Product Overview

The Track Roller — also known as Bottom Roller or Lower Roller — is a critical undercarriage component installed beneath the track frame of Caterpillar CAT E312 crawler excavators.

The bottom roller carries the machine operating weight, supports the track chain and maintains correct crawler alignment during travelling and excavation operations.

For a 12-ton class excavator, the track roller operates under demanding conditions:

• Continuous machine loading
• Impact from uneven terrain
• 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
• Uneven track wear
• Accelerated sprocket and idler wear

Our CAT E312 track rollers are manufactured according to OEM-style drawings, providing reliable aftermarket replacement solutions for construction contractors, equipment dealers and repair workshops.

Key Features & Benefits

Wide Compatibility

Designed for:

• CAT E312
• CAT 312
• CAT 312B
• CAT 312BL
• CAT E120B
• CAT E311
• CAT E313
• CAT E314

Reference OEM numbers:

• 4I7346
• 861934
• 151-9747
• CR5108
• 417346

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 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 abrasion
• Hard soil wear
• Continuous working loads

Reliable Floating Seal System

Equipped with:

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

Designed to prevent:

• Oil leakage
• Dust intrusion
• Mud and water contamination

OEM-Style Direct Replacement

Manufactured with:

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

Provides direct bolt-on replacement without modification.

Technical Specifications

Why Trust Our Undercarriage Solutions?

For a 12-ton class excavator like CAT E312, undercarriage components directly affect machine stability, travelling performance and operating cost.

A reliable track roller helps:

• Maintain proper track alignment
• Reduce crawler 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.