6204-33-1100 crankshaft for Komatsu S4D95 3.3L engines. Fits PC60-7 & WA150. Forged alloy steel prevents journal wear. Wholesale pricing available
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Heavy-duty forged alloy steel crankshaft for Komatsu S4D95 and 4D95L engines.
Induction hardened journals prevent journal scuffing during cold start operations.
OEM: 6204-33-1100 | Cross-reference: 6202-31-1100, 6207-31-1201, 6205-31-1202. Fits Komatsu PC60-7 excavators and WA150-3 wheel loaders.
Volume discounts available.
The Komatsu S4D95 and 4D95L engine series represents a highly respected 3.3L inline-4 diesel platform (3,260 cc) widely utilized in compact construction machinery, including PC60-5, PC60-6, and PC60-7 excavators, and WA150-3 wheel loaders. At the heart of this high-torque powerplant is the premium Komatsu S4D95 crankshaft (OEM 6204-33-1100, cross-reference 6202-31-1100, 6207-31-1201), engineered to converting linear piston force into smooth rotational output. While some light utility operations utilize cast shafts, our S4D95 forged shaft is precision-manufactured from high-tensile alloy steel to withstand severe torsional stress under heavy excavation cycles. In high-frequency operations, common failure modes include bearing oil-film shear, causing journal scuffing cold start damage or hairline cracking along the journal fillet radii. To counter these heavy-duty stresses, each forged steel crankshaft S4D95 features induction-hardened main journals (70mm standard) and conrod journals (57mm standard) ground to strict roundness limits. Rebuilders must check the crankshaft thrust play (standard: 0.050 to 0.220 mm) and verify the oil clearance (standard: 0.038 to 0.090 mm) during any major 6204-33-1100 crankshaft replacement project. This meticulous engineering makes it the ultimate WA150 loader crankshaft and Komatsu PC60-5 crankshaft replacement option, ensuring long-term rotation reliability for global utility fleets.
| Parameter | Value |
|---|---|
| Engine Code | Komatsu S4D95 / 4D95 / 4D95L (3.26L) |
| Configuration | Inline-4 Cylinders, 8 Valves OHV |
| Engine Cylinder Bore | 95.0 mm |
| Crankshaft Stroke | 115.00 mm (4.5276 in) |
| Main Journal Diameter | 70.00 mm (Standard Range: 70.000 – 70.015 mm) |
| Rod Pin Diameter | 57.00 mm (Standard Range: 57.000 – 57.015 mm) |
| Crankshaft Thrust Play | 0.050 – 0.220 mm (Wear Limit: 0.30 mm) |
| Crankshaft Net Weight | 28.00 kg (61.7 lbs) |
| Material Spec | Precision Forged Alloy Steel (42CrMo equivalent) |
| Hardness Treatment | Induction Hardened Journals (HRC 50+) |
| Primary OEM Number | 6204-33-1100 |
| Interchange References | 6202-31-1100, 6207-31-1201, 6205-31-1202, 6204331100 |
Our Komatsu engine components catalog covers the full light-duty and heavy-duty inline families, from the 2.8L 4D94E and 3.3L S4D95 to the high-output 11.0L SAA6D125 and 15.2L S6D170 lines. Explore our complete range of Komatsu diesel engine parts by visiting our Komatsu Brand Hub to find matching cylinder heads, cylinder liners, and camshaft assemblies.
6204-33-1100, Industrial Diesel Engine Parts, Komatsu Engine Spares, Komatsu S4D95 Crankshaft, S4D95 Forged Shaft, WA150 Loader Crankshaft
| Engine Model | Primary Part Number | Machine Model |
|---|---|---|
| S4D95 | 6204-33-1100 | PC60-5 WA150 Loader |
| S4D102 | 6732-31-1100 | PC120-6 PC100-6 Excavator |
| S6D95 | 6207-31-1100 | PC200-5 PC200-6 Excavator |
| S6D102 | 6735-01-1310 | PC200-6 PC200-7 Excavator |
| S6D105 | 6136-31-1110 | PC200-3 Excavator |
| S6D107 | 6754-01-1310 | PC200-8 Excavator |
| S6D108 | 6222-31-1110 | PC300-6 Excavator |
| S6D110 | 6138-31-1110 | PC220-5 GD605 Grader |
| S6D114 | 6742-01-1570 | PC300-7 PC300-8 Excavator |
| S6D125 | 6151-31-1110 | PC400-3 PC400-5 Excavator |
| S6D140-2 | 6211-31-1010 | PC600-6 Excavator |
| S6D140-3 | 6217-31-1010 | PC750-6 PC800 Excavator |
| S6D140-5 | 6261-31-1200 | PC800-8 PC850-8 Excavator |
| S6D155 | 6127-31-1012 | D155A-2 Bulldozer |
| NT855 | 6710-31-1111 | D85 Bulldozer |
| NH220 | 6623-31-1111 | D60 Bulldozer |
| S6D170 | 6245-31-1100 | PC1250-7 Excavator |
| 4D95L | 6204-31-1201 | PC60 PC75 Excavator |
| 4D94E/4TNE94 | - | PC30 PC35 PC40 Excavator |
Komatsu crankshafts fit heavy machinery including Komatsu PC60-7 Excavator, Komatsu PC75 Excavator, Komatsu WA150-3 Wheel Loader, and Komatsu Forklifts.
Contact us for complete application coverage.
| Make | Machine / Vehicle Model | Year Range | Engine Code | Crankshaft OEM |
|---|---|---|---|---|
| Komatsu | PC60-5 / PC60-6 / PC60-7 Excavator (PC60 crankshaft) | 1989–2006 | S4D95 / 4D95 | 6204-33-1100 |
| Komatsu | WA150-1 / WA150-3 Wheel Loader (WA150 crankshaft) | 1991–2004 | S4D95 / 4D95L | 6204-33-1100 |
| Komatsu | PC75 Excavator (Komatsu small loader crankshaft) | 1993–2001 | S4D95 Inline-4 | 6204-33-1100 |
| Komatsu | Forklift / Marine Power Unit (forged steel crankshaft S4D95) | 1990–2005 | 4D95 / 4D95L | 6204-33-1100 |
Symptom: Metallic knocking sounds from the lower block, low engine oil pressure when warm, and rough idling during early startup. (journal scuffing cold start)
Diagnosis: Starting the engine without proper pre-lubrication (dry start) or using incorrect viscosity oil allows direct metal-to-metal contact on the 70mm main journals. This causes immediate scuffing or scoring before the oil pump builds full pressure.
Solution: Replace the scored shaft with a precision-forged unit featuring nitrided journals, use high-lubricity multi-grade oil, and replace the engine oil pump during overhaul.
Symptom: Hairline cracks on fillet radiuses, crankshaft snapping, or complete engine seizure under severe loading shifts. (S4D95 forged shaft)
Diagnosis: Standard cast iron crankshafts have a random grain structure and lower tensile strength, making them susceptible to stress-fatigue cracking under high-torque digging cycles.
Solution: Sourcing an OEM-spec S4D95 forged shaft (6204-33-1100) ensures a highly aligned grain structure with superior torsional and fatigue strength, safely enduring continuous high-idle excavator operations.
Symptom: Mismatched clearances, rapid bearing wear, or thrust washer binding shortly after initial engine startup. (6204-33-1100 crankshaft replacement)
Diagnosis: Incorrect torque sequence or improper bearing tolerances stretch main bolts unevenly, creating uneven oil clearances and leading to bearing failure.
Solution: Torque the main bearing cap bolts in three progressive stages to the final specification of 132 to 142 Nm (98 to 105 lbf·ft) using clean engine oil. Verify that bearing oil clearance is within 0.038 to 0.090 mm, and check end play thrust clearance (standard: 0.050 to 0.220 mm).
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