Track-Link Assy

Introduction

The undercarriage is the foundation of every crawler excavator. It carries the machine’s entire weight, absorbs ground impact, and provides the traction and stability needed for digging, lifting, and travelling on rough terrain. When undercarriage components wear out, machine productivity drops, fuel consumption rises, and downtime increases.

We supply a complete range of excavator undercarriage parts designed for durability, precise fit, and long service life. From track chains and track shoes to sprockets, idlers, rollers, and recoil springs, our parts are manufactured to meet or exceed OEM specifications for major excavator brands including CAT, Komatsu, Hitachi, Hyundai, Doosan, Kobelco, Volvo, Sany, and XCMG.

Description

Excavator undercarriage parts form the complete crawler system that supports the machine and moves it across the job site. Each component plays a specific role in load distribution, traction, and alignment.

Main components include:

Track Link Assembly – The chain that connects track shoes and runs around the sprocket and idler.

Track Shoes / Track Pads – Bolt onto the track links to provide ground contact, traction, and flotation.

Sprockets – Drive the track chain and transfer power from the final drive.

Idlers – Guide the track chain at the front of the undercarriage and maintain tension.

Track Rollers (Bottom Rollers) – Support the machine’s weight and roll along the track link rail.

Carrier Rollers (Top Rollers) – Hold the track chain up and prevent excessive sag.

Track Adjusters & Recoil Springs – Maintain proper track tension and absorb shock loads.

Final Drives / Travel Motors – Provide power to the sprockets for forward and reverse travel.

Track Frames & Guards – Structural supports that hold the undercarriage components in alignment.

Why quality undercarriage parts matter:

Longer service life – Heat-treated alloys and precision machining reduce wear.

Lower operating cost – Better fuel efficiency and less downtime.

Improved stability – Correct track tension and alignment keep the machine safe.

Perfect fit – Parts are matched to specific excavator models and serial number ranges.

Whether you are replacing a worn track chain, rebuilding a complete undercarriage, or stocking fast-moving parts, choosing the right components is critical. We help you identify the correct parts by brand, model, and part number.

Track Link Assembly

The track link assembly is the backbone of an excavator’s undercarriage. It is the continuous chain that connects the track shoes and wraps around the sprocket, idler, and rollers. Every time the machine moves, the track link assembly carries the load, transmits drive force, and absorbs shock from uneven ground.

A worn or broken track link assembly can stop a job site immediately. That is why we supply heavy-duty track link assemblies engineered for high tensile strength, excellent wear resistance, and long service life in the toughest conditions.

Description

A track link assembly is made up of individual track links connected by pins and bushings. The links are bolted to track shoes, forming the complete crawler track. The assembly runs under the excavator and is driven by the sprocket.

Construction and materials:

Links – Forged or cast from high-strength alloy steel, then heat-treated for core toughness and surface hardness.

Pins and Bushings – Precision-ground and hardened to resist wear and fatigue.

Seals – Some assemblies use sealed and lubricated track (SALT) to reduce internal wear and extend life.

Track Shoes – Bolt to the links and provide the actual ground contact.

Common types of track link assemblies:

Standard Duty – For general digging and normal soil conditions.

Heavy Duty – Thicker links and larger pins for abrasive ground and high-impact work.

Extreme Service – Reinforced design for mining, quarry, and demolition applications.

Sealed & Lubricated (SALT) – Oil-filled pins and bushings reduce internal wear and increase service intervals.

Positive Pin Retention (PPR) – Mechanical lock keeps pins from walking out under extreme side loads.

Applications:

Track link assemblies are used on crawler excavators, bulldozers, crawler cranes, and drilling rigs. They are available in a wide range of pitches, link heights, and bolt hole patterns to suit different machine sizes and applications.

Maintenance tips:

Check track tension regularly to prevent premature wear.

Inspect pins, bushings, and seals for looseness or leakage.

Replace worn sprockets at the same time as track links to avoid accelerated wear.

Keep the undercarriage clean and avoid operating with broken or missing track shoes.

If you know your excavator brand, model, and serial number, we can help you find the correct track link assembly and matching undercarriage parts for your machine.