D6H D6R Sprocket Segment

Complete undercarriage parts kits for excavators provide all essential components for the machine’s track system, including rollers, sprockets, idlers, and track chains. Designed for durability and precision, these kits ensure smooth operation, reduce downtime, and simplify maintenance. Ideal for heavy-duty construction, mining, and earthmoving applications.

Part Number： 102-6677 173-0945 173-0946

Machine Model ： D6R D6H

Material ： 35MnB/40Mn

Color ： Yellow ,Black ,Blue ,Green , Orange

Technology： Casting & Forging

Relative Parts ： 102-6677 173-0945 173-0946

Warranty Time： 2000Hours

Inquiry

E-mail：tig@tigerlevel.com

WhatsApp：8615857482399

Undercarriage Parts: The Foundation of Tracked Machinery

The undercarriage is the chassis and propulsion system of tracked heavy equipment, such as excavators, bulldozers, and crawler loaders. It is a complex assembly of components that supports the machine's entire weight, provides mobility, and transfers power to the ground. Often called the "heart of the machine" or its "track system," a robust undercarriage is critical for stability, efficiency, and longevity in demanding terrain.

A standard undercarriage system consists of several integrated parts:

1. Track Chain (or Track Link Assembly):

Function: The core "chain" that forms the continuous loop. It consists of internal and external **links** connected by bushings and pins.

Purpose: Transmits drive force from the sprocket and carries the load through the rollers.

2. Track Shoes (or Pads):

Function: Bolted onto the track chain links. They are the ground-engaging components that make direct contact with the terrain.

Variations: Come in various widths and patterns (e.g., standard, rock, swamp, asphalt) to optimize performance for specific ground conditions.

3.Sprockets:

Function:*The segments or driven wheels located at the rear (or front, depending on configuration). They mesh with the track chain bushings to propel the machine.

Worn sprockets accelerate the wear of other undercarriage components.

Complete Undercarriage Parts Kits for Excavators

4.Idlers (Front Idler Wheels):

Function:Smooth, non-driven wheels at the front of the undercarriage. They guide the track and maintain proper track tension and alignment.

5. Rollers:

Function: A series of wheels that support the machine's weight on the track chain and guide its travel along the frame.

Types:

Upper Rollers (carrier rollers): Support the upper section of the track.

Lower Rollers (Track Rollers): Carry the main load on the bottom track section, rolling on the track chain links.

6. Track Adjustment System:

Function:Maintains optimal track tension to prevent slippage, excessive wear, and derailment. It typically consists of a hydraulic cylinder or screw mechanism that pushes the front idler forward or backward.

Importance of Maintenance:

Undercarriage parts are high-wear items due to constant friction, abrasion, and high-impact loads. Proper maintenance is essential for:

Cost Control:The undercarriage can represent up to 50% of a machine's repair costs. Proactive maintenance extends its life.

Fuel Efficiency: A poorly maintained, misaligned, or loose undercarriage increases rolling resistance, significantly raising fuel consumption.

Machine Performance & Safety: Excessive wear leads to poor traction, instability, track derailment, and potential damage to final drives.

Resale Value: The condition of the undercarriage is a primary factor in determining a used machine's value.

Complete Undercarriage Parts kits for excavators provide a fully integrated system that ensures stable operation, load-bearing capacity, steering performance, and smooth travel. The kits typically include track roller assemblies, track chains, tensioning and damping mechanisms, undercarriage frames, and connecting fasteners. They are widely compatible with small, medium, and large excavators and are applied in earthmoving, mining, infrastructure development, and municipal construction projects. These complete kits feature highly matched structures, uniform assembly precision, and excellent operational stability, allowing components to work in coordination, extending overall equipment life, reducing maintenance difficulty, and lowering total operational costs.

Complete Undercarriage Parts Kits for Excavators

High-quality materials such as high-strength alloy steel, wear-resistant cast steel, quenched and tempered structural steel, and spring steel are used in complete undercarriage kits. Advanced manufacturing processes, including precision casting, forging, overall heat treatment, and surface hardening, ensure balanced hardness, toughness, wear resistance, and impact performance for all components. Critical rotating parts are equipped with multi-layer dustproof and mudproof seals, effectively preventing the ingress of mud, dust, and water, which significantly extends the service life of bearings, bushings, and oil seals. The components are manufactured with high precision and interchangeability, allowing full replacement to original factory standards and enabling construction teams to quickly repair or replace worn parts.

The complete undercarriage kit features a clear division of functions and a comprehensive system:

Drive wheels transmit power with precise and stable gear engagement.
carrier rollers support the total machine weight and offer excellent wear resistance and sealing.
Idler rollers support the upper track and reduce running resistance.
Guide wheels and tensioning devices maintain correct track tension, minimizing the risk of derailment.
Track chains and track shoes form the travel system, ensuring grip and mobility.
Undercarriage frames provide a rigid foundation for installation and distribute loads evenly.
Pins, bushings, and bolts ensure secure connections and structural integrity.

Using a complete undercarriage kit prevents problems caused by mismatched component specifications or material differences, such as premature wear, uneven load distribution, noise, or leakage. It is especially suitable for operators seeking high stability and long continuous operation. Each complete system undergoes structural and load verification before leaving the factory, ensuring easy installation, consistency, and quick restoration of travel performance. These kits are ideal for full excavator overhauls or complete machine refurbishment.

Complete Undercarriage Parts Kits for Excavators

Complete excavator undercarriage parts Kit Composition

Component Category	Part Name	Typical Materials	Core Function
Track Roller Assembly	Drive Wheel	Wear-resistant cast steel, alloy steel	Transmits power, engages track for travel
Track Roller Assembly	Idler Wheel	Alloy structural steel	Guides and tensions track, prevents derailment
Track Roller Assembly	Carrier Roller	40Cr, 42CrMo	Supports full machine weight, wear-resistant and well-sealed
Track Roller Assembly	Track Support Roller	Alloy cast steel, quenched steel	Supports upper track, reduces running resistance
Track Chain Assembly	Track Chain	45MnB, 40Mn2	High tensile strength, ensures travel loop closure
Track Chain Assembly	Track Shoe	High manganese steel, wear-resistant alloy steel	Anti-slip, impact-resistant, improves terrain performance
Tensioning Mechanism	Track Tensioner	Spring steel, alloy structural steel	Adjusts track tension, absorbs shocks and vibration
Fasteners & Connectors	Pins and Bushings	20CrMnTi, 45# steel	Connects components, wear-resistant and shear-proof

Complete undercarriage kits are optimized from design, material selection, and manufacturing according to system-matching principles, significantly enhancing equipment reliability and uptime. As excavators evolve toward larger sizes and heavier loads, complete undercarriage kits continue to advance in service life, sealing performance, and precision, providing comprehensive support for stable and efficient operation under complex and harsh working conditions.