KBKomatsu 4D102 S4D102 Engine Crankshaft for PC120-6 PC130-6 PC200-6 OEM 6732-21-1100

1. Product Overview & Wholesale Price Range

The Komatsu 4D102 / S4D102 Crankshaft is an essential engine component for small to mid-sized construction machinery. Our "Common/Alloy Casting" version offers a perfect balance between high performance and cost-efficiency for standard maintenance and engine overhauls.

• Factory Wholesale Price: $160 – $350 USD (Direct manufacturer pricing — Save up to 50% vs regional dealers)
• Material: High-Grade Alloy Casting (Standard OEM Grade)
• Hardness & Finish: Induction hardened journals with Ra 0.2 surface finish
• Lead Time: 1–3 business days (Large stock ready for worldwide dispatch)
• Warranty: 12 Months full replacement warranty

2. Technical Specifications & Compatibility Checklist

3. 4D102 Engine Crankshaft Troubleshooting

Common signs that your Komatsu 4D102 engine needs a new crankshaft:

• Metallic Rapping Noise: Often caused by excessive play at the main or connecting rod journals.
• Drop in Oil Pressure: Scored journal surfaces prevent proper oil film formation. Our precision-ground 4D102 crankshaft restores oil pressure to factory levels.
• Engine Vibration: A bent crankshaft or failed harmonic balancer causes severe shaking. Every LongYing crankshaft is dynamic balance tested to ensure zero vibration.

4. Frequently Asked Questions (FAQ)

Q1: Is this crankshaft interchangeable with Cum-mins B3.9?
A: Yes, since the Komatsu 4D102 is based on the Cum-mins B-series engine, this crankshaft is compatible with Cum-mins 3.9L (4BT) engine applications.

Q2: Do you provide the matching bearing sets?
A: Yes. We can supply a complete 4D102 Engine Rebuild Kit including main bearings, con-rod bearings, thrust washers, pistons, and liners.

Q3: How is the product packaged for export?
A: We use rust-inhibiting oil, plastic wrapping, and high-strength export wooden crates to ensure your crankshaft arrives in perfect condition.