6BT 5.9L Engine Crankshaft Forged Steel 3907804 3929318 Compatible with Komatsu PC200-5 PC220-5

1. Product Overview & Factory Wholesale Price

The 6BT 5.9L Crankshaft is engineered for high-performance diesel engines used in construction, marine, and logistics sectors. Our crankshafts are produced using advanced forging technology, ensuring superior fatigue resistance compared to cast iron alternatives.

• Factory Wholesale Price: $220 – $480 USD (Direct manufacturer pricing — Tiered discounts available for bulk container orders)
• Material: 42CrMo High-Tensile Forged Steel (Induction Hardened)
• MOQ: 1 Piece (Sample orders accepted)
• Lead Time: 1–3 business days (Large warehouse stock ready for global dispatch)
• Warranty: 12 Months with 100% dynamic balance test before shipping

2. Technical Specifications & Compatibility

Precision-ground to microns to ensure perfect oil film maintenance and smooth rotation under high-load conditions:

3. Troubleshooting Guide: 6BT Crankshaft Failures

Common issues that require immediate crankshaft replacement in 6BT 5.9L engines:

• Fault 1: Journal Scoring & Scratches (轴颈拉伤):
  Cause: Contaminated oil or debris in the lubrication system.
  Solution: If scratches exceed 0.25mm, replace with our new 3907804 forged crankshaft to avoid bearing seizure.
• Fault 2: Engine Vibration & Noise (发动机异常震动):
  Cause: Crankshaft imbalance or damaged harmonic balancer.
  Solution: Our 6BT crankshafts are 100% dynamic balanced at the factory to eliminate high-RPM vibration.
• Fault 3: Snapped/Broken Crankshaft (曲轴断裂):
  Cause: Severe overloading or using low-quality cast iron parts in high-torque applications.
  Solution: Upgrade to our Forged Steel version which offers 40% higher tensile strength.

4. Frequently Asked Questions

Q1: Is this 6BT crankshaft Forged Steel or Cast Iron?
A: We provide the Forged Steel version as our standard high-quality offering, which is significantly more durable than cast iron for heavy excavator work.

Q2: Do you provide matching main bearings and con-rod bearings?
A: Yes, we offer complete engine kits including 6BT bearings, gaskets, and pistons for a full engine overhaul.

Q3: How do you ensure the crankshaft is not bent during shipping?
A: Every crankshaft is coated in anti-rust oil, wrapped in moisture-proof plastic, and secured in a custom-fitted, reinforced wooden export crate.