D31 Bulldozer Undercarriage Parts Front Idler Wheel for Komatsu Dozer

The Komatsu D31 bulldozer idler is a heavy-duty undercarriage component designed to guide and tension the track chain while absorbing impacts during operation. Manufactured with premium alloy steel and advanced heat treatment technology, it ensures excellent wear resistance, long service life, and full compatibility with Komatsu OEM specifications.

Material50Mn/40MnB
Surface HardnessHRC53-58,deepth: 8-12mm
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
Description

The idler in the Komatsu D31 bulldozer plays a central role in the undercarriage system. Positioned at the front of the track frame, it maintains track chain alignment, ensures proper chain tension, and absorbs ground impact. This helps the bulldozer achieve smooth forward and reverse travel, while also minimizing wear on track rollers, links, and sprockets.

For a medium-duty crawler bulldozer like the D31, often used in roadwork, land clearing, small-scale mining, and construction site leveling, a durable idler is essential to maintaining stability, reducing vibration, and avoiding costly downtime caused by premature failures.

Materials and Heat Treatment

The Komatsu D31 idler is produced using high-strength alloy steels such as 40Mn2 or 50Mn. After forging, it undergoes strict heat treatment to balance hardness with toughness:

  • Surface Hardness: HRC 52–58, providing excellent resistance to wear from soil, sand, and gravel.
  • Core Strength: Maintains internal ductility to withstand heavy shock loads without cracking.
  • Sealed Bearing Design: Keeps lubrication inside while preventing entry of mud, dust, and water, extending bearing life.

This combination of material and heat treatment ensures durability across varied working conditions, from soft clay soils to abrasive rocky environments.

Manufacturing Process

Each Komatsu D31 idler follows a strict production process to guarantee performance and quality:

Forging & Shaping – Alloy steel billets are forged into dense, uniform blanks.

CNC Machining – Precision machining ensures accurate dimensions and smooth surfaces.

Heat Treatment – Controlled hardening and tempering create wear resistance with impact toughness.

Assembly – Sealing groups, shafts, and bushings are installed to prevent oil leakage.

Quality Testing – Each idler is tested for concentricity, load-bearing capacity, and surface hardness before delivery.

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.

Application Scenarios

The D31 bulldozer is widely used in construction, agriculture, forestry, and small-scale mining. Its compact size and versatility allow it to work in tighter spaces while still handling heavy-duty tasks. A robust idler ensures consistent track chain performance whether the machine is pushing soil on a slope, clearing land for agriculture, or compacting construction sites. By stabilizing the undercarriage, the idler improves traction and ensures efficient power transfer from engine to ground.

Key Features and Advantages

Compared with many aftermarket options, this Komatsu D31 idler offers:

  • Enhanced wear resistance with advanced alloy steel composition.
  • Precision sealing system, keeping lubrication intact for longer service intervals.
  • Stable track chain guidance, reducing vibration and uneven wear.
  • Lower overall operating cost due to extended service life.

OEM Undercarriage Parts for Komatsu Bulldozer

The Komatsu D31 bulldozer idler is fully compatible with OEM specifications, ensuring easy installation and reliable performance. It can directly replace OEM parts without modifications, making it an ideal aftermarket solution for repair and maintenance. OEM part numbers and casting codes can be confirmed upon request to help customers identify the right fit.

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.

Maintenance Recommendations

To maximize the service life of the Komatsu D31 idler, regular inspection and maintenance are essential:

  • Monitor track tension frequently and adjust as necessary to avoid overloading.
  • Check for oil leaks or worn seals around the idler.
  • Inspect for cracks or excessive wear on the running surface.
  • Replace idlers in pairs or as part of undercarriage service to ensure balanced wear.

With proper maintenance, the idler can withstand thousands of working hours, reducing unexpected downtime.

Packaging and Delivery

Every idler is coated with anti-rust oil and packaged in durable wooden crates or palletized boxes. Packaging is optimized for safe long-distance transport, ensuring that the idler arrives ready for installation. Each package is labeled for easy identification and handling.

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.

excavator parts loading truck 4
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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