C13 120‑639 Forged Steel Crankshaft Compatible with Construction Machinery Engine

1. Product Overview & Wholesale Price Range

The C13 Forged Steel Crankshaft (Part # 120‑639) is manufactured from high‑strength forged steel blank. Precision grinding on main journal and crank pin, finished hardness test and non‑destructive crack inspection. It converts piston reciprocating thrust into rotary power for heavy‑duty construction equipment.

• Factory Wholesale Price: $880‑1150 USD / piece Direct factory supply, favorable bulk price for repair shops and distributors
• Material: Forged Steel, precision journal grinding, hardness & crack inspection
• 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, dimension & defect inspection before shipment

2. Engine & Application Compatibility List

Perfect fit for C13 diesel engine, widely applied on construction machinery:

• Engine Model: C13
• OEM Part Number: 120‑639
• Structure: Forged steel crankshaft assembly
• Applications: Excavators, wheel loaders and other heavy‑duty construction machinery

3. Common Crankshaft Failure Phenomena

• Journal wear & scoring: Caused by poor lubrication or oil shortage. Replace crankshaft when journal wear exceeds tolerance limit.
• Bending & torsion deformation: Triggered by engine seizure or heavy impact. Straightening is not recommended, install brand‑new forged crankshaft.
• Fatigue crack: Occurs under long‑term cyclic heavy load. Strict inspection before delivery to prevent crankshaft fracture during operation.
• Oil seal position wear: Will result in engine oil leakage. Check seal journal surface during overhaul replacement work.
• Thread & flange damage: Caused by improper installation torque. Replace whole crankshaft assembly once key position gets damaged.

4. Related Popular Diesel Engine Spare Parts

5. Frequently Asked Questions

Q1: How do I confirm this crankshaft fits my C13 engine?
A: Confirm OEM number 120‑639. Send your engine serial number for cross‑check compatibility before placing order.

Q2: What quality checks before shipment?
A: Each crankshaft undergoes journal dimension measurement, hardness test and crack inspection to guarantee stable heavy‑load operation performance.

Q3: Can you supply full overhaul spare‑parts for C13 engine?
A: Yes, connecting rods, piston kits, bearing shells and full overhaul kits are available for one‑stop engine rebuild purchasing.