Komatsu 4D105-3 Engine Crankshaft 6130-22-1100 High Hardness Forged Steel for PC120-3 PC150-3

1. Product Overview & Wholesale Price Range

The Komatsu 4D105-3 Forged Steel Crankshaft is designed for high-torque mining and construction environments. Each unit is processed with precision grinding and dynamic balancing to ensure smooth engine operation and extended service life.

• Factory Wholesale Price: $250 – $550 USD (Direct manufacturer pricing — save up to 40% over local dealers)
• MOQ: 1 Unit (Volume discounts for bulk container orders)
• Lead Time: 1–3 business days (Large stock ready for worldwide dispatch)
• Warranty: 12 Months full replacement warranty

2. Technical Specifications & Compatibility

Precision-matched for the Komatsu 105mm bore engine series:

3. 4D105-3 Crankshaft Troubleshooting & Signs of Failure

If your Komatsu excavator engine is exhibiting the following symptoms, it may be time to replace your crankshaft journals:

• Fault 1: Low Oil Pressure When Hot
  Diagnosis: Worn main journals increase clearance, preventing the oil film from supporting the load.
  Solution: Replace with a standard size (STD) high-hardness crankshaft to restore oil pressure.
• Fault 2: Metallic Knocking Sounds (Rapping)
  Diagnosis: Spun connecting rod bearings caused by journal scoring.
  Solution: Install our induction-hardened 4D105-3 crankshaft to handle high-stress mining work.
• Fault 3: Severe Engine Vibration
  Diagnosis: Crankshaft imbalance or structural fatigue.
  Solution: Our units are 100% dynamic balance tested to eliminate harmonic vibrations.

4. Frequently Asked Questions (Technical Support)

Q1: Is this 4D105-3 crankshaft compatible with the PC120-5?
A: No, the PC120-5 usually uses the 4D102 engine. This crankshaft is specifically for the 4D105-3 engine found in the PC120-3 series. Always verify your engine model nameplate.

Q2: What is the benefit of "High Hardness" treatment on this crankshaft?
A: Our induction hardening reaches HRC 52-58, which drastically reduces journal wear during cold starts and protects the crankshaft even if there is temporary lubrication loss.

Q3: Is this a forged or cast crankshaft?
A: We prioritize forged steel for the 4D105-3 to ensure maximum fatigue resistance under the heavy loads of a PC150 excavator.