Swing Bearing PC100-5 PC120-5 PC130-5 PN 203-25-51200

Ensure smooth and reliable rotation for your Komatsu excavator with this genuine Lucas Parts stock swing bearing (also called a slew bearing or slewing ring). Designed for durability and precision, this bearing reduces wear and extends the lifespan of your machine’s rotation system.

Key Features:

✅ OEM-Compatible Replacement – Exact fit for Komatsu PC100-5
✅ Part Number:  203-25-51200
✅ High Load Capacity – Supports heavy-duty excavator movements
✅ Smooth Operation – Precision-engineered for minimal friction
✅ Corrosion-Resistant – Built for tough job site conditions

Applications:

• Komatsu PC100-5, PC100-5C, PC100-5Z, PC100L-5, PC120-5, PC120-5K, PC120-5Z, PC130-5, PC130-5K, PC150HD-5K, PC150NHD-5K

• Excavator turntable rotation systems

• Slewing drive mechanisms

Why Choose This Swing Bearing?

✔ Perfect Fit – No modifications needed
✔ Long Service Life – Robust steel construction
✔ Reduces Downtime – Reliable performance under load

A slew bearing (also known as a slewing ring/swing bearing/turntable bearing) is a type of rotational rolling-element bearing designed to handle heavy, slow-turning, or slowly oscillating loads. It supports combined load types—axial, radial, and moment loads—making it ideal for applications such as cranes, swing yarders, and the yaw mechanisms of horizontal-axis wind turbines, where it enables smooth rotation of horizontal platforms.

Lucas Parts slew bearings are engineered to handle heavy radial, thrust, and moment loads, with configurations available in non-gear or external gear designs. Backed by extensive expertise, our Swing Bearing delivers high-quality, custom-engineered slew bearings tailored to meet the precise demands of your applications.
Procedure for Inspecting Excavator Slewing Bearing Condition

To ensure safe and accurate inspection of the slewing bearing during excavator construction or maintenance, follow these steps:

    Preparation & Positioning

1. Preparation & Positioning

   • Park the excavator on level ground, away from dust and debris.

   • Lower the front-end working device completely to the ground.

2. Safety Check

   • Clear the surrounding area of obstacles, obstructions, and unauthorized personnel to prevent accidents.

   • Verify that no potential hazards exist before proceeding.

3. Dial Indicator Setup

   • Secure the dial indicator frame to the lower frame.

   • Position the detection point approximately 20mm from the slewing seat ring.

4. Pre-Test Calibration

   • Reset the dial indicator to zero.

   • Fully extend the stick and retract the bucket to ensure proper alignment.

5. Measurement Process

   • Lower the bucket to the ground and raise the track 15-30cm above the surface.

   • Monitor the dial indicator and record three separate readings for accuracy.

Note: Variations in dial gauge positioning may affect measurements. Multiple recordings ensure data reliability and consistency.