How to Choose the Right Slewing Bearing for Construction Equipment Applications
What Is a Slewing Bearing?
A slewing bearing is a precision-engineered mechanical component that facilitates rotational movement between two structures. It supports axial, radial, and moment loads, and is commonly used in construction equipment such as cranes, excavators, concrete pumps, and aerial work platforms. These large-diameter bearings are critical for heavy-duty turning applications, enabling machines to rotate smoothly while managing intense loads and environmental stress.
Choosing the right slewing bearing is not just a matter of size—it requires a thorough understanding of application needs, load dynamics, environmental conditions, and product lifespan. In this article, we’ll walk you through a complete guide to selecting the best slewing bearing for construction machinery.
Key Factors When Selecting Slewing Bearings
Load Type and Magnitude
Understand whether your machine is exposed to:
Axial loads (vertical weight)
Radial loads (horizontal stress)
Overturning moment (torque from off-center loads)
For instance:
Excavators require strong moment load resistance
Tower cranes need high axial load-bearing capacity
Drilling rigs must handle both high torque and axial thrust
Use accurate force analysis or simulation data (like FEA) to determine expected load ranges.
Rotation Speed and Duty Cycle
Aerial platforms with slow, infrequent rotation require different bearings than high-speed drilling rigs or tunnel boring machines. Choose:
Ball slewing bearings for low-speed, low-friction applications
Roller slewing bearings for high-load or rotational inertia
Installation Space and Mounting Type
Assess diameter, bolt hole placement, and flange structure:
Internal gear bearings save external space
External gear allows better torque transmission
Non-gear options exist for systems using external drives
Recommended Slewing Bearing Types for Construction Equipment
Four Point Contact Ball Slewing Bearing
Excellent for cranes and work platforms
Handles combined loads efficiently
Compact and cost-effective
Double Row Ball Slewing Bearing
Supports higher axial and radial loads
Used in heavy-duty crawler cranes and drilling machines
Higher stability due to dual-row configuration
Cross Roller Slewing Bearing
High stiffness and precision
Ideal for tight installation spaces
Preferred in high-torque applications like foundation machines
Three-Row Roller Slewing Bearing
Superior load handling in all directions
Large size, heavy-duty
Suitable for bucket wheel excavators and heavy mining cranes
Environmental Considerations
Construction equipment faces harsh field conditions:
Dust and sand (grit contamination risk)
Mud and water (requires IP-rated sealing)
Temperature extremes (from -30°C to +70°C)
LDB slewing bearings are available with:
Triple lip seals
Grease ports for regular lubrication
Chrome-plated raceways for corrosion resistance
Customization and Mounting Options
Some machines require non-standard mounting holes or flange connections. LDB offers:
Custom bolt hole patterns
Split bearings for large-diameter applications
Optimized raceway geometry
Reinforced gear tooth hardening for longer service life
Typical Price Range and Procurement Tips
The price of slewing bearings for construction depends on:
Outer diameter and gear type (internal/external/no gear)
Load class and material grade
Sealing systems and certification (CE, ISO, etc.)
Typical Price Range: USD $400 – $6,000 per unit
Custom-engineered options may cost more depending on complexity and volumes.
To find a reliable manufacturer or supplier, consult technical teams and request:
2D/3D drawings
Load rating documentation
Lifetime fatigue calculation
Visit www.ldb-bearing.com for quotes and technical assistance.
Why LDB Is a Trusted Partner in the Construction Industry
LDB is a globally recognized manufacturer and supplier of slewing bearings for heavy-duty construction applications. With:
20+ years of experience
Advanced CNC production lines
Custom machining for OEM partners
Robust inventory and fast shipping options
LDB supports clients from design to delivery. Our products are used in:
Mobile and tower cranes
Tracked excavators
Earth drills and piling rigs
Material handling booms
Final Advice: Ask the Right Questions
Before placing an order, ask:
What’s the actual working load and peak load?
What’s the expected rotational speed and duty cycle?
Is environmental protection a priority?
Are maintenance intervals important?
Choosing the wrong bearing can lead to frequent breakdowns or costly repairs. LDB ensures that your slewing bearing delivers reliable, long-term performance no matter how tough the construction site.
For application-matched solutions, contact us at www.ldb-bearing.com.
