Caterpillar crankshaft 4W3989 4W3579 S4K crankshaft S4K-T crankshaft CAT 312B crankshaft Caterpillar excavator crankshaft

◆ Product Overview
A durable, high-precision crankshaft designed for the Caterpillar S4K and S4K-T diesel engines, specifically used in the CAT 312B excavator. Manufactured as a direct OEM replacement for part numbers 4W3989 and 4W3579, this crankshaft ensures reliable performance, smooth operation, and extended service life in mid-sized excavation and construction applications.

◆ OEM Part Numbers
✓ 4W3989
✓ 4W3579

◆ Compatible Engine & Equipment
✓ Caterpillar S4K Engine
✓ Caterpillar S4K-T Engine
✓ CAT 312B Excavator

◆ Product Specifications
✓ Condition: 100% Brand New
✓ Material: High-Strength Forged Steel
✓ Application: Mid-Sized Excavator & Construction Equipment
✓ Finish: Precision Ground, Hardened & Micro-Polished

◆ Key Features
✓ Direct OEM Replacement for S4K & S4K-T Engines in 312B Excavator
✓ Forged Steel Construction for Enhanced Fatigue & Torsional Strength
✓ Optimized for Responsive Power & Smooth Operation in Excavation Cycles
✓ Restores Original Engine Performance, Fuel Efficiency & Reliability

◆ Quality Assurance
✓ 100% New Production – Not Remanufactured
✓ Full Dimensional & Material Compliance Verified
✓ Non-Destructive Testing (NDT) & Hardness Testing Passed
✓ Dynamically Balanced for Low-Vibration, High-Efficiency Operation

◆ Installation Applications
✓ Complete Overhaul of S4K/S4K-T Engine in CAT 312B Excavator
✓ Crankshaft Replacement Due to Wear or Fatigue in Mid-Sized Excavators
✓ Fleet Maintenance for Construction & Utility Excavator Fleets
✓ Performance Restoration for Caterpillar 312B Excavators

◆ Service Advantages
✓ Ensures Reliable Uptime in General Construction & Excavation Projects
✓ OEM-Compatible Fit for Straightforward Installation & Long-Term Reliability
✓ Reduces Operational Downtime for Mid-Sized Excavator Fleets
✓ Supported by Global Caterpillar Parts Distribution Networks