3406 Forged Steel Crankshaft 6I‑1453 for Heavy‑Duty Excavator Diesel Engine

1. Product Overview & Wholesale Price Range

The 3406 Forged Steel Crankshaft (Part # 4W3989) is high‑strength forged alloy steel main shaft for 3406 diesel engine, transferring piston power for heavy‑load working, widely fitted on excavators and mining construction machinery.

• Factory Wholesale Price: $1450‑2100 USD / piece Direct factory supply, favorable bulk price for repair shops and distributors
• Material: Forged Alloy Steel, journal high‑frequency quenching HRC55‑60, standard plain version without signal gear teeth
• MOQ: 1 Piece, bulk discount for large quantity orders
• Stock Lead‑time: In stock, 1‑3 working days dispatch for worldwide customers
• Warranty: 12‑month replacement warranty, dynamic balance & magnetic particle crack inspection before shipment

2. Engine & Application Compatibility List

Perfect fit for 3406 plain‑version diesel engine, applied on multiple heavy‑duty equipment:

• Engine Model: 3406
• OEM Part Number: 4W3989
• Version: Standard plain crankshaft, no signal gear teeth
• Applications: Excavators, mining machinery, generator sets, heavy‑duty construction equipment

3. Common Crankshaft Failure Phenomena

• Journal scratch & wear: Caused by dirty engine oil and bearing failure. Replace complete new forged crankshaft instead of re‑grinded reused shaft.
• Fatigue crack & fracture risk: Long‑time overload operation. Adopt qualified forged crankshaft to avoid sudden shaft breakage.
• Dynamic balance deviation: Result in engine vibration and abnormal knocking. Every finished crankshaft must pass dynamic balance testing.
• Oil‑seal position wear groove: Lead to engine oil leakage. Replace crankshaft together with new oil seal sets during overhaul.
• Counterweight deformation: Engine violent knocking accident. Must replace full crankshaft assembly, do not repair deformed counterweight.

4. Related Popular Diesel Engine Spare Parts

5. Frequently Asked Questions

Q1: How can I confirm this plain crankshaft fits my 3406 engine?
A: Confirm OEM number 4W3989 and your engine does not require signal gear teeth. Send engine serial number for cross‑check compatibility.

Q2: What quality inspections are done before shipment?
A: Each 3406 crankshaft goes through magnetic particle crack detection, dynamic balance test and journal dimension check to eliminate hidden defects for heavy‑load operation.

Q3: Can you supply full overhaul spare‑parts for 3406 engine?
A: Yes, connecting rod, piston kits, bearing shells, cylinder liners and full overhaul kits are available for one‑stop engine rebuild purchasing.