Excavator chain links, also known as track chains, are an essential component of the undercarriage system in hydraulic excavators. They form the continuous track loop that enables the excavator to move and operate on various terrains. The excavator chain links are typically made of high-strength steel and are designed to withstand the heavy loads and harsh conditions encountered during excavation and earthmoving tasks.
Each excavator chain link consists of several interconnected components, including:
1. Track Shoes: These are the plates that come into contact with the ground surface and provide traction and stability. They are usually made of durable steel and can be configured with various profiles, such as flat or triple grouser, to suit different soil conditions.
2. Link Pins: Link pins connect adjacent track shoes and allow them to pivot and move relative to each other. They are inserted through holes in the track shoes and secured with cotter pins or other locking mechanisms.
3. Bushings: Bushings are cylindrical metal sleeves that fit inside the link holes of the track shoes. They provide support and allow the link pins to rotate smoothly, reducing friction and wear.
4. Seals: Seals are installed within the track links to prevent dirt, debris, and moisture from entering the internal components. They help to maintain the lubrication and extend the lifespan of the link pins and bushings.
5. Rollers: While not part of the chain links themselves, the excavator's undercarriage system also includes rollers that support the track chain. These rollers guide and distribute the weight of the excavator, reducing friction and enabling smooth track movement.
Excavator chain links undergo significant stress and wear during operation, especially when working in demanding conditions. Regular maintenance, including lubrication, inspection, and replacement of worn components, is crucial to ensure optimal performance and extend the lifespan of the chain links.
Two types of excavator chain links
There are primarily two types of excavator chain links commonly used in hydraulic excavators: sealed and lubricated track (SALT) chains and dry chains.
1. Sealed and Lubricated Track (SALT) Chains:
SALT chains, as the name suggests, feature a sealed design that contains lubricating oil within the chain assembly. These chains are commonly used in modern hydraulic excavators due to their enhanced durability and reduced maintenance requirements. The key components of SALT chains include:
- Sealed Track Shoes: SALT chains utilize track shoes with built-in seals to retain lubricant and prevent contaminants from entering the chain assembly. These track shoes often have a larger surface area to increase contact with the ground and improve traction.
- Lubricated Bushings: SALT chains incorporate bushings with lubrication reservoirs that continuously supply oil to the link pins and bushings. This lubrication reduces friction, wear, and heat generation within the chain assembly.
- Sealed Link Pins: The link pins in SALT chains are designed with seals to prevent lubricant leakage and maintain the oil within the chain assembly.
SALT chains offer several advantages, including extended chain life, reduced internal wear, improved performance in harsh conditions, and decreased maintenance requirements. However, they can be more expensive upfront due to the additional sealing and lubrication features.
2. Dry Chains:
Dry chains, also known as traditional chains, do not incorporate a sealed design or built-in lubrication system. These chains have been used in older excavator models and are still utilized in certain applications. The key features of dry chains include:
- Dry Track Shoes: Dry chains use standard track shoes without built-in seals or lubrication features. These track shoes are typically made of durable steel and can be configured with different profiles to suit specific working conditions.
- Lubrication Maintenance: Dry chains require regular manual lubrication of the link pins and bushings to reduce friction and prevent excessive wear. Lubrication intervals may vary depending on the manufacturer's recommendations and operating conditions.
- Open Link Pins: The link pins in dry chains do not have built-in seals and rely on external lubrication to minimize wear.
Dry chains are generally more economical upfront but require more frequent maintenance and lubrication to ensure optimal performance and longevity.
The choice between SALT chains and dry chains depends on factors such as the excavator model, operating conditions, maintenance preferences, and budget considerations. It is important to consult the excavator manufacturer's recommendations and follow proper maintenance practices to maximize the lifespan and performance of the chosen chain type.
Price range of excavator chain links
The price range of excavator chain links can vary depending on several factors, including the excavator model, chain type, manufacturer, size, and specific configuration. Additionally, market conditions and regional variations can influence the pricing. Given these variables, it is challenging to provide exact price ranges. However, I can provide a general idea of the relative cost differences between the two types of excavator chain links:
1. Sealed and Lubricated Track (SALT) Chains:
SALT chains generally come with a higher initial cost compared to dry chains. The additional sealing and lubrication features incorporated into SALT chains contribute to their enhanced durability, reduced maintenance requirements, and improved performance, which can result in a higher price range.
2. Dry Chains:
Dry chains, being the more traditional and simpler design, tend to have a lower initial cost compared to SALT chains. However, they require regular manual lubrication and more frequent maintenance, which can add to the overall operational costs over time.
It's important to note that the prices of excavator chain links can vary significantly depending on the specific requirements of the excavator model and the supplier or distributor from which they are purchased. To obtain accurate and up-to-date pricing information, it is recommended to contact authorizedmanufacturers, or excavator parts suppliers specializing in excavator parts and undercarriage components. They can provide detailed cost estimates based on your specific needs and the current market conditions.
