The EX300 idler wheel plays a crucial role in guiding the track forward and backward while absorbing shock and reducing wear. Positioned at the front of the undercarriage, it maintains proper track tension and prevents track derailment, improving stability, maneuverability, and overall operational efficiency — whether you’re excavating clay-rich soil, gravel, sand, or hard clay formations.
EX300 Idler Wheel Undercarriage Component fit Hitachi
The Hitachi EX300 idler wheel is a key component of your excavator’s undercarriage, guiding the track smoothly and keeping it properly aligned under heavy workloads. Built from high-strength materials and finished with a protective coating, this idler delivers reliable performance and a longer service life — reducing maintenance and downtime in tough conditions.
| 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.
Description
Material, Manufacturing Process & Structural Advantages
The EX300 idler is made from high-strength alloy steel to handle heavy loading and resist wear under challenging conditions.
During production, the component undergoes a rigorous forging and precision machining process to achieve an accurate profile and dimensions. The surface is then induction hardened to HRC 52-58, adding wear resistance while retaining a tough, shock-absorbing core.
The bushings and seals are manufactured to close tolerances to minimize friction and prolong service life. Furthermore, protective coatings are applied to resist corrosion and oxidation, allowing the idler to perform optimally in muddy, gravel-rich, or hard clay environments.
Idler Wheel Manufacturing Process
The production of an EX300 idler wheel involves a series of carefully controlled steps to assure the highest quality and durability:
- Material Selection:
We start by choosing high-strength alloy steel (such as 40Mn or 50Mn) to provide a tough, wear-resistant base. - Forging:
The raw material is heated to a high temperature and forged into a rough idler shape under immense pressure. This process increases density, toughness, and resistance to shock. - Precision Machining:
Using advanced CNC equipment, we cut and shape the forged piece to its exact dimensions. Bushings, bores, and flanges are finished to match stringent tolerance requirements. - Heat Treatment:
To maximize surface hardness and wear resistance while retaining a tough core, the idler undergoes induction hardening or quenching and tempering. This process results in a durable outer layer and a resilient interior. - Surface Coating and Final Inspection:
Once cooled, the idler is treated with a protective coating to resist corrosion and abrasion. Each piece then undergoes rigorous quality checks — dimensions, material properties, surface finish — to assure it meets all performance criteria.
Here are a few authentic photos from our factory, offering a clear view of our production capabilities and genuine manufacturing process.
Polished Surface
This photo shows the idler after it has been carefully polished. The smooth surface reduces resistance against the track and minimizes wear.
Final Packaging
This photo displays the finished idler safely packaged and ready for delivery, ensuring it reaches you in perfect condition.
Compatible Models and Serial Numbers
The EX300 idler wheel is designed to match:
- Hitachi EX270, EX280, EX300, EX330, and variants with similar undercarriage dimensions
- Other models in the EX Series with compatible components
Some commonly referenced serial numbers (for your consideration; please check against your own machine’s details) include:
- 9071451
- 9071452
- 9071453
If you’re unsure about compatibility, please provide us with your excavator’s model and serial number, and we’ll match you with exactly the right components.
OEM Undercarriage Parts for Hitachi Excavator
| BRAND | MACHINERY MODEL NUMBER | |||||||
|---|---|---|---|---|---|---|---|---|
| HITACHI-EX/ZAX/ZX | EX30 | EX40 | EX55 | EX60 | EX60-2 | EX60-3 | EX60-5 | EX70 |
| EX75 | EX100 | EX100-3 | EX100-5 | EX120 | EX120-1 | EX120-3 | EX120-5 | |
| EX130-1 | EX200-1 | EX200-2 | EX200-3 | EX200-5 | EX200LC-1 | EX200LC-2 | EX200LC-3 | |
| EX200LC-5 | EX220-3 | EX220-5 | EX270 | EX270-1 | EX270-2 | EX270-5 | EX270LC-1 | |
| EX270LC-2 | EX270LC-5 | EX300 | EX300-1 | EX300-2 | EX300-3 | EX300-5 | EX300A | |
| EX300LC-1 | EX300LC-2 | EX300LC-3 | EX300LC-5 | EX330 | EX370 | EX400-1 | EX400-2 | |
| EX400-3 | EX400-5 | EX400LC-1 | EX400LC-2 | EX400LC-3 | EX400LC-5 | EX450 | EX450-1 | |
| EX450-2 | EX450-3 | EX450-5 | EX450LC-1 | EX450LC-2 | EX450LC-3 | EX450LC-5 | UH07-7 | |
| ZAX30 | ZAX55 | ZAX200 | ZAX200-2 | ZAX330 | ZAX450-1 | ZAX450-3 | ZAX450-5 | |
| ZX30 | ZX33 | ZX38U | ZX40 | ZX55 | ZX60 | ZX70 | ZX75US | |
| ZX120 | ZX130 | ZX160LC | ZX200 | ZX210 | ZX240 | ZX270 | ZX330 | |
| ZX360 | ZX400 | ZX450 | ZX470 | ZX500 | ZX650 | ZX850 | ZX870 | |
Looking for a specific make or model not listed here? Reach out and we’ll be happy to assist.
Application of ZX300 in Extreme Working Conditions
The EX300 idler performs exceptionally well under tough conditions — whether you’re excavating clay-rich soil, gravel, sand, or hard clay formations. The hardening process and protective coating help it resist abrasion and shock, extending service intervals and reducing maintenance and downtime. Designed to operate smoothly in harsh terrains — from mining sites and quarries to forestry and roadworks — this idler guides the track accurately, prevents derailments, and maintains proper track tension, contributing to a more stable, productive, and cost-effective operation.
Why Choose Our EX300 Idler Wheel?
Choosing our EX300 idler means you’re investing in a component designed for durability, reliability, and performance. Our extensive manufacturing expertise, rigorous quality control, and use of high-grade materials result in an idler that stands up to heavy workloads and challenging conditions. It reduces wear on your undercarriage components, cuts maintenance expenses, and minimizes downtime — delivering a lower total cost of ownership.
Shipping & Delivery
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.
