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 Hitachi EX400 crawler excavators.

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

During mining and heavy construction work, the rollers are continuously exposed to:

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

A worn or damaged track roller may result in:

• Track chain misalignment
• Excessive vibration
• Accelerated track link wear
• Increased sprocket and idler wear
• Higher maintenance costs

Our Hitachi EX400 track rollers are manufactured according to OEM-style drawings, providing reliable aftermarket replacement solutions for heavy-duty crawler excavators.

Key Features & Benefits

Wide Compatibility

Designed for:

• Hitachi EX400
• Hitachi EX400LC
• EX400 series crawler excavators

Suitable for:

• Mining
• Quarrying
• Heavy construction

Single & Double Flange Options

Available configurations:

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

Suitable for different installation positions on the track frame.

Heavy-Duty Alloy Steel Construction

Manufactured from:

40Mn2 / 50Mn alloy steel

Advantages:

• High load-bearing capability
• 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

Provides excellent resistance against:

• Rock impact
• Abrasive soil
• 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

Allows direct bolt-on replacement without modification.

Technical Specifications

Why Trust Our Undercarriage Solutions?

For a 40-ton class excavator like Hitachi EX400, undercarriage components are among the highest-cost wear parts during machine operation.

A reliable track roller helps:

• Maintain track alignment
• Reduce vibration
• Extend track chain and sprocket service life
• Improve machine availability

Every roller produced by our factory undergoes strict 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.