Product Overview

The Track Roller — also known as Bottom Roller or Lower Roller — is an important undercarriage component installed beneath the track frame of Kobelco SK55 crawler excavators.

The bottom roller supports the excavator weight, maintains track chain alignment and ensures smooth crawler movement during travelling and excavation operations.

For compact excavators operating in:

• Landscaping
• Urban construction
• Agricultural projects
• Rental fleets

the track roller is exposed to:

• Continuous loading
• Uneven terrain impact
• Soil and gravel abrasion
• Mud and water contamination

A worn or damaged track roller may cause:

• Track chain misalignment
• Increased travelling vibration
• Abnormal track noise
• Accelerated track link wear
• Higher maintenance costs

Our Kobelco SK55 track rollers are manufactured according to OEM-style drawings, providing reliable aftermarket replacement solutions for mini excavator users and equipment dealers.

Key Features & Benefits

Wide Compatibility

Designed for:

• Kobelco SK55
• Kobelco SK55SR
• Kobelco SK55SRX
• SK55SR-6

Reference OEM numbers:

• 72951433
• PW64D00010F0
• PW64D00010F1
• PW64D00010F2
• 772148.37300

Mini Excavator Heavy-Duty Design

Although installed on compact excavators, the roller features:

• High-strength steel body
• Precision machining
• Reinforced sealing structure

Suitable for:

• Construction contractors
• Landscaping companies
• Equipment rental businesses

High Strength Alloy Steel Construction

Manufactured from:

40Mn2 / 50Mn Alloy Steel

Advantages:

• Good wear resistance
• Strong impact resistance
• Stable performance under repeated loading

Heat Treatment Technology

The roller tread surface is hardened:

• Surface hardness: HRC 50-58
• Hardening depth: 4mm-8mm

Improves resistance against:

• Soil abrasion
• Gravel impact
• Daily operating wear

Reliable Seal System

Equipped with:

• Floating oil seal
• High-quality bushing
• Lifetime lubrication

Designed to prevent:

• Grease leakage
• Dust entry
• Water contamination

OEM-Style Replacement

Manufactured with:

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

Provides direct bolt-on replacement without modification.

Technical Specifications

Why Trust Our Undercarriage Solutions?

For mini excavators like Kobelco SK55, reliable undercarriage parts are essential for maintaining machine stability and reducing operating costs.

A quality track roller helps:

• Maintain track alignment
• Reduce vibration
• Extend track chain service life
• Improve travelling performance
• Reduce maintenance frequency

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.