What’s The Major Crawler Parts Of A Crane?

Cranes are essential heavy machinery used in construction, mining, and various other industries. Among the different types of cranes, crawler cranes provide exceptional stability and mobility on rough terrain. These cranes rely on a set of major crawler parts of a crane to ensure smooth operation. 

The crawler parts of a crane can be divided into multiple components based on their specific functions and roles within the crawler crane undercarriage. Here are the main divisions or categories of crawler crane parts:

crawler Track parts of a crane

The track parts of a crane are an integral part of a crawler crane undercarriage system and play a crucial role in supporting the crane’s weight, enabling movement, and providing traction. The track components include track rollers, track shoes, and track chains.

crawler crane track roller

Crawler crane track rollers are cylindrical components positioned along the crawler crane undercarriage. They are typically made of durable materials such as steel and are designed to withstand heavy loads and harsh operating conditions. The primary function of track rollers is to support the weight of the crane and ensure smooth movement along the tracks.

Each crawler crane track roller consists of an outer shell, which houses a set of bearings or bushings. The bearings or bushings allow the track roller to rotate freely as the crane moves. The number and arrangement of track rollers depend on the crane’s size and design.

The track rollers are strategically placed along the undercarriage to distribute the weight of the crane evenly. By reducing friction and evenly distributing the load, crawler crane track rollers contribute to the stability, smooth operation, and longevity of the crane.

crawler crane track shoes

Crawler crane track shoes, also known as track pads or track plates, are large metal plates that make direct contact with the ground. They are positioned on the bottom of the track assembly and provide traction for the crane’s movement.

Track shoes are available in various designs and materials to suit different applications and ground conditions. Common materials for track shoes include rubber and steel. Rubber track shoes are ideal for working on delicate surfaces, as they minimize damage and reduce noise. Steel track shoes offer durability and are suitable for rugged terrains with high abrasion.

The design of crawler crane track shoes may vary depending on the crane’s weight and the intended application. They may feature cleats, lugs, or other tread patterns to enhance traction and prevent slippage.

Crawler crane track shoes distribute the weight of the crane across a larger surface area, reducing the ground pressure exerted by the crane. This helps prevent the crane from sinking into soft ground and provides stability during operation.

Crawler crane Track Chains

Crawler crane track chains, also known as track links, connect the track shoes in a continuous loop, forming the crawler mechanism. They play a crucial role in transmitting power from the crane’s engine to the tracks, enabling the crane to move forward or backward.

Crawler crane track chains are constructed using durable steel links that are interconnected by pins and bushings. The links articulate and flex as the crane moves along the tracks. The pins and bushings provide smooth movement and allow the track chains to withstand the heavy loads and stresses encountered during crane operation.

crawler Tensioning parts of a crane

Tensioning components in a crawler crane undercarriage system are responsible for maintaining proper tension in the track chains. These components ensure optimal alignment, reduce slack, and prevent excessive wear or damage. The main tensioning components include idler gears and tensioning mechanisms.

crawler crane idler gear

Crawler crane idler gears are located at the front and rear of the undercarriage and play a vital role in guiding the track chains. They help maintain tension within the system and ensure proper alignment of the track chains.

Idler gears as a parts of a crane, are typically positioned in a fixed position, and their primary function is to guide the track chains as they move along the undercarriage. The track chains pass over the idler gears, which help distribute the load evenly and minimize slack. By reducing slack and maintaining tension, crawler crane idler gears contribute to the stability and smooth operation of the crawler crane undercarriage.

Idler gears are often adjustable to allow for fine-tuning of the tension. This adjustability is crucial as the tension requirements may vary based on the working conditions or the wear of the undercarriage components. By adjusting the position of the crawler crane idler gears, operators can optimize the tension in the track chains for optimal performance and longevity.

Idler gears are typically equipped with sealed bearings to prevent contamination from dirt, debris, or moisture. Sealed bearings ensure smooth rotation and reduce the need for frequent maintenance.

Crawler Crane Tensioning Mechanisms

Crawer crane tensioning mechanisms are used to adjust and control the tension in the track chains. These mechanisms can vary depending on the crane’s design and manufacturer. They may include spring tensioners or hydraulic cylinders that apply pressure to the idler gears or other tensioning points, ensuring optimal tension for proper track chain operation. Tensioning mechanisms are essential for maintaining the integrity of the undercarriage system and preventing excessive wear or damage.

crawler Power Transmission parts of a crane

Power transmission components in a crane are responsible for transferring power from the engine or motor to various parts of the crane, enabling it to perform its lifting and movement functions. These components include sprocket and drive motors.

Crawler crane sprocket

Crawler crane sprockets are toothed wheels located at each end of the crawler crane undercarriage. They engage with the track chains and transfer power from the crane’s engine to the tracks. As the crawler crane sprockets rotate, they drive the track chains, propelling the crane forward or backward. Sprockets are constructed from durable materials, such as hardened steel, to withstand heavy loads and resist wear. Properly aligned and well-maintained sprockets ensure efficient power transmission and contribute to the crane’s overall performance.

Drive Motors

Drive motors are responsible for generating power and driving the crawler crane sprockets. These motors are typically located within the crane’s upper structure and are connected to the undercarriage through a system of gears and driveshafts. Drive motors provide the necessary torque to rotate the sprockets, enabling the crane’s movement along the tracks. The power output of the drive motors is directly proportional to the crane’s lifting capacity and speed.

crawler Support and Stabilization parts of a crane

Support and stabilization components in a crawler crane are responsible for providing stability, balance, and safety during lifting operations. These components are designed to counteract the crane’s weight and the loads being lifted, ensuring that the crane remains steady and secure. The main support and stabilization components in a crawler crane include frame structure and stabilizer legs.

Frame Structure

 The frame structure of a crawler crane’s undercarriage serves as the main support for the entire crane. It provides a rigid and robust framework that holds all the undercarriage components together. The frame structure is designed to withstand the crane’s weight, as well as the forces and stresses encountered during lifting operations.

Stabilizer Legs

Stabilizer legs, also known as outriggers, are extendable legs that provide additional stability to the crane during lifting operations. They are typically located on the sides of the crane’s upper structure and can be deployed to increase the crane’s footprint and distribute the load over a larger area. Stabilizer legs are equipped with pads or floats to prevent sinking into soft or uneven surfaces. They play a crucial role in maintaining the crane’s stability and preventing tipping or excessive swaying.

crawler Lubrication and Maintenance parts of a crane

Lubrication and maintenance components in a crawler crane are crucial for ensuring proper functioning, minimizing wear and tear, and maximizing the lifespan of various mechanical parts. These components include filters and seals.

crawler crane filters

Crawler crane filters are essential components in a crane’s maintenance system as they help remove contaminants from fluids, such as oil or hydraulic fluid. Contaminants can include dirt, debris, metal particles, and other impurities that can accelerate wear and damage to components.

Common types of crawler crane filters used in cranes include oil filters, fuel filters, air filters, and hydraulic filters. These filters are designed to capture and retain particles while allowing the clean fluid or air to pass through. Regular inspection and replacement of filters are necessary to maintain their effectiveness and prevent contaminants from circulating within the crane’s systems.

crawler crane Seals

Crawler crane seals are crucial components that prevent the leakage of fluids or contaminants and maintain the integrity of various crane systems. They are typically made of rubber or other materials and are used in areas where two components join or move relative to each other.

Seals are commonly found in hydraulic cylinders, gearboxes, bearings, and other rotating or moving parts. They prevent fluid leakage, protect against dust and debris ingress, and maintain the lubrication within the system. Regular inspection and replacement of worn or damaged seals are essential to prevent leaks and maintain the crane’s performance.


In conclusion, the major crawler parts of a crane are essential components that contribute to the crane’s stability, mobility, and lifting capacity. These parts of a crane, including the crawler tracks, drive sprockets, and track rollers, enable the crane to maneuver over various terrains and distribute weight effectively. The crawler crane parts provide traction, support, and smooth movement, ensuring safe and efficient operation. Regular maintenance and inspection of these parts are crucial to ensure their optimal performance and reliability. The crawler parts of a crane play a pivotal role in the overall functionality and performance of the machine.


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Crawler Crane Undercarriage Parts