Product Overview

The Front Idler Assembly, also known as Track Idler or Guide Wheel, is installed at the front section of crawler excavator undercarriage.

Its main functions include:

• Guiding the track chain during machine travel
• Maintaining correct track alignment
• Working with the hydraulic track tension system
• Absorbing impact loads from uneven ground
• Improving undercarriage service life

For compact excavators such as Doosan DH55, the undercarriage system operates under frequent travel, excavation impact and variable ground conditions.

A worn or damaged front idler may cause:

• Track chain deviation
• Abnormal vibration
• Uneven track wear
• Increased travel resistance
• Premature wear of track rollers and track chains

Our DH55 front idlers are manufactured with professional undercarriage production technology, providing reliable replacement solutions for machinery dealers, rental companies and repair workshops.

Key Features & Benefits

Compact Excavator Application

Designed for:

Doosan DH55 / DH55LC

Suitable for:

• Small construction projects
• Landscaping
• Agricultural applications
• Utility works
• General excavation

High-Strength Alloy Steel

Manufactured from:

40Mn2 Alloy Steel

Benefits:

• High impact resistance
• Strong wear resistance
• Good fatigue performance
• Stable operation under repeated loading
• Extended service life

Precision Heat Treatment

The idler tread surface is processed through controlled induction hardening.

Typical specification:

• Surface hardness: HRC 50-58
• Hardening depth: 8mm-12mm

Provides improved resistance against continuous track chain contact.

Reliable Sealing System

Equipped with:

• Floating oil seals
• Wear-resistant bushings
• Lifetime internal lubrication

The sealing system protects internal components from:

• Dust
• Mud
• Water contamination

OEM-Style Direct Replacement

Manufactured according to OEM-style dimensions:

• Idler diameter
• Shaft dimensions
• Mounting dimensions
• Track contact profile

Suitable for direct replacement after confirming specifications.

Technical Specifications