344-2603 Crankshaft AS CAT spare part

344-2603 Crankshaft AS CAT spare part Featured Image
  • 344-2603 Crankshaft AS CAT spare part
  • 344-2603 Crankshaft AS CAT spare part
  • 344-2603 Crankshaft AS CAT spare part

Short Description:

468-5120 CAT C18 engine crankshaft assembly is forged steel crankshaft with bolt-on counterweights and 66-tooth timing gear. It converts piston reciprocating motion into rotary power for overhaul of CAT C18 engines fitted on 385C, 390D, 390F excavators and D9T dozers.


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description

This crankshaft is the core drive assembly for heavy-duty C18 diesel engine. It is forged from high-strength alloy steel with removable bolt-on counterweights. The journals, flange and gear are precision machined integrally. It goes through quenching & tempering, journal grinding, oil passage polishing, stress relief and dynamic balance inspection. It withstands continuous heavy impact in quarry and mining sites. Damaged counterweights can be replaced separately instead of the whole crankshaft. Widely used for C18 power assemblies of large mining excavators, track dozers, generator sets and mining trucks.

Part number: 344-2603
Alternative name: Crankshaft AS
Cross reference: 2W-7458, 2Y-4517
Fit engine: CAT 3306B, 3306C
Fit machine: 235B/235C/235D excavator, 611, 615C, 627B, 627F, 627G scraper, 545, 572R skidder, 350 loader
Material: Forged carbon steel, induction hardened journals
Structure: Integrated forged counterweights
Process: Forging, stress relief, quenching & tempering, journal induction hardening, precision grinding, oil passage polishing, MPI crack test, dynamic balance calibration
Matching system: 3306 direct injection diesel engine

Advantages

1. One-piece forged blank without bolted counterweights, eliminates loose counterweight failure risk.
2. Induction hardened journal surface improves wear resistance under continuous heavy load of legacy engines.
3. Factory dynamic balance calibration ensures smooth rotation and protects damper and oil seals.
4. Oil gallery size and layout match original design for reliable bearing lubrication.
5. Compatible with multiple 3306 machine variants, convenient for old fleet maintenance.
6. Optimized fillet radius reduces stress concentration and crank fracture risk.

FAQ 

Q1: Can 344-2603 replace 4N-7693 crankshaft directly?
A1: Check engine serial number. Some 3306 subversions have different flange and oil galleries, direct swap is not allowed.
Q2: Can journals be reground after hardening layer wears?
A2: Do not grind beyond the hardened depth. Once the hard layer is removed, journals will wear rapidly.
Q3: Is timing gear replacement required together with crankshaft?
A3: Inspect gear teeth. Replace gear if pitting, chipping or cracks exist.
Q4: How to store the crankshaft for long time?
A4: Coat journals and flange with anti-rust grease, support on multi-point fixture to avoid bending.

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