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The crankshaft is the heart of the Cummins NT855, and maintaining oil pressure is critical for these legacy workhorses. Our Big Cam Main Bearing Sets are engineered to replace OEM 3801030, providing the heavy-duty support needed for engines that have clocked over a million miles. Whether powering a Komatsu D85 bulldozer or a classic International Transtar, these bearings restore the bottom-end stability essential for high-torque output.
Ruich Value utilizes an advanced Copper-Lead Tri-Metal composition that excels in “embeddability”—the ability to absorb debris in older lubrication systems. Recognizing that most 855 crankshafts today are reground, we specialize in supplying a full range of undersize options (.010″ through .040”), making this set the go-to solution for engine rebuilders and fleet maintenance managers worldwide.
| Specification | Details |
|---|---|
| OEM Part Numbers (Set) | 3801030, AR12199, 3016770 (Shell Ref) |
| Cross Reference (Komatsu) | 6127-21-8010, 6127-21-8000 (Fits S6D155) |
| Engine Compatibility | Cummins NT855, Big Cam I, II, III; NTA855 |
| Material Composition | Tri-Metal (Steel Back + Copper-Lead + Babbitt Overlay) |
| Journal Diameter | 114.30 mm (4.500 in) – Standard |
| Kit Contents | Upper Shells, Lower Shells (Thrust Washers sold separately or in kit depending on spec) |
| Key Features | • Precision wall thickness for consistent oil clearance • High load capacity for construction duty cycles • Available in STD, .010, .020, .030, .040 sizes |
| Engine Series | Application Field | Verified Equipment Models |
|---|---|---|
| Komatsu S6D155 (NT855) | Construction (Dozers) | Komatsu D85A-18, D85E-21, D155A-1, D355A |
| Cummins Big Cam III | Heavy Trucks (Classic) | International Transtar 4300, Kenworth W900A, Mack Super-Liner |
| Cummins NTA855-M | Marine & Industrial | Marine Tugs, Ingersoll Rand Portable Compressors |
Ruich Value supplies a comprehensive catalog of bearings for classic and modern Cummins engines.
Category coverage: NT855 (Big Cam); N14 Celect; KTA19/38/50; V28; NH220.
| 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 |
Need pricing for OEM 3801030 sets or specific undersizes for Komatsu dozers? Contact our export team.
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