Komatsu 6156-81-8170 turbocharger for RS400-7 road stabilizer and SAA6D125E-3K engines. Step-gap seals prevent leakage. Workshop and fleet supply ready
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Heavy-duty S400 turbocharger for Komatsu SAA6D125E-3K engines.
Specially engineered for road stabilizers with step-gap dynamic alloy seals to prevent oil bypass at high operational RPMs.
OEM: 6156-81-8170 | Cross-reference: 318714, 323949, 1487-970-0030. Fits Komatsu RS400-7 stabilizers and PC400-7 excavators.
Workshop and fleet supply ready.
The Komatsu SAA6D125E-3K engine is a heavy-duty 11.0L inline-6 industrial workhorse (11,045 cc) designed to deliver immense low-end torque in specialized construction and stabilization machinery. This powerplant is widely utilized in Komatsu RS400-7 soil stabilizers, road recyclers, and PC400-7 / PC450-7 heavy-duty hydraulic excavators operating under severe dust and continuous high-load cycles. To sustain constant combustion efficiency under these grueling conditions, the Komatsu SAA6D125E-3K turbocharger (OEM 6156-81-8170, cross-reference 318714, 323949, 6156-81-8130, 1487-970-0030) utilizes a highly robust, wastegate-calibrated S400 turbocharger system. Every Komatsu S400 turbo and heavy-duty 6D125 turbocharger we manufacture features an advanced turbine wheel cast from high-temperature K18 Inconel alloy to prevent thermal creep and blade deformation when exhaust gas temperatures exceed 750°C. For industrial stabilization fleets, premature oil leakage past the turbine housing and compressor surge are common issues caused by elevated crankcase pressures and rapid load variations. Our replacement assemblies resolve these failure risks by integrating an upgraded 360-degree copper-bronze thrust bearing and advanced step-gap dynamic piston ring seals. Each cartridge undergoes rigorous Vibration Sorting Rig (VSR) balancing at speeds reaching 150,000 RPM, guaranteeing immediate transient boost response and long-term mechanical reliability on Komatsu road stabilizer turbo overhauls.
| Parameter | Value |
|---|---|
| Engine Code | Komatsu SAA6D125E-3K-8M / SAA6D125E-3K (11.045L) |
| Configuration | Inline-6, 24 Valves SOHC |
| Turbocharger Model | S400 Heavy Duty |
| Turbine Wheel Metallurgy | K18 Inconel Alloy (750°C+ rated) |
| Casing Metallurgy | High-Nickel Silicon-Molybdenum Cast Iron |
| Oil Seal Design | Step-Gap Dynamic Piston Ring Seals |
| Thrust Bearing Design | Upgraded 360° Solid Bronze |
| Balancing Specification | VSR Balanced (Up to 150,000 RPM) |
| Primary OEM Number | 6156-81-8170 |
| Interchange References | 318714, 323949, 1487-970-0030, 6156-81-8130 |
Our Komatsu turbine and turbo catalog covers the full medium and heavy-duty inline-6 and multi-cylinder families, from the S6D95 and SAA6D102 up to the high-output S6D140 and SAA6D170 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 Turbo Category.
6156-81-8170, Industrial Fan Turbo, RS400-7 Turbo, S400 Turbocharger, SAA6D125E-3K
| Model | Primary Part Number | Cross Ref Part Numbers | Compatible Engine Model | Compatible Vehicle Model |
|---|---|---|---|---|
| TA3103 | 465636-14 | 465636-5207S, 6207-81-8130, 465636-0207 | S6D95L | PC150-3 WA150 |
| TD04-27W | 4900562 | 4900435, 49377-01600 | 4D102 | !!ALARM_MISSING_MACHINE!! |
| S400 | 6156-81-8150 | 319460, 319448, 6156-818150 | SAA6D125E-3 | WA480 |
| S400 | 6156-81-8170 | 6156-81-8130, 318714, 323949 | SAA6D125E-3K | RS400-7 Industrial Fan |
| T04B59 | 465044-0261 | 6137-82-8200, 465044-5261S, 6137828600 | S6D105 | PC200-3 WA250 WA300 |
| T04B59 | 465044-0251 | 6207-81-8210, 465044-0051, 6207818210 | S6D95L | PC220-5 |
| TA3137 | 700836-0001 | 6207-81-8331, 6209-81-8311, 6207819330 | S6D95L | PC200-6 |
| KTR110-2 | 6505-65-5030 | 6505-61-5030, 6505655030, 6505655091 | SAA6D140E-3N-8 | PC750-6 PC800-7 |
| KTR110-3 | 6505-52-5510 | 6505525510, 6505525510R | S6D170-1 | GENSET S6D170 |
| KTR110 | 6505-55-5090 | 6505555090, R6505555090, 6505-51-7830 | SAA6D140E-2A | HD325-6 Dump Truck |
| H1C | 3522778 | 3525648, 3522777, 3802289, J919121 | 6BTA-590 | Industrial Tractor |
| HX35 | 3595157 | 3596668, 4038475, 6738-81-8090, 6738828220 | 6BTAA | PC200 WA200-250 |
| HX35 | 4037469 | 4955155, 6754-82-8010, 2835695 | SAA6D107E-1 | PC200-8 |
| HX35W | 6754-81-8240 | 4043679, 4955479, 6754818240 | SAA6D107E | GD555-5 WA380-8 |
| HX35 | 3539697 | 6735-81-8201, 3537132, 3539698 | S6D102 | PC220 CD60R |
| HX82 | 3594190 | 5323959, 3592520, 4025026 | QST30 | Generator |
| T04E15 | 466670-0013 | 466670-5013S, 6222-83-8171 | SA6D108 | PC300-6 |
| TO4E08 | 466670-0001 | 6222-83-8170, 6222-81-8210 | S6D95L | PC300-5EXX |
| TD04L | 49377-01700 | 6271-81-8100, 49377-01740, 49377-01770 | SAA4D95LE-5 | PC120-8 PC138US-8 |
| TA3103 | 465636-0206 | 6205-82-8100, 465636-5216S, 6205818120 | S4D95L | PC100 PC120 PC100-5 |
| KTR90 | 6506-21-5010 | 6506215910, 6506-215-910, 6156-81-8150 | KTR90332E | PC400-8 PC450-8 |
| HX25-1W | 4038790 | 3599355, 4089714, 4033351H | SAA4D95LE | PC100/200/128US |
| D155 | 6502-13-2003 | 6502132003, 319319 | S6D155-4-R | D150A EG300 |
| D355 | 6502-12-9004 | 6502-12-9005, 319032, 6502129003 | 4A-S6D155 | D355 Excavator |
| HX30-2W | 3592015 | 3802906, 3537033, 6732-81-8900 | 4BT | Truck Elite Industrial |
| HX30-3 | 6732-81-8100 | 6732-81-8101, 3802749, 3539803 | 4BT-110 | PC100-6 |
| KTR130-3 | 6502-51-5040 | 6502-51-5030, 6240611105 | SAA6D170-E6 | D375-A6 WA600-6 |
| KTR110 | 6505-71-5520 | 6505-71-5040, 6505-68-5540 | SAA6D140E-5H | !!ALARM_MISSING_MACHINE!! |
| TA4532 | 6151-83-8110 | 465105-5010S, 465105-0010 | S6D125 | PC400 PC400-5C |
| TO4B59 | 465044-0225 | 6138-81-8101, 465044-0025 | S6D105 | D66S-1 Offway |
| HX35W | 6738-81-8190 | 6738-81-8191 | S6D102 | PC220-7 |
| TBP417 | 466535-2 | 6222-81-8310, 447450-0082 | SA6D108-1G | WA420-3 |
| HX40W | 4038421 | 4038422, 3538856, 6743-81-8040 | S6D114 | PC300-7 |
| TO4E08 | 466704-0213 | 5222-81-8210, 6151-81-8500 | S6D125 | D85 D65EX-12E |
| S500 | 319179 | 6240-81-8600, 318349, 6240-81-8500 | SAA6D170E | H0465 WA700 |
| KTR110A-1K | 6505116210 | 6505-11-6210, 6505-11-5106 | S6D155 | D155 Excavator |
| HX83 | 4046244 | 4955653, 3798613, 6241-82-8200 | QSK35 | EX1200-6 |
| HX40 | 4038424 | 4038429, 4089965, 3575169 | 6CTA | D61 Bulldozer |
| TO4B59 | 465044-5257S | 465044-0255, 6138-82-8400, 465044-0039 | SA6D110-1A | WA350-1 WA400 EG150-3 |
| HX35W | 4038597 | 4955156, 4042667, 4038209 | QSB Tier-3 | PC200-8 Grader |
Komatsu turbochargers fit heavy machinery including Komatsu RS400-7 Soil Stabilizer, Komatsu PC400-7 Excavator, Komatsu PC450-7 Excavator, and Komatsu SAA6D125E-3K Industrial Gen-Sets.
Contact us for complete application coverage.
| Make | Machine / Vehicle Model | Year Range | Engine Code | Turbo OEM |
|---|---|---|---|---|
| Komatsu | RS400-7 / RS400-7-E0 Soil Stabilizer | 2003–2012 | SAA6D125E-3K | 6156-81-8170 |
| Komatsu | PC400-7 / PC400LC-7 Excavator (PC400-7 turbocharger) | 2003–2010 | SAA6D125E-3K | 6156-81-8170 |
| Komatsu | PC450-7 / PC450LC-7 Excavator (PC450-7 turbo) | 2004–2010 | SAA6D125E-3K | 6156-81-8170 |
| Komatsu | SAA6D125E-3K Industrial Gen-Set | 2005–2015 | SAA6D125E-3K | 6156-81-8170 |
Symptom: RS400-7 soil stabilizers operate under continuous high-idle cycles and heavy dust environments, which often lead to high crankcase pressure and restricted turbocharger oil return. When the oil return line is partially restricted by carbon buildup or sludge, pressurized lube oil cannot escape from the S400 bearing housing fast enough. This forces oil past the turbine-end seals and into the exhaust stream, resulting in blue exhaust smoke. Installing our turbocharger featuring advanced step-gap alloy piston ring seals provides a superior dynamic barrier, preventing oil bypass even under elevated crankcase pressures.
Symptom: Massive exhaust smoke, instant engine choke, or complete flange mounting misalignment during rebuild.
Diagnosis: Although both the 6156-81-8170 and 6156-81-8150 turbochargers fit Komatsu 125 series engines, they are engineered with different wastegate actuator settings and turbine housing A/R (Area/Radius) ratios. The 6156-81-8170 is specialized for the SAA6D125E-3K-8M engine in RS400-7 stabilizers to provide immediate low-end torque for soil blending, whereas the 6156-81-8150 is tuned for the SAA6D125E-3 engine in WA480 loaders and PC400 excavators. They are not direct drop-in interchanges without recalibration.
Symptom: High-pitched squealing, immediate oil seal leak, or shaft seizure within the first few minutes of startup.
Diagnosis: Starting a newly installed turbocharger without pre-lubrication causes immediate metal-to-metal friction on the bronze journal bearings.
Solution: To install the 6156-81-8170 turbocharger securely, clean-room practices are vital to prevent foreign particle ingress into the bearings. Replace all oil supply and return gaskets, ensuring the oil feed line has no internal carbon scaling. Fill the oil inlet port with clean engine oil and manually spin the compressor wheel several times to distribute lubricant across the bronze journal bearings. Torque the mounting flange nuts in sequence to 54 Nm (40 lbf·ft), and crank the engine without starting for 15 seconds to establish initial oil pressure before firing.
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Need a reliable S400 turbo for your RS400-7 or PC400-7? Our precision-balanced units with step-gap dynamic seals are ready for immediate dispatch. Contact us for competitive pricing.
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