All the performances of 35MnBH steel could meet the requirements of technical conditions through such measures as micro-alloying, establishing strict and reasonable production engineering as well as narrow control for composition of molten steel based on those of 35MnB.

Mainly used in Excavator and Bulldozer undercarriage manufacturing, 35MnBH steel Requires high purity and uniformity of ingredients to reach good organizational structure, mechanical properties and good quality of the appearance. It’s chemical composition is as following.

Chemical  Composition（%）

Low Magnification

C

Si

Mn

P

S

Cr

Ti

Als

Ni

Cu

Mo

B

General Loosen

Center Porosity

Center Segregation

0.38

0.24

1.24

0.017

0.002

0.21

0.042

0.031

0.01

0.04

0.01

0.0018

0/0

1.0/1.0

0/0

The main spare parts of undercarriage is track link, which is made of 40Mn2 steel or 35MnB steel and plays the role of connecting the track shoes and transmitting power. For the normal Excavator track link, it's made of 40Mn2, but for the Bulldozer or Excavator which working in a serious environment, use 35MnBH steel to make the track link will be the first choice. The physical property is as following.

Grain Size	Hot Upset	End Hardenability HRC			Mechanical Properties
	C.H.T	J1.5	J8	J19	Yield Strength	Tensile Strength	Elongation	Cross-sectional Area Reduction	U-shaped impact
					ReL/Rp0.2	Pm	A	Z	KU2
					(Mpa)	(Mpa)	(%)	(%)	(J)
8	Qualified	56	54	32	835	945	20	64	136

All the oil track link and other high-quality track links manufactured by YINTAI are made of 35MnBH steel bar, this makes our track link have good combination mechanical properties and maximize the life span of each component and minimize production cost per hour.

Forged steel products are known for their unique characteristics and advantages over other manufacturing methods. Here are some key characteristics of forged steel products:

Strength and Durability: Forged steel products exhibit exceptional strength and durability. The forging process involves applying compressive forces to shape the metal, resulting in refined grain structure and improved mechanical properties. This makes forged steel products highly resistant to impact, fatigue, and wear, making them suitable for demanding applications that require strength and long-term reliability.

Improved Metallurgical Properties: Through the forging process, the internal grain structure of the steel is aligned, which enhances the mechanical properties of the material. It improves the toughness, tensile strength, and overall structural integrity of the product. The controlled heating and cooling during forging also allow for the removal of impurities, resulting in a cleaner and more homogeneous material.

Customizability: Forged steel products offer excellent customizability in terms of size, shape, and design. The forging process allows complex shapes and intricate details to be formed accurately, providing versatility in creating components for various industries. Customized forged products can be tailored to meet specific performance requirements and integrate seamlessly into existing systems or machinery.

Good Fatigue Resistance: Due to the refined grain structure and aligned fibers, forged steel products exhibit superior fatigue resistance. They can withstand repeated loading and high-stress conditions without experiencing premature failure. This makes forged steel components suitable for applications where cyclic loading or dynamic forces are involved, such as automotive parts, machinery components, and aircraft landing gears.

Improved Material Integrity: Forged steel products have a higher level of material integrity compared to cast or machined parts. During the forging process, the superior metallurgical properties enable the steel to maintain its chemical composition and mechanical properties consistently throughout the product. This results in a product with fewer defects, such as voids, porosity, or inclusions, which can weaken the material and compromise its performance.

Cost-Effectiveness: While the initial production costs of forging may be higher compared to other manufacturing processes, forged steel products often offer long-term cost savings. Their durability and resistance to wear and deformation reduce the need for frequent replacements and maintenance. Additionally, the superior mechanical properties can result in improved performance and efficiency, contributing to overall cost-effectiveness.

Overall, forged steel products are valued for their strength, durability, customizability, fatigue resistance, material integrity, and cost-effectiveness. These characteristics make them preferred options for demanding applications, where reliability and performance under extreme conditions are crucial.

YinTai is specialized in the complete set of bulldozer and excavator spare parts,including track chain,track Shoe,track roller,idler,sprocket,etc.We won good reputation around the world.Trustworthy. Welcome to consult!

Compared with the casting, the shell body of the forged idler has a more uniform structure, better density, better strength integrity, better dimensional characteristics, and smaller dimensional error. The directional structure has higher performance in overall strength and application capability than the casting.



High Strength



Hot forging promotes the refinement of crystallization and grain, maximizing the material strength and consistency and reducing variation between forgings. The granular flow precisely flows along the shell body contour. These continuous streamlines are conducive to reducing the incidence of fatigue or common failures.



The Reliability



One of the most important advantages of forgings is that they can meet the requirements of the designed structure.



The Structural Integrity



Forging eliminates internal flaws and produces a coherent and uniform metallurgical structure assuring optimum performance. Where stress and corrosion problems of crystals are serious, forgings can ensure long service life and problems free service.



The Uniformity



The application of rolling forging technology makes the uniformity of the front Idler dimension. Dimensional uniformity of closed-die forging results in positive control of critical wall thickness, eliminating deficiencies caused by shifted core in castings. High quality and no separation of steel ingot can eliminate internal flaws and produce a coherent and uniform metallurgical structure. The fatigue strength of creep is three times higher than that of casting.

Now more and more new technologies used in Excavator and Bulldozer spare parts manufacture, for example: the friction welding. It has been used in track roller for many years and we are a expert in this area.

Friction welding is a solid-state joining process, which could achieve reliable solder joints and create high-quality, high-strength joints with low distortion. These prolong the working life of the track rollers.

The friction welding track roller has many advantages. In friction welding, the welding allowance of the weldment and the welding power are small, the assembly requirements of the weld are not high, and the electric energy is saved, it is environmentally friendly. Because of high productivity and good quality, it has been widely applied in track roller manufacture.

Why does the friction-welding track roller be better in the wear-resistance and have a longer working lifetime?

Firstly, consumption of raw material: the roller bodies of traditional track roller are connected by the welding rod. but the friction ones are connected by the friction between rollers bodies. So the friction-welding roller will be added more raw material to make sure the roller is perfect to the standard size after welding.

Secondly, inner parts: For the traditional rollers, the welding is done after two processes of maching, so the size of the inner parts are not so precise as friction-welding ones. For the fricion-welding ones, after the weilding, there is one more precise maching with concentric locating to make sure the conformity of inner size,this means the inner parts are more precise with higher standard.

We believe in that there will be more and more new advanced technologies used in Excavator and Bulldozer spare parts manufacture in the future. Our parts will be more stable and have a longer working life. Our durable parts make it possible for your machines to deliver the performance you demand. Protect your investment by always choosing our genuine parts.

Undercarriage parts have a huge effect on working performance and walking performance of excavator. Maintenance is a key to walking speed of excavator. How to maintain your “undercarriage parts”? There are some tips as following.



1. Carrier Roller is above the track frame. The function is to carry and keep the track moving in a straight line. If Carrier Roller has a breakdown, Track Link will not work properly. Carrier Roller is added lubricating oil at once. If oil spills occur, you will have to replace this part. Therefore, you should keep the track frame clean. Don’t let the accumulation of dirt and gravel hamper its work.



2. Front Idler is in the front of the track frame. The function is to prop the track up and guide the track to wind correctly. Besides, Front Idler and Track Adjuster work together to maintain a certain degree of tension on the track. So during working and walking, should keep Front Idler running ahead, which can avoid the wear of the track. Meanwhile, Track Adjuster can reduce the vibration and shedding of the track during walking.

4. During working, Track Roller can’t be immersed in mud for a long time. After working, should support the track on one side. Then, Drive walking motor to get rid of dirt and gravel. In winter, should keep Track Roller dry because there is a floating seal between the outer roller of Track Roller and the shaft. If there is water, it will freeze at night. When the excavator is walking the next day, the floating seal is in contact with ice to cause oil spill. When Track roller is damaged, can cause many faults, such as walking deviation, walking weakness and so on.

5. The track motor guard can protect the motor. However, the dirt and gravel also can enter the interior, which making the oil tube of the motor wear out. Moisture in the dirt will corrode the joint of the oil tube, so regularly open the guard and clean up the dirt inside.

Maintaining the oil track link for a bulldozer involves several steps. Here's a general guide on how to perform maintenance on the track link:

1. Clean the Track Link: Start by removing any dirt, debris, or mud that has accumulated on the track link. Use a high-pressure water hose or a pressure washer to wash away the grime. Ensure that the track link is thoroughly cleaned before proceeding to the next steps.

2. Inspect for Damage: Carefully inspect the track link for any signs of damage, such as cracks, excessive wear, or loose components. Look for any bent or broken track links. If any issues are identified, they should be addressed promptly by replacing or repairing the damaged parts.

3. Lubricate the Track Link: Apply a suitable lubricant or oil specifically designed for the track link. Most bulldozer track links have oil seals and lubricating points. Follow the manufacturer's recommendations regarding the type of lubricant to use and the lubrication intervals. Apply the lubricant evenly to all moving parts of the track link, such as pins, bushings, and rollers.

4. Check Tension and Alignment: Ensure that the track link is properly tensioned and aligned. Too loose or too tight track links can lead to premature wear and reduce machine efficiency. Refer to the bulldozer's manual for the recommended tension specifications, and adjust the track link accordingly.

5. Monitor Wear: Regularly monitor the wear of the track link components. Pay attention to the condition of the track shoes, rollers, and sprockets. Excessive wear may indicate the need for replacement and should be addressed promptly.

6. Track Link Adjustment: If the track link becomes too loose during operation, it will affect the machine's performance and increase the risk of damage. Regularly check the track link for proper tension and make adjustments if necessary. Follow the instructions provided in the bulldozer's manual for adjusting the track link tension.

7. Regular Inspections: Perform routine inspections of the track link and other undercarriage components to identify any potential issues early. This includes checking for loose or damaged bolts, abnormal wear patterns, and oil leaks. Promptly address any problems found during the inspections.

Remember to consult the specific maintenance guidelines provided by the bulldozer's manufacturer for detailed instructions and recommendations tailored to your machine. Adhering to regular maintenance schedules and best practices will help ensure the optimal performance and longevity of the bulldozer's track link.

Introduction

In the heavy machinery industry, excavators play a crucial role in construction, mining, and earthmoving projects. To maintain peak efficiency and longevity, high-quality undercarriage components are essential. Among these, Bottom Track Rollers, Sprockets and Segments, and Ground Engaging Tools (GET) significantly impact an excavator’s performance, durability, and operational costs.

In this article, we will explore how these key components contribute to the efficiency of excavators, why high-quality materials and precision engineering matter, and how choosing the right supplier can enhance your machine’s productivity and lifespan.

1. Bottom Track Rollers: The Foundation of a Reliable Undercarriage

Bottom track rollers, also known as lower rollers, are vital components in an excavator’s undercarriage system. These rollers support the weight of the machine and ensure smooth movement across different terrains.

Key Benefits of High-Quality Bottom Track Rollers:

• Enhanced Durability – Made from hardened steel and treated with heat-resistant coatings, premium track rollers withstand extreme working conditions.

• Reduced Wear and Tear – Precision engineering reduces friction and wear, extending the service life of both the rollers and the track chain.

• Better Load Distribution – Properly designed rollers evenly distribute machine weight, minimizing stress on the undercarriage.

Signs of Worn-Out Track Rollers:

• Excessive noise and vibration during operation.

• Uneven track tension leading to misalignment.

• Visible cracks, dents, or flattening of the roller surface.

2. Sprockets and Segments: Power Transmission for Optimal Performance

Sprockets and segments play a critical role in transferring power from the engine to the tracks, driving the excavator forward with precision.

Why High-Quality Sprockets Matter:

• Superior Material Strength – Forged and heat-treated materials increase wear resistance and toughness.

• Extended Track Life – Properly matched sprockets minimize stress on track links, reducing premature failure.

• Improved Efficiency – Well-designed sprockets reduce energy loss and enhance fuel efficiency.

When to Replace Your Sprockets and Segments:

• Worn-out or hooked teeth.

• Uneven wear on the track links.

• Decreased machine performance or track slippage.

3. Ground Engaging Tools (GET): Maximizing Digging Efficiency

Ground Engaging Tools (GET) are the front-line components of an excavator that directly interact with soil, rock, and other materials. These include bucket teeth, cutting edges, rippers, and shanks.

Benefits of High-Quality Ground Engaging Tools:

• Enhanced Productivity – Sharper, durable GET components increase digging efficiency and penetration.

• Lower Operating Costs – Tougher materials reduce frequent replacements, cutting downtime and expenses.

• Improved Safety – Well-maintained GET ensures smooth operation, reducing stress on the machine and operator.

Common Signs of Worn-Out GET:

• Blunt or broken bucket teeth.

• Uneven cutting edges.

• Reduced digging performance and increased fuel consumption.

Choosing the Right Supplier for Excavator Parts

Not all excavator parts are created equal. Choosing a reliable supplier ensures you receive high-quality components that extend machine lifespan, reduce maintenance costs, and improve productivity.

At Yint Parts, we specialize in manufacturing premium Bottom Track Rollers, Sprockets and Segments, and Ground Engaging Tools designed for superior performance in demanding conditions. Our products are made using advanced materials and cutting-edge manufacturing techniques, ensuring durability, reliability, and cost-effectiveness.

Why Choose Yint Parts?

✅ High-Quality Materials – Precision-engineered with industry-leading materials. ✅ Strict Quality Control – Rigorous testing ensures durability and performance. ✅ Wide Compatibility – Designed to fit various excavator brands and models. ✅ Competitive Pricing – High-value products at cost-effective rates.

Conclusion: Invest in Quality for Long-Term Excavator Performance

Ensuring your excavator is equipped with durable and high-performing Bottom Track Rollers, Sprockets and Segments, and Ground Engaging Tools is crucial for maximizing productivity and reducing operational costs. Regular inspections, timely replacements, and sourcing from a trusted supplier like Yint Parts will keep your machines running smoothly and efficiently.

Hardening: Heat treatment techniques such as quenching and tempering can be used to increase the hardness and strength of steel. This is particularly beneficial for components that require high wear resistance, such as cutting tools, gears, and bearings.

Annealing: Annealing involves heating the steel to a specific temperature and then slowly cooling it to soften the material and relieve internal stresses. It improves the machinability, ductility, and toughness of the steel. Annealing is commonly used for components that need to be easily formed or welded, such as sheet metal, rods, and wire.

Stress Relief: Welded or mechanically processed steel components often develop residual stresses that can lead to distortion or reduced mechanical properties. Heat treatment can help relieve these stresses, enhancing the dimensional stability and preventing failures.

Transformation of Microstructure: Heat treatment alters the microstructure of steel, which directly influences its mechanical properties. Processes like quenching, tempering, and austenitizing cause phase transformations that result in desired structures such as martensite, pearlite, or bainite. This, in turn, affects the material's hardness, strength, toughness, and ductility.

Case Hardening: Case hardening treatments like carburizing and nitriding create a hard, wear-resistant surface layer on the steel while retaining the toughness of the core. This is useful for applications where resistance to wear, fatigue, and surface contact is necessary, such as gears, shafts, and camshafts.

Dimensional Stability: Heat treatment can help improve the dimensional stability of steel components, reducing the risk of distortion or dimensional changes that may occur during subsequent machining or usage.

Grain Refinement: Heat treatment can refine the grain structure of steel, resulting in finer grains. This can enhance the material's strength, toughness, and fatigue resistance, particularly in high-stress applications.

It's important to note that the specific heat treatment process and parameters depend on the type of steel, desired properties, and intended application of the final product. Skilled heat treatment practitioners follow established standards, procedures, and control measures to ensure consistent and reliable results in the treated steel products.

YinTai is specialized in the complete set of bulldozer and excavator spare parts,including track chain,track Shoe,track roller,idler,sprocket,etc.We won good reputation around the world.Trustworthy. Welcome to consult!

Track-chain tension adjustment is the most controllable factor in undercarriage wear life. The accurate track sag of many crawler machines is 2 inches. Due to the complicated ground conditions, Track tension changes with many variations. You should clean out your tracks in daily life.

Cleaning track: Remove out between the track and the roller frame with a shovel, preferably when the packed

material is still wet.

During working, stuck and packed materials between mating components such as rollers, links, sprocket teeth, and bushings improve track tension degree. So tension needs to be adjusted any time packing in the track chain changes.

When crawl machines go along, it should tighten the track up, so getting them cleaned out and adjusted is the important point to undercarriage life.

To measure track-chain tension:

* Roll the machine forward slowly and allow it to roll to a stop.

* Center a track pin over the carrier roller.

* Lay a straightedge or stretch a string over the track grousers.

* Measure sag between the straight edge and grouser tip where the track sags the lowest.

The track adjuster is a grease-filled hydraulic cylinder used to maintain track tension. To adjust track tension, add grease or remove grease from the track adjuster. Eliminating pitch extension, or chain stretch slows sprocket tooth wear and bushing outside-diameter wear.

The excavator track chain, also known as the track link assembly, is a vital component in an excavator’s undercarriage. Its primary functions are closely related to those of track chains in general for tracked vehicles, but with specific considerations for excavators. Here are the main functions of the excavator track chain:



Weight Distribution and Stability:

Like other track chains, the excavator track chain helps distribute the machine’s weight over a larger surface area. This is crucial for preventing the excavator from sinking into soft or uneven terrain and contributes to overall stability during operation.



Traction and Mobility:

The excavator track chain provides traction, enabling the excavator to move efficiently across various terrains. It is particularly important in excavation sites where the ground may be uneven or consist of loose soil, rocks, or other challenging conditions.



Support for the Track Shoes:

The track chain supports the track shoes, which are the components that come into direct contact with the ground. The track shoes help to further distribute the weight of the excavator and provide additional traction.



Durability and Resistance to Wear:

Excavators are subjected to demanding working conditions, and the track chain is designed to be durable and resistant to wear. It must withstand the stress and abrasion associated with digging, loading, and maneuvering in harsh environments.



Ease of Maintenance:

Excavator track chains are designed to be easily maintained. Regular inspection, lubrication, and replacement of worn components are essential to ensure optimal performance and longevity of the undercarriage.



Adjustability:

Some excavators are equipped with an adjustable track tensioning system. This allows operators to adjust the tension in the track chain, ensuring proper track alignment and minimizing premature wear on components.



Smooth Operation:

A well-maintained and properly tensioned track chain contributes to the smooth operation of the excavator. It allows for precise control during digging, lifting, and other tasks, enhancing the overall efficiency of the machine.

In summary, the excavator track chain is a critical component that supports the excavator's weight, provides traction, and contributes to the machine's stability and mobility. Regular maintenance and proper tensioning are essential for ensuring the longevity and optimal performance of the excavator's undercarriage.

YinTai offers many types of track links and offer customized products. We use advanced machining center, horizontal and vertical CNC machining, heat-treatment equipment to execute processes. OEM standard! binochen@yintparts.com