Komatsu S6D125-1K Cylinder Block Parts Hub
Komatsu S6D125-1K Cylinder Block Parts is a focused 19PARTS hub for buyers working inside a specific Komatsu engine model and repair system. It is meant to reduce guesswork by tying engine-model navigation to related product listings and part-number references.
Diagram callout lookup for Komatsu S6D125-1K Cylinder Block Parts
Use each diagram together with the table directly below it. The Diagram Ref. column corresponds to the location number shown on that specific image. Clickable part numbers link to matching 19PARTS product pages where a product match exists.
S6D125-1K — Cylinder Block
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 2 | 6150-21-1490 | Bushing,Camshaft | 7 | SN: 10001-UP |
| 5 | 07043-50108 | Plug | 7 | SN: 10001-UP |
| 6 | 07040-12414 | Plug | 1 | SN: 10001-UP |
| 7 | 07002-22434 | O-Ring (K2) | 1 | SN: 10001-UP |
| 9 | 07002-23034 | O-Ring (K2) | 1 | SN: 10001-UP |
| 10 | 04020-01024 | Pin,Dowel | 2 | SN: 10001-UP |
| 13 | 07046-43016 | Plug | 2 | SN: 10001-UP |
| 14 | 07046-44016 | Plug | 1 | SN: 10001-UP |
| 16 | 07046-42816 | Plug | 2 | SN: 10001-UP |
| 19 | 04020-00820 | Pin,Dowel | 12 | SN: 10001-UP |
| 22 | 6150-21-4770 | Pin,Dowel | 2 | SN: 10001-UP |
| 23 | 04020-00514 | Pin,Dowel | 2 | SN: 10001-UP |
| 26 | 01643-31645 | Washer | 14 | SN: 10001-UP |
| 28 | 6150-21-1190 | O-Ring (K2) | 2 | SN: 10001-UP |
| 30 | 07005-01012 | Gasket (K2) | 2 | SN: 10001-UP |
| 32 | 6151-21-1840 | Nozzle,Piston Cooling | 1 | SN: 10001-UP |
| 35 | 6151-21-2220 | Liner,Cylinder | 6 | SN: 10001-UP |
| 36 | 6150-21-2230 | O-Ring,Lower (K2) | 6 | SN: 10001-UP |
| 37 | 6150-21-2240 | O-Ring,Upper (K2) | 6 | SN: 10001-UP |
| 38 | 6150-21-2250 | Seal,Crevice (K2) | 6 | SN: 10001-UP |
| 40 | 07005-01412 | Gasket (K2) | 1 | SN: 10001-UP |
| 43 | 07043-00108 | Plug | 1 | SN: 10001-UP |
| 44 | 08073-00505 | Switch,Pressure | 1 | SN: 10001-UP |
S6D125-1K — Piston And Connecting Rod
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 1 | 6151-31-2111 | Piston | 1 | SN: 10006-10131 |
| 1 | 6151-31-2112 | Piston | 1 | SN: 10132-UP |
| 2 | 6151-31-2410 | Pin,Piston | 1 | SN: 10006-UP |
| 3 | 04065-04818 | Ring,Snap | 2 | SN: 10001-UP |
| 9 | 6150-31-2031 | Piston Ring Ass'Y | 6 | SN: 10132-UP |
| 9 | 6150-31-3130 | Bushing | 1 | SN: 10006-UP |
| 9 | 6151-31-3230 | Bushing | 1 | SN: 10001-10005 |
| 10 | 6150-31-3310 | Bolt | 2 | SN: 10001-UP |
| 10 | 6151-31-2031 | Piston Ring Ass'Y | 6 | SN: 10006-10131 |
| 11 | 02400-10413 | Pin,Dowel | 2 | SN: 10001-UP |
| 11 | 6151-31-2040 | Piston Ring Ass'Y | 6 | SN: 10001-10005 |
| 12 | 6151-36-3040 | Metal Ass'Y | 6 | SN: 10006-UP |
| 12 | 6151-37-3040 | Metal Ass'Y | 6 | SN: 10006-UP |
| 12 | 6151-38-3040 | Metal Ass'Y | 6 | SN: 10006-UP |
| 12 | 6151-39-3040 | Metal Ass'Y | 6 | SN: 10006-UP |
| 18 | 6151-31-3101 | Connecting Rod Ass'Y | 6 | SN: 10006-UP |
| 19 | 6151-31-3200 | Connecting Rod Ass'Y | 6 | SN: 10001-10005 |
| 28 | 6151-31-3040 | Metal Ass'Y | 6 | SN: 10006-UP |
| 29 | 6150-31-3040 | Metal Ass'Y | 6 | SN: 10001-10005 |
S6D125-1K — Front Cover And Front Support
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 4 | 01010-51075 | Bolt | 4 | SN: 10001-UP |
| 5 | 01640-21016 | Washer | 11 | SN: 10001-UP |
| 10 | 6150-21-3230 | Seal, Front (K2) | 1 | SN: 10001-UP |
| 14 | 6150-71-1910 | Seal (K2) | 1 | SN: .-UP |
| 14 | The part specified in the line above can be used instead of this part6610-71-1911 | Seal (K2) | 1 | SN: 10001-. |
| 15 | 6162-73-1960 | Washer (K2) | 1 | SN: 19320-UP |
| 17 | 07000-03030 | O-Ring (K2) | 1 | SN: 10001-UP |
| 19 | 07000-02020 | O-Ring (K2) | 1 | SN: 10001-UP |
| 21 | 01640-21016 | Washer | 1 | SN: 10001-UP |
| 23 | 6130-82-5270 | Gasket (K2) | 1 | SN: 10001-UP |
| 25 | 6150-31-6120 | Bushing | 1 | SN: 10001-UP |
| 29 | 01010-31460 | Bolt | 1 | SN: 10001-UP |
| 39 | 01010-51085 | Bolt | 6 | SN: 10001-UP |
| 41 | 01640-21016 | Washer | 8 | SN: 10001-UP |
| 42 | 09920-00150 | Liquid Gasket,Lg-7, 150G | - | SN: 10001-UP |
| 34A | 01643-50823 | Washer | 6 | SN: 19320-UP |
| 5A | 01010-51075 | Bolt | 1 | SN: 10001-UP |
S6D125-1K — Cylinder Block Cover
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 5 | 6150-21-6710 | Breather | 1 | SN: 10001-UP |
| 6 | 6114-21-5190 | O-Ring (K2) | 1 | SN: 10001-UP |
| 7 | 07286-01963 | Hose,(For Eg200) | 1 | SN: 10001-UP |
| 7 | 07287-01910 | Hose,(For Eg200S) | 1 | SN: 10000-10000 |
| 10 | 6150-21-6460 | O-Ring (K2) | 3 | SN: 10001-UP |
| 12 | 6136-11-8130 | Washer | 9 | SN: 10001-19319 |
| 13 | 6150-21-6390 | Packing (K2) | 9 | SN: 19320-UP |
| 13 | The part specified in the line above can be used instead of this part6136-11-8142 | Packing (K2) | 9 | SN: 10001-19319 |
| 15 | 07281-00609 | Clamp | 2 | SN: 10001-UP |
| 17 | 6136-21-7120 | Cap Ass'Y | 1 | SN: 10001-UP |
| 22 | 01640-21016 | Washer | 2 | SN: 10001-UP |
| 25 | 01640-21016 | Washer | 2 | SN: 10001-UP |
| 26 | 01580-11008 | Nut | 2 | SN: 10001-UP |
S6D125-1K — Crankshaft
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 0 | 6151-31-1010 | Crankshaft Ass'Y | 1 | SN: 10001-UP |
| 2 | 6150-31-1121 | Gear,Crankshaft | 1 | SN: 10001-UP |
| 10 | 04020-01228 | Pin,Dowel | 1 | SN: 10001-UP |
| 12 | 6150-26-8010 | Main Metal Ass'Y | 7 | SN: 10001-UP |
| 12 | 6150-27-8010 | Main Metal Ass'Y | 7 | SN: 10001-UP |
| 12 | 6150-28-8010 | Main Metal Ass'Y | 7 | SN: 10001-UP |
| 12 | 6150-29-8010 | Main Metal Ass'Y | 7 | SN: 10001-UP |
| 14 | 6150-21-8050 | Thrust Metal Ass'Y | 1 | SN: 10001-UP |
| 14 | 6150-28-8050 | Thrust Metal Ass'Y | 1 | SN: 10001-UP |
| 14 | 6150-29-8050 | Thrust Metal Ass'Y | 1 | SN: 10001-UP |
| 16 | 6150-21-8010 | Main Metal Ass'Y | 7 | SN: 10001-UP |
S6D125-1K — Flywheel And Flywheel Housing
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 2 | 6150-21-4770 | Pin,Dowel | 2 | SN: 14019-UP |
| 2 | The part specified in the line above can be used instead of this part6610-21-4570 | Pin,Dowel | 2 | SN: 10001-14018 |
| 3 | 01010-31650 | Bolt | 6 | SN: 10001-UP |
| 4 | 01010-31660 | Bolt | 2 | SN: 10001-UP |
| 5 | 01010-31050 | Bolt | 2 | SN: 10001-UP |
| 7 | 01010-51665 | Bolt | 2 | SN: 10001-UP |
| 9 | 6150-21-4230 | Seal, Rear (K2) | 1 | SN: 10001-UP |
| 13 | The part specified in the line above can be used instead of this part01643-31645 | Washer | 6 | SN: 10001-. |
| 17 | 09920-00150 | Liquid Gasket,Lg-7, 150G | - | SN: 10001-UP |
Shop the Komatsu S6D125-1K Cylinder Block Parts collection
S6D125-1K Cylinder Block Parts lookup notes
Use this hub when the repair has already been narrowed to cylinder block parts. Confirm each part against the engine serial range, parts-book callout, quantity, and option notes before ordering.
Related parent hubs
Featured parts in this hub
- Komatsu Engine Bolt 01010-51085 — SKU KOM-01010-51085 | Bolt
- Komatsu Engine Bolt 01010-51665 — SKU KOM-01010-51665 | Bolt
- Komatsu Engine Bushing 6151-31-3230 — SKU KOM-6151-31-3230 | Bushing
- Komatsu Engine Connecting Rod Ass'Y 6151-31-3200 — SKU KOM-6151-31-3200 | Connecting Rod Ass'Y
- Komatsu Engine Hose 07286-01963 — SKU KOM-07286-01963 | Hose
- Komatsu Engine Hose 07287-01910 — SKU KOM-07287-01910 | Hose
- Komatsu Engine Lever Ass'Y 6150-41-2300 — SKU KOM-6150-41-2300 | Lever Ass'Y
- Komatsu Engine Metal Ass'Y 6150-31-3040 — SKU KOM-6150-31-3040 | Product code 6151-31-3040 | Metal Ass'Y
- Komatsu Engine Nozzle Piston Cooling 6151-21-1840 — SKU KOM-6151-21-1840 | Nozzle Piston Cooling
- Komatsu Engine O-Ring Cylinder Block Cover 6150-21-6460 — SKU KOM-6150-21-6460 | O-Ring Cylinder Block Cover
- Komatsu Engine Piston 6151-31-2111 — SKU KOM-6151-31-2111 | Piston
- Komatsu Engine Piston 6151-31-2112 — SKU KOM-6151-31-2112 | Piston
- Komatsu Engine Piston Ring Ass'Y 6150-31-2031 — SKU KOM-6150-31-2031 | Piston Ring Ass'Y
- Komatsu Engine Piston Ring Ass'Y 6151-31-2031 — SKU KOM-6151-31-2031 | Piston Ring Ass'Y
- Komatsu Engine Piston Ring Ass'Y 6151-31-2040 — SKU KOM-6151-31-2040 | Piston Ring Ass'Y
- Komatsu Engine Rod Push 6150-41-3110 — SKU KOM-6150-41-3110 | Rod Push
- Komatsu Engine Seal Rear 6150-21-4230 — SKU KOM-6150-21-4230 | Seal Rear
Parts-book verification before ordering
Komatsu engine parts often change by engine arrangement, serial range, diagram callout, and option note. 19PARTS uses engine-model organization to help you move from a broad Komatsu part number search into a tighter reference path, but final fitment should always be confirmed against your engine serial number and parts book.
Our Keep Ops Moving approach is simple: give buyers cleaner lookup paths, clear part-number references, and practical cross-navigation so rebuild shops, fleet teams, mechanics, and equipment owners can identify the right components faster.