Crawler Undercarriage

Product Specifications

Technical details and manufacturing context for Crawler Undercarriage

Definition

The crawler undercarriage is the foundational structural component of a crawler crane, consisting of a robust frame, track assemblies, drive sprockets, idlers, rollers, and suspension system. It distributes the crane's weight over a large ground contact area, enabling operation on soft or uneven terrain while providing the necessary traction and stability for lifting operations. The undercarriage is typically fabricated from high-strength alloy steel, wear-resistant steel plate, and forged steel components to withstand heavy loads and abrasive conditions. Key dimensional parameters include track gauge (2000–6000 mm), track width (500–1200 mm), and ground contact length (3000–8000 mm), which together influence ground pressure (0.05–0.15 MPa) and flotation. Performance specifications such as max travel speed (1.0–3.0 km/h), gradeability (30–50%), and max drawbar pull (100–500 kN) define its mobility and towing capability. The hydraulic system operates at 20–35 MPa and is designed for a temperature range of -20 to 50 °C. Electrical components are protected to IP54–IP65 (IEC 60529). Material grades may range from Q345B to Q690D (GB/T 1591) depending on load requirements. Total weight of the undercarriage alone is typically 10–100 t. These values are reference ranges; actual specifications must be confirmed with the legal manufacturer for the specific model and application. The undercarriage interfaces with the upper structure via a slewing bearing and is essential for crane stability during lifting. Regular inspection of track tension, wear on rollers and sprockets, and hydraulic integrity is critical. Failure modes include track link fatigue, roller seizure, and hydraulic leaks, which can compromise mobility and safety.

Working Principle

The undercarriage transfers the crane's load to the ground via continuous steel tracks. Hydraulic or electric motors drive sprockets that engage with the track links, propelling the crane. Track tension is maintained by idlers, while rollers support the track's upper run. The system allows for steering through differential track speed and provides a stable platform that minimizes ground pressure. The large contact area reduces ground pressure, enabling operation on soft soils. The drive system is typically hydraulic, with operating pressure of 20–35 MPa, and travel speed is limited to 1.0–3.0 km/h for safety. Gradeability of 30–50% allows operation on slopes. The undercarriage's structural integrity is vital for load distribution and stability during lifting.

Common Materials

High-strength alloy steel, Wear-resistant steel plate, Forged steel components

Technical Parameters

Parameter	Typical range	Notes & selection driver
Track Gauge	2000–6000 mm	Determines stability and transport width.
Track Width	500–1200 mm	Affects ground pressure and flotation.
Ground Contact Length	3000–8000 mm	Influences stability and traction.
Ground Pressure	0.05–0.15 MPa	Higher values risk sinking in soft soil.
Max Travel Speed	1.0–3.0 km/h	Limited by hydraulic drive and safety.
Gradeability	30–50 %	Slope capability without losing traction.
Max Drawbar Pull	100–500 kN	Critical for towing or pulling loads.
Operating Pressure	20–35 MPa	Hydraulic system pressure for drive and controls.
Operating Temperature	-20–50 °C	Outside range may affect seals and hydraulics.
Ingress Protection	IP54–IP65	Protects electrical components from dust and water.IEC 60529
Material Grade	Q345B–Q690D	Higher grades for heavier loads and wear resistance.GB/T 1591
Total Weight	10–100 t	Includes undercarriage without upper structure.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Track Frame
Main structural base that supports all other undercarriage components and connects to the crane's upper structure.

Material: High-strength welded steel
Track Assembly (Track Chain)
Continuous loop of linked track shoes that provides the running surface and traction.

Material: Alloy steel links with hardened pins/bushings
Drive Sprocket
Powered gear that meshes with the track links to propel the crane.

Material: Forged or cast alloy steel
Idler Wheel Part
Front wheel that guides the track and helps maintain track tension.

Material: Cast steel with hardened tread
Carrier Rollers
Support the upper run of the track, reducing sag and friction.

Material: Forged steel with sealed bearings
Track Rollers (Bogie Rollers) Part
Distribute the crane's weight to the track and ground, mounted on bogie assemblies for terrain compliance.

Material: Forged steel with hardened rims
Track Tensioning System
Adjusts track tension (typically via the idler) to prevent derailment and reduce wear.

Material: Steel components with hydraulic or mechanical actuator
Travel Motors
Drive the sprockets that pull the tracks.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Crawler Undercarriage.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Crawler Crane

View system integration details

Electric Rope Shovel

View system integration details

Manufacturers of Crawler Undercarriage

Manufacturer profiles associated with Crawler Undercarriage.

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Frequently Asked Questions

What is the function of a crawler undercarriage?

It provides the mobile base for a crawler crane, distributing weight over a large area to reduce ground pressure and enable travel on soft or uneven terrain. It also provides traction and stability during lifting operations.

What materials are typically used?

High-strength alloy steel, wear-resistant steel plate, and forged steel components are commonly used. Material grades may range from Q345B to Q690D per GB/T 1591, depending on load requirements.

What are the key parameters to verify?

Track gauge, track width, ground contact length, ground pressure, max travel speed, gradeability, max drawbar pull, operating pressure, operating temperature, ingress protection, material grade, and total weight. These are reference ranges; confirm with the manufacturer.

How is the undercarriage maintained?

Regular inspection of track tension, wear on rollers, sprockets, and idlers, and hydraulic system integrity is essential. Look for signs of fatigue, leaks, or abnormal wear. Follow manufacturer guidelines for maintenance intervals.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

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pressure:	N/A (mechanical system)
other spec:	Max ground pressure: 0.5-1.2 MPa, Track speed: 0-3 km/h, Gradeability: up to 30%
temperature:	-40°C to +50°C

Product Specifications

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