for the Komatsu PC300 excavator ensures smooth track operation by supporting the upper section of the crawler system. Engineered for heavy-duty performance in mining, earthmoving, and construction environments, this upper roller enhances track alignment and minimizes wear during continuous operation.
| 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.
This carrier roller for Komatsu PC300 excavator is engineered to support the upper track chain and ensure stable track movement in heavy-duty operations. As a key component in the excavator upper undercarriage system, it helps maintain proper chain positioning, reduces track sag, and improves overall machine stability during continuous work. Its durable design minimizes track misalignment and abnormal wear on track links, pins, and bushings. The roller performs reliably in harsh environments, including quarries, heavy earthmoving, and construction sites with uneven or abrasive terrain.
Compatible with Komatsu PC300 Excavator
This carrier roller is specifically designed for the Komatsu PC300 series, ensuring optimal fit and performance in demanding excavation environments. It features precise dimensions and mounting points consistent with OEM specifications, making it suitable for a range of Komatsu excavators.
Confirmed Compatible Models:
Komatsu PC300 series, PC300-6 / PC300LC-6 / PC300-7
Note: While this roller is mainly designed for PC300, it is also interchangeable with PC300-3 and PC300-6 models that share compatible frame and undercarriage setups. Always compare mounting dimensions or consult us for confirmation.
OEM Reference Numbers:
- 207-30-00551, 207-30-00621
We highly recommend verifying your machine’s serial number or sharing the dimensioned drawing to confirm exact fitment—especially if your unit has undergone prior undercarriage modifications or rebuilds.
High-Strength Materials and Heat-Treated Components
Material Specification
To handle the PC300’s demanding applications, this carrier roller is built using:
- Roller body: 50MN-45 forged steel
- Shaft: 40Cr with induction hardening (HRC 52–58)
- Floating seals: Industry-standard face seals for grease retention
- Bushing: Precision-honed, wear-resistant alloy
These materials ensure optimal load capacity, high resistance to deformation, and protection from contamination in dusty, muddy, or wet environments.
Heat Treatment & Surface Hardening
Our rollers go through uniform quenching and tempering processes to ensure:
- High surface hardness and core toughness
- Resistance to fatigue and cracking under cyclic loads
- Prolonged operational life even in extreme climates
It is a highly cost-effective alternative to excavator track parts.
Heat Treatment
Machining Process
CNC turning and milling ensure dimensional accuracy
Packing
OEM Undercarriage Parts for Komatsu
We not only supply track rollers, but also a wide variety of excavator spare parts. Below is a list of excavator models for which we offer spare parts. Please feel free to contact us with any needs. We supply spare parts not only for Komatsu excavators, but also for other brands such as Lonking, LiuGong, Sany, and Caterpillar.
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| KOMATSU-PC | PC20 | PC30-5 | PC30-6 | PC30-7 | PC30-8 | PC35 | PC40 | PC45 |
| PC50 | PC55 | PC40-5 | PC40-6 | PC40-7 | PC50 | PC55 | PC60-1 | |
| PC60-3 | PC60-5 | PC60-6 | PC60-7 | PC75 | PC100-1 | PC100-3 | PC100-5 | |
| PC100-6 | PC100-7 | PC120-3 | PC120-5 | PC120-6 | PC120-7 | PC150 | PC200-1 | |
| PC200-3 | PC200-5 | PC200-6 | PC200-7 | PC200-8 | PC220-1 | PC220-3 | PC220-5 | |
| PC220-6 | PC220-7 | PC220-8 | PC200LC-3 | PC200LC-5 | PC200LC-6 | PC200LC-7 | PC200LC-8 | |
| PC240 | PC300-1 | PC300-5 | PC300-6 | PC300-7 | PC300LC | PC300LC-5 | PC300LC-6 | |
| PC300LC-7 | PC360-5 | PC360-6 | PC360-7 | PC360LC-5 | PC360LC-6 | PC360LC-7 | PC360LC-8 | |
| PC400-1 | PC400-3 | PC400-5 | PC400-6 | PC400-7 | PC400LC-1 | PC400LC-3 | PC400LC-5 | |
| PC400LC-6 | PC400LC-7 | PC450-5 | PC450-6 | PC450-7 | PC450LC-5 | PC450LC-6 | PC450LC-7 | |
| PC650 | PC750 | PC800 | PC350 | |||||
Looking for a specific make or model not listed here? Reach out and we’ll be happy to assist.
OEM Undercarriage Parts for Komatsu
This product stands out for:
- OEM fit and function, ready for direct installation
- Better sealing and wear resistance than many aftermarket alternatives
- Factory-direct pricing with no quality compromise
- Suitable for high-load and high-vibration conditions
- Support for color customization or logo branding
Compared to generic rollers, ours maintain roundness and seal tightness longer, especially important for large-scale operations.
Application Scenarios – Where PC300 Carrier Rollers Perform
This carrier roller is ideal for:
- Quarry and aggregate sites
- Road and bridge construction
- Open-pit mining
- Earthmoving and slope grading
Its ability to keep the upper track aligned ensures smoother ride quality and minimizes downtime caused by derailment or track damage.
OEM Undercarriage Parts for Komatsu
To maximize lifespan and avoid downtime:
- Regularly inspect for leaks or deformation
- Remove debris or dried mud from roller area
- Ensure seals remain intact and properly greased
- Replace any worn rollers to prevent chain misalignment
Even the upper rollers, though not load-bearing, are crucial to the health of your entire undercarriage.
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.
