Product Overview

The Track Roller — also known as Bottom Roller or Lower Roller — is a critical load-bearing component installed beneath the track frame of Komatsu PC400 crawler excavators.

For a 40-ton class excavator, track rollers work under extremely high static and dynamic loads. They support the machine weight, guide the track chain and distribute ground pressure evenly during digging, loading and travelling operations.

PC400 excavators are widely used in:

• Mining operations
• Quarrying
• Large infrastructure projects
• Heavy earthmoving applications

During operation, the track roller is exposed to:

• High impact loads
• Continuous vibration
• Rock and gravel abrasion
• Mud, dust and water contamination

A worn or damaged track roller may cause:

• Track chain deviation
• Uneven crawler movement
• Accelerated track link wear
• Increased sprocket and idler wear
• Higher maintenance costs

Our Komatsu PC400 track rollers are manufactured according to OEM-style drawings and production standards, providing reliable aftermarket replacement solutions for heavy-duty applications.

Key Features & Benefits

Wide Compatibility

Designed for:

• Komatsu PC400
• PC400LC
• PC400-5
• PC400-6
• PC400-7
• PC400-8

Suitable for construction, mining and heavy-duty excavation operations.

Single & Double Flange Options

Available configurations:

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

Suitable for different positions on the track frame.

Heavy-Duty Alloy Steel Construction

Manufactured from:

40Mn2 / 50Mn alloy steel

Advantages:

• High load-bearing capacity
• Excellent impact resistance
• Strong fatigue resistance
• Extended service life

Advanced Heat Treatment

The roller tread surface is induction hardened:

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

Improves resistance against:

• Rock impact
• Sand abrasion
• Heavy continuous loading

Reliable Floating Seal System

Equipped with:

• Heavy-duty floating oil seals
• Premium bushings
• Lifetime lubrication system

Designed to prevent:

• Oil leakage
• Mud intrusion
• Internal bearing damage

OEM-Style Direct Replacement

Manufactured with:

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

Provides direct bolt-on replacement without modification.

Technical Specifications

Why Trust Our Undercarriage Solutions?

For a 40-ton class excavator like Komatsu PC400, undercarriage components represent one of the largest maintenance investments throughout the machine lifecycle.

A reliable track roller helps:

• Maintain crawler stability
• Reduce travelling vibration
• Extend track chain service life
• Protect sprocket and idler components
• Reduce unexpected downtime

Every roller produced by our factory undergoes strict quality inspection:

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

With professional manufacturing capability for excavator undercarriage parts, we provide OEM-compatible replacement 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.