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Heavy Duty D355 Dozer Parts Front Idler Supplier for Komatsu Bulldozer

High-strength Komatsu D355 dozer front idler (center-shaft type) designed for extreme mining and earthmoving conditions. Forged 42CrMo steel, HRC52–58 surface hardness, dual-sealed bearings, and precise machining ensure outstanding durability and performance. OEM-quality replacement for Komatsu D355 series.

Material50MN
Surface HardnessHRC52-58
ColorsBlack 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.

BULLDOZER UNDERCARRIAGE PARTS FOR INQUIRY NOW
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Description

The Komatsu D355 front idler is a heavy-duty undercarriage component designed to support and guide the dozer track chain while maintaining proper tension during operation. Unlike standard idlers, the D355 idler features a center-shaft structure with an integrated hub assembly, built to handle the immense loads generated by large crawler dozers. This unique configuration provides superior strength, better balance under heavy tension, and extended service life even in high-impact, abrasive environments.

Manufactured with strict dimensional tolerances and heat treatment control, this idler ensures reliable performance across tough working conditions such as mining, earthmoving, and quarry operations.

Robust Construction and Material Technology

Every D355 idler is crafted from high-strength forged steel, specifically 50Mn, chosen for its superior mechanical properties. The wheel body undergoes deep induction hardening, achieving a surface hardness of HRC 52–58, while the core remains tough and ductile to resist cracking under extreme loads.

The center shaft is precision-machined from forged alloy steel, then heat-treated to improve fatigue strength and minimize deformation. Dual-bearing seats are machined concentrically, ensuring perfect balance and smooth rotation even under high side loads.

A multi-layer sealing system effectively blocks contaminants such as mud, dust, and water—common in mining and construction sites—protecting the internal bearings from premature wear.

Manufacturing Process

Our Komatsu D355 idler is manufactured through a controlled six-step process to guarantee long-term durability and precision:

  1. Material Inspection – All alloy steel billets are tested for chemical composition and purity before forging.
  2. Forging & Rough Machining – The wheel body and shaft are forged and shaped for maximum density.
  3. CNC Precision Machining – Key dimensions, bearing bores, and mounting interfaces are machined to micrometer accuracy.
  4. Heat Treatment – Induction hardening and tempering create a strong outer surface with a flexible core.
  5. Assembly & Balance Testing – Shaft, bearings, and seals are assembled and dynamically tested for concentric rotation.
  6. Painting & Quality Inspection – Anti-corrosion coating is applied, and final inspection ensures compliance with OEM standards.
idler parts polishing
Polished Surface

This photo shows the idler after it has been carefully polished. The smooth surface reduces resistance against the track and minimizes wear.

undercarriage parts Idler
Final Packaging

This photo displays the finished idler safely packaged and ready for delivery, ensuring it reaches you in perfect condition.

Performance Features and Advantages

The center-shaft idler design offers significant advantages over traditional types:

  • Exceptional Load Bearing Capacity: The integrated shaft structure directly supports the track frame, evenly distributing heavy loads and reducing stress on mounting points.
  • Extended Service Life: The thick wheel rim and hardened tread resist abrasion from rocks and hard soil, maintaining proper shape even after prolonged use.
  • Improved Track Stability: Ensures consistent alignment and tension, reducing derailment risk and minimizing wear on track links and rollers.
  • Enhanced Lubrication System: The shaft incorporates an optimized oil cavity design, maintaining smooth operation under heavy-duty cycles.
  • Easy Maintenance: The idler assembly can be easily dismounted for shaft and bearing replacement, lowering downtime during field service.

OEM Compatibility and Replacement Options

Our Komatsu D355 idler meets or exceeds OEM specifications and is compatible with a wide range of D355 models and series.

  • Applicable Models: Komatsu D355A, D355C, D355D series dozers.

Each idler undergoes dimensional verification to ensure seamless installation and performance equivalence to original components.

BRAND MACHINERY MODEL NUMBER
KOMATSU D20 D21 D31 D37 D39 D41 D50 D53
D55 D57 D60 D61 D65 D68 D75 D80
D85 D85A-12 D87 D90 D95 D135 D155 D155A-1
D155A-2 D155A-3 D155A-5 D155AX-6 D155AX-7 D275 D275A-2 D275AX-5
D275AX-5EO D355 D355A-3 D375A-2 D375A-3 D375A-5 D375A-6 D375A-8
D475A-2 D475A-3 D475A-5 D475A-8 D475A-8EO D575A D575A-2 D575A-3
D65EX-12 D65PX-12 D61EX-15 D61PX-15 D61EX-24 D61PX-24 D37EX-21 D37PX-21
D39EX-21 D39PX-21 D39EX-24 D39PX-24 D51EX-22 D51PX-22 D51EX-24 D51PX-24
D85EX-15E0 D85PX-15E0 D85EX-18 D85PX-18 D155AX-8 D155AXi-8 D375A-8EO D475A-8EO

Looking for a specific make or model not listed here? Reach out and we’ll be happy to assist.

Quality Assurance and Inspection

Every unit is produced under ISO9001:2015 certified processes and tested before dispatch. Inspection includes:

  • Hardness and metallographic analysis
  • Bearing pre-load and concentricity test
  • Dynamic balance and vibration test
  • Corrosion and coating thickness verification

This ensures that each D355 idler maintains structural integrity and consistent reliability in field applications.

Maintenance Recommendations

To achieve the best service life and minimize wear:

  • Keep the undercarriage clean after each work cycle, removing packed mud or debris.
  • Regularly check the track tension and adjust if it becomes too tight or loose.
  • Periodically inspect the shaft seals and lubrication points to prevent dry rotation.
  • Replace damaged or worn track links early to avoid accelerated wear on the idler’s tread surface.

Following these simple maintenance routines helps extend the life of both the idler and the entire undercarriage system.

Application Scenarios

The Komatsu D355 dozer idler is widely used in open-pit mining, large-scale earthmoving, and heavy road construction. Its superior durability and shock absorption capability allow it to operate efficiently in harsh terrain, including rocky slopes, gravel pits, and dense clay environments. Whether for long-term quarry use or high-torque dozing, it guarantees reliability and balance under continuous heavy load.

Shipping & Delivery
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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.

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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.

BULLDOZER UNDERCARRIAGE PARTS FOR INQUIRY NOW

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