How to Check Swing Bearing on an Excavator: A Step-by-Step Guide

The swing bearing is the heart of your excavator’s rotation. A faulty bearing leads to excessive play, strange noises, and costly downtime. This guide provides a clear, professional method for a preliminary inspection to catch issues early.

Pre-Inspection Safety and Preparation

Before starting, ensure the machine is on level ground with the bucket lowered. Engage the parking brake and lock all controls. You will need basic tools, a flashlight, and a notepad to record findings.

Visual Inspection for Obvious Damage

Begin by thoroughly cleaning the bearing’s exterior. Look for visible cracks, dents, or severe rust on the bearing raceway and mounting bolts. Check for signs of seal failure, such as grease leakage or contamination ingress, which is a primary failure indicator.

Checking for Axial and Radial Play

This is a critical functional test. Use a robust pry bar against the upper structure (house) and the undercarriage (carbody). Apply force to check for movement. Any significant rocking or lurching indicates excessive internal wear. Precise measurement requires dial indicators, but noticeable free play warrants professional evaluation.

Listening and Feeling During Operation

Operate the excavator slowly in a safe, clear area. Listen for grinding, clicking, or rumbling sounds during the swing. Feel for any hesitation, uneven rotation, or binding. These operational symptoms often confirm visual and physical inspection findings.

Common Swing Bearing Issues and Next Steps

Common problems include pitting from contamination, brinelling from shock loads, and raceway wear. If your check reveals any of the issues above, it’s time for a detailed assessment. For a comprehensive diagnostic procedure, you can follow this detailed guide on how to check swing bearing on excavator.

When to Call a Professional

If you detect play, severe noise, or visible damage, cease operation. Swinging with a damaged bearing risks catastrophic failure. Consult a certified technician for a definitive diagnosis and discuss repair or replacement options.

Ready to ensure your excavator’s longevity? Schedule a professional inspection today to prevent unexpected breakdowns and maintain peak operational efficiency.