PC650‑3 PC650‑5 6211‑31‑1010 6D140 Direct Injection Forged Steel Engine Crankshaft Compatible with Komatsu

1. Product Overview & Wholesale Price Range

The 6D140 Direct‑Injection Forged Steel Crankshaft (Part # 6211‑31‑1010) is heavy‑duty alloy steel main shaft for 6‑cylinder 14.2L direct‑injection diesel engine, widely fitted on large‑tonnage Komatsu excavators and mining machinery.

• Factory Wholesale Price: $850‑1450 USD Direct factory supply, save cost compared with local dealer markup price
• Material: 42CrMo Precision Forged Alloy Steel, journal high‑frequency hardening HRC55‑60
• MOQ: 1 Unit, bulk discount for engine repair shop batch orders
• Stock Lead‑time: In stock, 1‑3 working days dispatch worldwide
• Warranty: 12‑month replacement warranty, 100% dynamic balance & magnetic particle crack test before delivery

2. Machine & Engine Compatibility List

Perfect replacement for below Komatsu heavy‑duty construction & mining machines:

• Excavator: PC650‑3, PC650‑5, PC650LC‑3, PC650LC‑5
• Engine Model: 6D140‑1 Direct Injection Diesel Engine
• OEM Part Number: 6211‑31‑1010

3. Common 6D140 Crankshaft Fault Diagnosis Guide

Typical failure symptoms for Komatsu 6D140 direct‑injection engine crankshaft:

• Journal Scoring / Groove Wear: Engine oil contamination causes journal scratch damage. Solution: Install new forged crankshaft, do not reuse re‑grinded old shaft.
• Metallic Knocking Noise & Rod Bearing Burnout: Oil starvation or long‑time heavy mining operation leads to bearing damage. Replace crankshaft together with full main & rod bearing shell set.
• Crankshaft Fatigue Crack / Breakage: Mining overload or torsional damper failure. Use reinforced 42CrMo forged crankshaft for high‑load mining site.
• Front / Rear Oil Seal Leakage: Seal running‑groove wear on shaft ends. Fit new crankshaft together with brand‑new oil seal kits.
• Heavy Engine Vibration: Shaft bending or imbalance damage. Only use fully dynamically balanced new crankshaft assembly.

4. Related Popular Komatsu Excavator Spare Parts

5. Frequently Asked Questions

Q1: How do I confirm this 6D140 crankshaft fits my PC650‑5 excavator?
A: Verify engine type 6D140‑1 direct‑injection and OEM casting No.6211‑31‑1010. You can send us engine serial number for quick fitment verification.

Q2: What quality tests are performed before shipment of this 6D140 crankshaft?
A: Every crankshaft passes dynamic balance testing and magnetic particle crack inspection, avoiding vibration and hidden crack risk for mining heavy‑load working conditions.

Q3: Can you supply matching engine overhaul kits for Komatsu 6D140 engine?
A: Yes, full overhaul kits, bearing shells, cylinder liners, piston assemblies are available for 6D140 engine, support one‑stop purchasing for complete engine rebuild projects.