6BT 6CT 8.3L Engine Crankshaft Forged Steel 3917320 3918986 Compatible with Komatsu PC300-7 PC350-7

1. Product Overview & Factory Wholesale Price

The 6CT 8.3L Crankshaft is the core power component for 30-ton class heavy excavators. Our crankshafts are manufactured using premium 42CrMo forged steel and multi-stage dynamic balancing to handle the extreme torque of mining and construction environments.

• Factory Wholesale Price: $350 – $850 USD (Direct manufacturer pricing — Tiered discounts for bulk orders)
• Material: High-Tensile Forged Steel (Induction Hardened Journals)
• Precision Level: Compatible with EFI / Common Rail Fuel Systems
• Engine Models: 6CT8.3, 6L8.9, ISC, QSL, QSC
• Warranty: 12 Months full replacement warranty

2. Technical Compatibility & Application

3. Maintenance Guide: 6CT Crankshaft Troubleshooting

In high-torque PC300-7 excavator applications, monitor your engine for these crankshaft failure signs:

• Abnormal Engine Vibration: Often caused by an unbalanced crankshaft or damaged balancer. Our EFI-grade crankshafts ensure ultra-smooth rotation.
• Main Journal Scoring (轴颈拉伤): Caused by low-quality oil. Our induction-hardened journals offer superior wear resistance.
• Low Oil Pressure: Excessive clearance at the crankshaft journals can lead to pressure loss. Replacing with a new 3917320 assembly restores factory specs.
• Crankshaft Snapping (曲轴断裂): Usually occurs with low-grade cast iron parts. We recommend Forged Steel for all mining and heavy digging work.

4. Frequently Asked Questions

Q1: Is this crankshaft suitable for Common Rail (EFI) engines?
A: Yes. Our "EFI-grade" 6CT crankshaft is manufactured with tighter tolerances and better dynamic balancing specifically for ISC, QSL, and 6L common rail engines.

Q2: Do you provide matching main bearings and con-rod bearings?
A: Absolutely. We offer full engine overhaul kits including 6CT bearings (STD, 0.25, 0.50), pistons, and gasket sets.

Q3: How do you guarantee shipping safety for such a heavy part?
A: Each 6CT crankshaft is rust-proofed, plastic-wrapped, and secured in a custom-built, reinforced export wooden crate to prevent bending during transport.