Searching 3944158 Cummins 6CT main bearing set? This professional-grade set fits 8.3L engines in Komatsu PC300-6 and Sany SY335 excavators. Prevents bearing spin-out. ISO certified quality. Request quote!
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Cummins 6CT 8.3L main bearing set (OEM: 3944158) with high-load trimetal overlay.
Prevents bearing spin-out in industrial applications. Fits: Komatsu PC300-6, Sany SY335, and Liugong CLG856.
In stock for global export.
The Cummins 8.3L (C-Series) engine is the powerhouse behind thousands of agricultural tractors and excavators worldwide. Maintaining crankshaft alignment in these high-torque applications is non-negotiable. Our Cummins 6CT Main Bearing Sets are precision-engineered to replace OEM 3944158, providing the reliable bottom-end support needed for Case IH Magnum tractors and heavy-duty Komatsu PC300 excavators.
Ruich Value manufactures these bearings using advanced heavy-duty alloys designed to withstand the firing pressures of the 6CTA turbo-diesel platform. We specifically cater to engine rebuilders by offering a complete range of undersize options (.010″ to .040″), ensuring you can salvage reground crankshafts and extend the service life of your fleet equipment cost-effectively.
| Specification | Value |
|---|---|
| Product Type | Main Bearing Set |
| Material Composition | Trimetal (Steel Back, Cu-Pb, Tin Overlay) |
| Engine Platform | Cummins C-Series (6CT 8.3L) |
| Surface Coating | Babbitt / Tin-Lead Flash |
| Dimensional Tolerance | +/- 0.005mm (Precision Match) |
| Fatigue Resistance | Reinforced Steel Back for High Load |
| OEM Reference | 3944158 |
| Cross Reference | 3939626, 3945958, 3929026 |
| Typical Applications | Komatsu PC300-6, Sany SY335, Liugong CLG856, Dongfeng Trucks |
| Application Category | Heavy Construction Machinery & Earthmoving |
| Engine Series | Application Field | Verified Equipment Models |
|---|---|---|
| Cummins 6CTA 8.3 | Agriculture (Tractors) | Case IH Magnum 7110, 7120, 7130, 7140, 7250 |
| Komatsu S6D114 (6CT) | Construction (Excavators) | Komatsu PC300-6, PC350-6, PC360-7, WA380-3 |
| Cummins C8.3 / ISC | Commercial Trucks | Freightliner FL80, Ford F800, Dennis Dart Buses |
Ruich Value supplies a comprehensive range of bottom-end components for Cummins 8.3L engines.
Category coverage: Main Bearing Sets (3944158); Conrod Bearings (3901170); Cam Bushings.
| Engine Model | Item Name | Part No. |
|---|---|---|
| 6BT / EQBT (5.9L) | Main Bearing | 3929016, 3929021, 3901150, 3901306, (3802070 set), 3927772, 4892114/4892715 |
| B Series (3.9L/4.5L) / QSB | Main Bearing | 3978818 / 3978820 / 3978822 (Set), 3977272 |
| B Series (3.9L/4.5L) / QSB | Connecting Rod Bearing | 3969562, 4893693 |
| EQBTA | CAM Bushing | 3971970, 3901090, 3901170 |
| 4BTA390 | Connecting Rod Bearing | 3901170, 3941476 |
| Cummins C (8.3L) | Main BearingMain Bearing | 3944158 / 15/1163, 3945917 |
| Cummins C (8.3L) | Connecting Rod Bearing | 3950661, 3917430 (Standard) |
| Cummins C (8.3L) | Flanged Bearing | 3944163 |
| Cummins C (8.3L) | CAM Bearing | 3943199, 3945329 |
| Cummins C (8.3L) | CAM Bushing | 3913990 |
| Cummins L (10L) | Main Bearing | 3901590, 3919840, 3926798 |
| Cummins L (10L) | Connecting Rod Bearing | 3966344 / 3950661 |
| Cummins D (B Series) | Flanged Bearing | 3978822 / 24 (Thrust Washer Set) |
| ISDe (Cummins Renault D) | CAM Bearing | D4889112 |
| ISDe (Cummins Renault D) | CAM Bushing | D4890059 |
| ISDe (Cummins Renault D) | Rod Bearing | D4893637 |
| Dongfeng Renault (DCI11) | Main Bearing | D5010295445 (Upper), D5010295446 (Lower) |
| Dongfeng Renault (DCI11) | Connecting Rod Bearing | D5010359940 (Upper), D5010477479 (Lower) |
| Dongfeng Renault (DCI11) | Thrust Washers | D5010295448 / D5010295447 |
| QSZ(ISZ)13 | Main Bearing | 4999939 (Upper), 4999940 (Lower) |
| QSZ(ISZ)13 | Connecting Rod Bearing | 4999948 (Upper), 4999949 (Lower) |
| FOTON CUMMINS (3.8L) | Main Bearing | 4948505/4948506 |
| FOTON CUMMINS (3.8L) | Flanged Bearing (Upper/Lower) | 4948507/4948508 |
| FOTON CUMMINS (3.8L) | Connecting Rod Bearing (Upper/Lower) | 4948509/4949510 |
| FOTON CUMMINS (2.8L) | Main Bearing (Upper/Lower) | 4996250/49966251 |
| FOTON CUMMINS (2.8L) | Flanged Bearing | 4946031 |
| FOTON CUMMINS (2.8L) | Connecting Rod Bearing | 5261124 / 5284535 / 5340181 / 5348887 / 5261125 / 5284537 / 5340182 |
| NT855 (13L/15L) | Main Bearing | 3801260 |
| NT855 (13L/15L) | Connecting Rod Bearing | 214950 |
| NT855 | Thrust Washers (Small Hole) | 203660 |
| N14 (NT743/NH220) | Thrust Washers | 3020557 |
| N14 (NT74) | Main Bearing | 3801260 |
| M11 (LT10) | Main Bearing | 3016770 (Upper), 3016780 (Lower) |
| M11 (LT10) | Thrust Washers | 3016760 (Set), 4025125 (Without Flange) |
| KTA(QSK)19 | Main Bearing | 3016760, AR12270A |
| KTA(QSK)19 | Connecting Rod Bearing | 205840 |
| KTA(QSK)19 | Thrust Washers | 205112 |
| KTA(QSK)38 / KTA(QSK)50 | Main Bearing | 3018210 (Standard Set), AR12250 |
| KTA(QSK)38 / KTA(QSK)50 | Connecting Rod Bearing | 3042390 |
| KTA(QSK)38 / KTA(QSK)50 | Thrust Washers | 3000139 |
| QSX(ISX)15 | Main Bearing | 3678555 (Upper), 3678556 / 3800298 (Upper), 4089139 / 4089405 (Lower) |
| QSX(ISX)15 | Connecting Rod Bearing | 4925971 |
| QSX(ISX)15 | Thrust Washers | 4925975 |
A1: Symptom: Low oil pressure, engine knocking, and metal shavings in the oil filter. Diagnosis: In 30-ton excavators like the Komatsu PC300-6, this is usually caused by oil starvation or particulate debris embedding into the bearing layer during high-load digging cycles. Solution: Our 3944158 sets feature a high-performance trimetal overlay that facilitates the embedding of micro-particles, protecting the crankshaft journal from scoring even if minor contamination occurs.
A2: Technical Detail: Main bearing caps must be torqued to specific 6CT factory specs in three sequential steps. Pro-Tip: Always measure the oil clearance using Plastigage; an incorrect clearance—even by 0.02mm—can lead to oil pressure drop and total bearing failure within the first 100 hours of heavy-duty operation.
A3: Diagnosis: The 6CT engine’s high torque output creates extreme compressive stress on the main bearings. Standard bimetal bearings are prone to fatigue delamination. Our Solution: We use a trimetal alloy (steel back + copper-lead layer + tin-lead overlay). This design provides the structural strength to handle the massive firing loads of 8.3L engines in mining machines, preventing the bearing shell from “spinning” or deforming.
Need pricing for Case J944158 replacements or bulk oversize sets? Contact our export team.
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