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Hello everyone, I am a professional undercarriage parts manufacturer, specializing in the production of excavator track rollers and bulldozer track rollers for over a decade. Many customers ask: “What if the track roller size doesn’t match? After replacement, it still wobbles or leaks oil?” Today, I’ll share a real client measurement experience to show you exactly how to measure the key dimensions of an excavator track roller and why precision is absolutely critical.

Not long ago, a client working in mining engineering urgently contacted us: His excavator’s track was making serious abnormal noises, and the old track rollers were severely worn. He needed a new set of excavator track rollers as soon as possible. He sent us the machine model and photos of the old parts. After verifying the main installation dimensions and other key data, we provided him with our track roller drawings and asked him to mark any required adjustments directly on the drawings. We then custom-produced the new track rollers according to his specifications. Before shipping, we conducted a full dimensional measurement and verification for the client.

Here are the key measurement items from that time, along with on-site photos:

1. Track Roller Body Outer Diameter (Tread / Working Surface Diameter) This is the most critical dimension of the track roller, directly determining track contact fit and load-bearing capacity.

2. Flange Outer Diameter The inner and outer flanges provide lateral guidance to prevent track deviation and derailment.

3. Bottom Roller Width

The width directly affects the contact area with the track and overall stability.

4. Track Roller Shaft Diameter

This dimension directly impacts load-bearing capacity, bending resistance, fatigue life, bearing fit stability, and ultimately the service life of the roller.

5. Mounting Hole Spacing

This determines whether the track roller can be installed. Precise accuracy in this dimension ensures proper alignment, secure fastening, and long-term reliability of the entire undercarriage system.

6. Other Key Dimensions (shaft end length, bolt hole diameter, etc.)

Why must dimensions be measured so precisely?

• A deviation of just 0.5 mm can cause track jumping, uneven wear, or early failure of the bottom roller.
• A deviation of 1 mm or more increases overall machine vibration, causes rapid seal damage, and doubles maintenance costs.
• A precisely matched excavator track roller (bottom roller) can extend service life by 30%–50%.

Our factory measures thousands of customer samples every year and has built a dimensional database covering hundreds of mainstream brands. Simply provide your machine model, old part photos, or send us the sample directly — we can recommend and supply perfectly adapted bottom rollers for you.

If you’re also struggling with excavator bottom roller (track roller) size matching issues, feel free to contact us anytime!