HRC 52-58 camshaft (OEM 6114-41-1110) for Komatsu PC400 and PC450 excavators with S6D120 engines. Resists lobe spalling. Wholesale pricing available now
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Heavy-duty induction hardened camshaft for Komatsu S6D120 and SA6D120 engines.
Induction hardened lobes (HRC 52-58) prevent lobe surface spalling under extreme earthmoving stress.
OEM: 6114-41-1110 | Cross-reference: 6114-41-1100, 6110-41-1112. Fits Komatsu PC400, PC450 excavators and D85 bulldozers.
Wholesale pricing available.
The Komatsu S6D120 engine series represents a powerful 11.0L inline-6 heavy-duty diesel platform (10,970 cc) designed specifically to drive mining excavators and heavy crawler bulldozers under continuous, high-load cycles. At the mechanical core of this SOHC overhead-valve (OHV) pushrod timing system is the precision-engineered Komatsu S6D120 camshaft (OEM 6114-41-1110, cross-reference 6114-41-1100, 6110-41-1112, 6110-41-1110), which coordinates critical valve timing and duration. In severe, high-vibration mining shifts, common valve train failure modes include camshaft lobe surface spalling, flat-lobe wear, and woodruff key shearing caused by oil film breakdown or worn solid lifters. To counter these heavy-duty stresses, our dynamically balanced alloy casting camshaft shafts are cast from premium gray iron and finished with CNC precision, with lobe surfaces induction hardened to an elite HRC 52-58 camshaft rating. All bearing journals are CNC ground to precise roundness tolerances to prevent bushing wear during start-ups. Rebuilders must check the camshaft timing gear backlash (standard: 0.030 to 0.120 mm) and inspect the lifter faces during any major overhaul. This specialized engineering preserves original combustion lift and duration, guaranteeing long-term rotation reliability for heavy excavation camshaft applications, including PC400 camshaft, PC450 camshaft, and D85 camshaft heavy fleets.
| Parameter | Value |
|---|---|
| Engine Code | Komatsu S6D120 / SA6D120 / SAA6D120 (11.0L) |
| Configuration | Inline-6 Cylinders, 12 Valves SOHC |
| Engine Cylinder Bore x Stroke | 120.0 mm × 162.0 mm |
| Valve Clearance (Cold) | Intake: 0.30 mm | Exhaust: 0.60 mm |
| Camshaft Thrust Play | 0.050 – 0.220 mm (Wear Limit: 0.30 mm) |
| Timing Gear Backlash | 0.030 – 0.120 mm |
| Material Spec | Premium Induction Hardened Alloy Casting (alloy casting camshaft) |
| Hardness Treatment | Induction Hardened Lobes (HRC 52-58 camshaft) |
| Primary OEM Number | 6114-41-1110 |
| Interchange References | 6114-41-1100, 6110-41-1112, 6110-41-1110 |
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 massive 11.0L SAA6D125 and 15.2L S6D155 lines. Explore our complete range of Komatsu diesel engine parts by visiting our Komatsu Brand Hub or browse other specialized brands in our main Komatsu Camshaft Category.
6114-41-1110, 6114411110 Replacement, D85 Bulldozer Camshaft, Komatsu S6D120 Camshaft, S6D120 Cam Shaft
| Primary Part Number | Cross Ref Part Numbers | Compatible Engine Model | Compatible Machine Model |
|---|---|---|---|
| 6115-21-2211 | 4D130 | D60A Dozer | |
| 6207-41-1111 | 6207-41-1110 | 6D95 | PC200-5 Excavator |
| 6735-41-1111 | 6735411111 | 6D102 | PC200-6 Excavator |
| 6137-41-1120 | 6137411120 | 6D108 | PC300-5 Excavator |
| 6127-41-1103 | 6127-41-1220 | 6D155 | D155A Bulldozer |
| 6210-41-1012 | 6D140 | PC600-7 Excavator | |
| 6150-41-1012 | 6150411012 | 6D125 | PC400-6 Excavator |
| 6745-41-1110 | 6D114 | PC300-7 Excavator | |
| 6222-21-2210 | 6D110 | PC220-3 Excavator | |
| 6754-41-1170 | 6D107 | PC200-8 Excavator | |
| 6137-41-1120 | 6137411120 | 6D105 | PC200-3 Excavator |
| YM129900-14580 | 129900-14580 | 4D94S | FD25 Forklift |
| 6144-41-1110 | S4D94 | PC60-7 Excavator | |
| 6205-41-1300 | 6205411300 | S4D95 | PC120-5 Excavator |
| 6732-41-1111 | 6732411111 | S4D102 / B3.3 | PC128UU Excavator |
| 6207-41-1111 | 6207411111 | S6D95 | PC200-5 Excavator |
| 6735-41-1111 | 6735411111 | S6D102 | PC220-6 Excavator |
| 6222-41-1110 | 6222411110 | S6D108 | PC300-6 Excavator |
| 6150-41-1012 | 6151-41-1010 | S6D125 | D85P Dozer |
| 6128-41-1101 | 6127-41-1102 | S6D155 | D355A Bulldozer |
| 6118-41-1110 | YM123900-14580 | 6D106 | PC130-6 Excavator |
Komatsu camshafts fit heavy machinery including Komatsu PC400 Excavator, Komatsu PC450 Excavator, Komatsu WA470 Wheel Loader, and Komatsu Bulldozers.
Contact us for complete application coverage.
| Make | Machine / Vehicle Model | Year Range | Engine Code | Camshaft OEM |
|---|---|---|---|---|
| Komatsu | PC400-3 / PC400-5 / PC400LC-5 Excavator (PC400 camshaft) | 1985–1998 | S6D120 Inline-6 | 6114-41-1110 |
| Komatsu | PC450-5 / PC450LC-5 Heavy Excavator (PC450 camshaft) | 1993–2001 | SA6D120 Inline-6 | 6114-41-1110 |
| Komatsu | D80A-18 / D80P-18 / D85A-21 / D85P-21 Bulldozer (D85 camshaft) | 1988–1996 | S6D120-1 | 6114-41-1110 |
| Komatsu | Heavy-Duty Construction Gen-Set (heavy excavation camshaft) | 1990–2005 | SAA6D120 | 6114-41-1110 |
Symptom: Metallic ticking sounds from the valve cover, progressive engine timing lag, and a rapid drop in engine lift power under load. (lobe surface spalling)
Diagnosis: Extreme valve spring pressures combined with degraded or contaminated lubricating oil break down the hydrodynamic film between the cam lobes and solid lifters. This causes direct metal-to-metal contact, resulting in progressive spalling and lobe flattening.
Solution: Replace the compromised shaft with our induction hardened alloy casting camshaft (HRC 52-58 lobes) and always install a new set of solid tappets/followers during overhaul.
Symptom: Engine sudden shutdown, complete loss of valve timing coordination, and severe internal valve train damage.
Diagnosis: The S6D120 (OEM 6114-41-1110) and earlier 6114-41-1100 variants share identical camshaft block layouts but utilize slightly different thrust bearing flange profiles and gear lock washer configurations.
Solution: While physical mounting dimensions are identical, always verify whether your gear-train assembly utilizes the newer locking collar before replacing. (6110-41-1110)
Symptom: Loose timing gear connection, rattling sounds from the gear train, or sheared woodruff keys during high-vibration operations. (woodruff key)
Diagnosis: The camshaft timing gear must be securely pressed and keyed onto the shaft flange to prevent timing slip under heavy load torsional vibrations.
Solution: We supply both bare camshafts and complete camshaft-and-driving-gear assemblies. If transferring your old gear, always inspect the keyway for cracks and use a hydraulic press to achieve a standard press-fit clearance with a new woodruff key.
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