High-load 3801030 Cummins NT855 main bearing set in stock. Trimetal alloy construction fits Big Cam engines in Kenworth W900 and Komatsu D155. Resists bearing spin-out under peak torque. Request wholesale quote!
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Cummins NT855 Big Cam main bearing set (OEM: 3801030) featuring high-load trimetal overlay.
Prevents bearing spin-out in 14L heavy-duty applications. Fits: Kenworth W900, Peterbilt 379, and Komatsu D155 mining dozers.
In stock for global export.
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 | Value |
|---|---|
| Product Type | Main Bearing Set |
| Material Composition | Trimetal (Steel Back, Copper-Lead, Babbitt Overlay) |
| Engine Platform | Cummins NTA855 Big Cam |
| Surface Coating | Tin-Lead Overlay (Anti-Friction) |
| Dimensional Tolerance | +/- 0.005mm (Precision Match) |
| Fatigue Resistance | High-Strength Steel Backing for Heavy Haul |
| OEM Reference | 3801030 |
| Cross Reference | 3044439, 3066880, 206600, 3608833 |
| Typical Applications | Kenworth W900, Peterbilt 379, Komatsu D155, C300 D5 Genset |
| Application Category | Heavy-Duty Mining, Logistics & Power Generation |
| 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 |
A1: Symptom: Low oil pressure, engine knock, and metal debris in oil filters. Diagnosis: In 14L engines like the Komatsu D155, excessive torsion or lack of lubrication at startup leads to bearing “spin-out” or overlay wipe. Solution: Our 3801030 trimetal bearings utilize a high-density copper-lead layer that resists deformation under the peak firing pressures inherent in Big Cam engines.
A2: Technical Detail: Main cap torque must be applied to 405 Nm (300 ft-lb) in a strict sequence, and end play must be verified to 0.18mm – 0.46mm. Pro-Tip: Never mix old bearing shells with new ones; always replace the entire set to ensure uniform oil clearance across all main journals.
A3: Diagnosis: Mining and heavy-haul applications put extreme cyclic stress on the crankshaft journals. Our Solution: The steel back provides structural support, the copper-lead layer handles the high-load capacity, and the babbitt overlay provides “embeddability” for small contaminants. This combination prevents the crankshaft from being scored if the oil filtering system is bypassed during extreme duty.
Need pricing for OEM 3801030 sets or specific undersizes for Komatsu dozers? Contact our export team.
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