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GLOBALMACHEX
Komatsu PC40-7 PC40 PC45 Excavator Track Roller Bottom Roller Lower Roller Undercarriage Track Roller Assembly 20T-30-00070 Replacement

Komatsu PC40-7 PC40 PC45 Excavator Track Roller Bottom Roller Lower Roller Undercarriage Track Roller Assembly 20T-30-00070 Replacement

Model: PC40TR

USD $40.00 - $100.00 / Pieces

Min. Order: 1 Pieces

Model:
PC40
Description:
Track Roller
Replacement:
PC40-7 PC45
Part No.:
20T-30-00070
Supported Trade Terms:
FOBEXW
Lead Time:
in stock
Supply Ability:
10,000 Pieces
Shipping Port:
Xiamen, China
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Product Features & Applications

Heavy-duty Track Roller (Bottom Roller / Lower Roller) for Komatsu PC40-7, PC40 and PC45 mini excavators. Manufactured from high-strength alloy steel with precision machining, heat treatment and reliable sealing technology. The roller supports the machine weight, guides the track chain and ensures smooth travelling performance for 4-ton class mini excavators used in construction, landscaping and utility projects. Compatible with Komatsu PC40-7 series excavators. Reference OEM numbers include 20T-30-00070, 20T-30-00171, 20T-30-00172 and 20T-30-00173. Available in Single Flange (SF) and Inner Flange (IF) versions according to track frame configuration. Manufactured according to OEM-style dimensions for direct replacement with excellent wear resistance, reliable sealing performance and long service life. Please provide your machine serial number or existing OEM part number to confirm exact fitment.

Product Overview

The Track Roller — also known as Bottom Roller or Lower Roller — is an essential undercarriage component installed beneath the track frame of Komatsu PC40-7 crawler excavators.

The roller supports the machine weight, maintains track chain alignment and ensures stable crawler movement during travelling and excavation operations.

For a compact excavator, 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 deviation
  • Increased travelling vibration
  • Abnormal crawler noise
  • Uneven track wear
  • Premature sprocket and idler wear

Our Komatsu PC40-7 track rollers are manufactured according to OEM-style drawings, providing reliable aftermarket replacement solutions for mini excavator dealers, rental fleets and repair workshops.

Key Features & Benefits

Wide Compatibility

Designed for:

  • Komatsu PC40-7
  • Komatsu PC40-6
  • Komatsu PC45-1
  • Komatsu PC50UU series

Reference OEM numbers:

  • 20T-30-00070
  • 20T-30-00171
  • 20T-30-00172
  • 20T-30-00173
  • 20T-30-00041

Compact Excavator Heavy-Duty Design

Although used on mini excavators, the roller is manufactured with:

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

Suitable for:

  • Construction contractors
  • Landscaping companies
  • Agricultural applications
  • Equipment rental fleets

High Strength Alloy Steel Construction

Manufactured from:

40Mn2 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 structure

Provides direct bolt-on replacement without modification.

Technical Specifications

Item Specification / Detail
Machine Model Komatsu PC40-7 Excavator
Compatible Models PC40-7 / PC40 / PC45 / PC50UU
Machine Class 4 Ton Mini Excavator
Part Type Track Roller (Bottom Roller / Lower Roller)
OEM Part Number 20T-30-00070 / 20T-30-00171 / 20T-30-00172 / 20T-30-00173
Flange Type Single Flange (SF) / Inner Flange (IF)
Material High-strength 40Mn2 Alloy Steel
Manufacturing Method Forging / Casting / Machining
Surface Hardness HRC 50-58
Hardening Depth 4mm - 8mm
Sealing Floating oil seal, lifetime lubricated
Mounting OEM standard, bolt-on direct replacement
Application Mini excavator, construction and landscaping
Shipping Note Small component — suitable for air or sea freight

Why Trust Our Undercarriage Solutions?

For mini excavators like Komatsu PC40-7, reliable undercarriage components help maintain machine performance and reduce maintenance frequency.

A quality track roller helps:

  • Maintain track alignment
  • Reduce vibration
  • Extend track chain service life
  • Improve travelling stability
  • Reduce operating costs

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.

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