Fitting a new sprocket over worn chains wastes the part — the worn chain pitch accelerates tooth wear and shortens sprocket life by up to 60%. This aftermarket sprocket 349d is machined to OEM tooth profile, pitch diameter, and bore for the 349D — and is best fitted alongside new track chains for full undercarriage life.

Why Choose This Sprocket 349D
– Tooth profile machined to OEM geometry
– Pitch diameter and bore confirmed to OEM drawing tolerance ±0.1mm
– Hub and mounting flange dimensions match OEM for direct fitment without modification

Heavy-Duty Construction
This sprocket 349d is manufactured using medium-carbon alloy steel: induction-hardened tooth flanks to 50–55 HRC for wear resistance. Core toughness retained below the hardened surface layer to resist impact fracture. Machined surface finish on bore and mounting faces for accurate seating. Designed to withstand vibration, impact loads, and harsh operating environments commonly found in construction, quarry, mining, and earthmoving applications. Precision manufacturing helps ensure correct fitment and long service life.

Applications
Suitable for a wide range of heavy equipment and undercarriage systems including:
– Excavators
– Dozers
– Loaders
– Track roller assemblies
– Earthmoving machinery undercarriage components

Maintenance Recommendations
– Replace sprocket and chain simultaneously
– Inspect carrier rollers and idler at the same time to assess full undercarriage condition
– Torque mounting bolts to OEM specification in a star pattern

Australia-Wide Supply
We supply high-quality sprocket 349d replacement parts across Australia with shipping from NSW. Suitable for aftermarket heavy equipment repairs and undercarriage maintenance applications.