Komatsu 4D105-5 Engine Crankshaft Forged Steel for D31 D37 Dozer PC100 PC120 Excavator

1. Product Overview & Wholesale Pricing

The Komatsu 4D105-5 Engine Crankshaft is critical for the reliable operation of your Komatsu machinery. Our crankshafts undergo rigorous induction hardening and multi-stage grinding to meet strict tolerance standards, providing a cost-effective alternative to expensive OEM replacements without compromising on longevity.

• Factory Wholesale Price: $300 – $650 USD (Direct manufacturer pricing — Save up to 60% compared to local dealers)
• Material: Heavy-duty Forged Steel (Induction Hardened)
• Application: Komatsu D31S, D37E, PC100-3, PC120-5, PC150-3
• Engine Model: Komatsu 4D105-5 / 4D105 Series
• Warranty: 1-Year full replacement warranty

2. Equipment Compatibility & Application

Our 4D105-5 crankshafts are engineered for high-torque environments such as construction, road building, and quarrying:

3. Maintenance Guide: When to Replace Your 4D105-5 Crankshaft?

To avoid catastrophic engine failure, watch for these common symptoms of crankshaft wear in your Komatsu 4D105 engine:

• Low Oil Pressure Warning: Often caused by excessive clearance between the crankshaft journals and the main bearings.
• Unusual Engine Vibrations: Indicates an unbalanced crankshaft or damaged counterweights, which can lead to engine block cracking.
• Metallic Knocking Noises: A sign of worn journals or spun bearings requiring immediate crankshaft inspection.
• Engine Seizure: Total failure often resulting from "black oil" or lubrication blockage, scoring the crankshaft journals beyond repair.

4. Frequently Asked Questions (FAQ)

Q1: Is this 4D105-5 crankshaft forged or cast iron?
A: We prioritize Forged Steel for the 4D105-5 model to ensure it can handle the high compression and load requirements of Komatsu dozers and excavators.

Q2: Do you provide the matching main and rod bearings?
A: Yes, we offer complete engine overhaul kits including 4D105-5 bearings (STD, 0.25, 0.50 sizes), pistons, and gasket sets for a one-stop repair solution.

Q3: How is the crankshaft protected during shipping?
A: Every crankshaft is coated with anti-rust oil, wrapped in moisture-proof plastic, and secured in a reinforced export-grade wooden crate.