Product Overview

The Carrier Roller, also known as Top Roller or Upper Roller, is mounted above the track frame of the Komatsu PC300-7 crawler excavator.

Its primary function is to support the upper track chain and maintain correct chain alignment during travelling. The carrier roller helps reduce friction, vibration and unnecessary wear throughout the undercarriage system.

A worn or seized carrier roller may result in:

• Track chain vibration
• Abnormal travelling noise
• Increased travelling resistance
• Uneven track chain movement
• Accelerated track link and bushing wear
• Increased undercarriage maintenance costs

Our PC300-7 carrier rollers are manufactured using professional undercarriage production processes and provide a reliable aftermarket replacement solution for equipment dealers, distributors, repair workshops and fleet operators.

Key Features & Benefits

Designed for Komatsu PC300-7

Compatible with:

Komatsu PC300-7

The exact mounting configuration should be confirmed using the machine serial number or existing carrier roller before ordering.

High-Strength Alloy Steel

Manufactured from:

40Mn2 Alloy Steel

Providing:

• High structural strength
• Good impact resistance
• Strong fatigue resistance
• Excellent wear resistance
• Long service life

Precision Heat Treatment

The roller working surface is subjected to controlled heat treatment.

Typical specification:

• Surface hardness: HRC 52-58
• Hardening depth: 8mm-12mm

This improves resistance against continuous track-chain contact and abrasive working environments.

Reliable Floating Seal System

Equipped with:

• Heavy-duty floating oil seals
• Wear-resistant bushings
• Lifetime internal lubrication

The sealed structure helps retain lubricant and protect internal components against dust, mud and water contamination.

OEM-Style Direct Replacement

Manufactured with controlled:

• Roller diameter
• Shaft dimensions
• Mounting dimensions
• Track-chain contact dimensions

Designed for bolt-on replacement when the correct configuration is selected.

Technical Specifications