Product Overview

The Track Roller — also known as Bottom Roller or Lower Roller — is a critical load-bearing component installed under the track frame of Komatsu PC300 crawler excavators.

For a 30-ton class excavator, each track roller operates under extremely high static and dynamic loads. It supports machine weight, guides the track chain and distributes ground pressure evenly during digging, loading and travelling operations.

During operation, the roller is exposed to:

• Heavy impact loads
• Rock and gravel abrasion
• Mud and water contamination
• Continuous vibration

A worn or damaged track roller may cause:

• Track chain misalignment
• Excessive track link wear
• Increased sprocket and idler wear
• Reduced machine working efficiency

Our Komatsu PC300 track rollers are manufactured according to original dimensional requirements, providing reliable aftermarket replacement solutions for construction, mining and earthmoving applications.

Key Features & Benefits

Wide Compatibility

Designed for Komatsu PC300 crawler excavators, including:

• PC300
• PC300LC
• PC300-5
• PC300-6
• PC300-7
• PC300-8

Single & Double Flange Options

Available configurations:

• Single Flange (SF)
• Double Flange (DF)

to match different installation positions on the track frame.

Heavy-Duty Alloy Steel Construction

Manufactured from high-strength:

40Mn2 / 50Mn alloy steel

with excellent:

• Load-bearing capability
• Impact resistance
• Fatigue resistance

Advanced Heat Treatment

The roller tread surface is induction hardened:

• Surface hardness: HRC 52-58
• Hardening depth: 5mm-10mm

providing excellent wear resistance under harsh working conditions.

Reliable Floating Seal System

Equipped with:

• Heavy-duty floating oil seals
• High-quality bronze bushings
• Lifetime lubrication system

to prevent:

• Oil leakage
• Mud intrusion
• Premature bearing failure

OEM-Style Direct Replacement

Manufactured according to OEM drawings with:

• Accurate roller diameter
• Correct shaft dimensions
• Standard mounting specifications

No additional modification required.

Technical Specifications

Why Trust Our Undercarriage Solutions?

For a 30-ton class excavator like Komatsu PC300, undercarriage components represent a major maintenance cost. High-quality track rollers directly affect machine stability, travelling performance and overall operating cost.

A reliable track roller helps:

• Reduce track vibration
• Maintain correct track alignment
• Extend track chain and sprocket service life
• Reduce unexpected downtime

Every roller produced by our factory is inspected through:

• Raw material inspection
• Heat treatment verification
• Dimensional accuracy checking
• Seal performance testing

With professional manufacturing capability for excavator undercarriage parts, we provide OEM-compatible solutions with stable quality, competitive pricing and warranty support.

Contact us with your machine model, serial number, OEM part number and roller position to confirm the correct replacement.