## How to Check Swing Bearing on Excavator: 5-Step Inspection Guide

The **swing bearing** is the heart of your excavator’s rotation system. When it fails, downtime costs thousands. This guide shows you exactly **how to check swing bearing on excavator** safely and accurately.

### Why Regular Swing Bearing Inspection Matters

The **slewing ring bearing** supports the entire upper structure while allowing 360° rotation. Worn bearings cause **excessive axial play**, gear teeth damage, and even catastrophic separation. Monthly inspections catch problems early.

### Step 1: Visual Inspection of the Swing Bearing Area

Park on level ground and lower the bucket. Inspect the **slew ring** for:

– **Grease leakage** around the seal
– **Rust streaks** or water intrusion
– Loose or missing **mounting bolts**
– Visible **cracks** in the raceway

### Step 2: Check Axial and Radial Play

This is the core of how to check swing bearing on excavator. Attach a **dial indicator** with a magnetic base to the undercarriage frame. Position the probe against the upper structure’s bearing race.

Apply lifting force with a jack and record the **axial clearance**. Compare readings to your **OEM specifications**—typically 0.5–2.0 mm depending on machine size.

### Step 3: Measure Swing Bearing Clearance with a Feeler Gauge

Insert a **feeler gauge** between the bearing race and the mounting surface at four points (90° apart). Uneven readings indicate **raceway deformation** or **uneven wear**.

### Step 4: Inspect the Swing Gear and Pinion

Remove the inspection cover and examine **gear teeth** for:

– **Pitting** or spalling
– Broken or chipped teeth
– Excessive **backlash**

### Step 5: Check Grease Condition and Bolts

Extract a grease sample. Dark, gritty grease means **internal wear**. Then torque-check all **swing bearing bolts** using a calibrated wrench.

### Frequently Asked Questions

**How often should I inspect the swing bearing?**
Every 250 operating hours or monthly for heavy use.

**What are signs of a failing swing bearing?**
Excessive play, grinding noise, vibration during swing, and grease leakage.

**Can I check the swing bearing without disassembly?**
Yes—steps 1–4 above work without removing the bearing.

### When to Call a Professional

If axial play exceeds OEM limits or you find cracked races, stop operating immediately. For a detailed walkthrough, follow this expert guide on how to check swing bearing on excavator.

### Take Action Today

Your excavator’s swing bearing won’t fail without warning—if you’re looking. Schedule inspections, log readings, and replace worn bearings before they cause costly downtime.

**Order replacement slew bearings** or download our free inspection checklist today.