Komatsu S6D125-1S Cylinder Block Parts Hub
Komatsu S6D125-1S 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 S6D125-1S 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.
S6D125-1S — Cylinder Block
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 2 | 6150-21-1490 | Bushing,Camshaft | 7 | SN: 13137-UP |
| 6 | 01643-31645 | Washer | 14 | SN: 13137-UP |
| 7 | 07043-50108 | Plug | 7 | SN: 13137-UP |
| 8 | 07040-12414 | Plug | 1 | SN: 13137-UP |
| 9 | 07002-22434 | O-Ring (K2) | 1 | SN: 13137-UP |
| 11 | 07002-23034 | O-Ring (K2) | 1 | SN: 13137-UP |
| 13 | 07046-43016 | Plug | 2 | SN: 13137-UP |
| 14 | 07046-44016 | Plug | 1 | SN: 13137-UP |
| 18 | 04020-00820 | Pin,Dowel | 12 | SN: 13137-UP |
| 22 | 07005-01412 | Gasket (K2) | 1 | SN: 13137-UP |
| 23 | 04020-00514 | Pin,Dowel | 2 | SN: 13137-UP |
| 27 | 04020-01024 | Pin,Dowel | 2 | SN: 13137-UP |
| 28 | 6150-21-4770 | Pin,Dowel | 2 | SN: 13137-UP |
| 30 | 07005-01012 | Gasket (K2) | 2 | SN: 13137-UP |
| 33 | 6151-21-1840 | Nozzle,Piston Cooling | 6 | SN: 13137-23688 |
| 36 | 6151-21-2220 | Liner,Cylinder | 6 | SN: 13137-UP |
| 37 | 6150-21-2230 | O-Ring,Lower (K2) | 6 | SN: 13137-UP |
| 38 | 6150-21-2240 | O-Ring,Upper (K2) | 6 | SN: 13137-UP |
| 39 | 6150-21-2250 | Seal,Crevice (K2) | 6 | SN: 13137-UP |
| 41 | 6150-21-1190 | O-Ring (K2) | 2 | SN: 13137-UP |
| 42 | 07046-42816 | Plug | 1 | SN: 13137-UP |
| 43 | 7861-99-1300 | Sensor,Oil Pressure | 1 | SN: 13137-UP |
| 46 | 01640-21016 | Washer | 1 | SN: 31113-UP |
S6D125-1S — Cylinder Block
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 2 | 6150-21-1490 | Bushing,Camshaft | 7 | SN: 13137-UP |
| 6 | 01643-31645 | Washer | 14 | SN: 13137-UP |
| 7 | 07043-50108 | Plug | 7 | SN: 13137-UP |
| 8 | 07040-12414 | Plug | 1 | SN: 13137-UP |
| 9 | 07002-22434 | O-Ring (K2) | 1 | SN: 13137-UP |
| 11 | 07002-23034 | O-Ring (K2) | 1 | SN: 13137-UP |
| 13 | 07046-43016 | Plug | 2 | SN: 13137-UP |
| 14 | 07046-44016 | Plug | 1 | SN: 13137-UP |
| 18 | 04020-00820 | Pin,Dowel | 12 | SN: 13137-UP |
| 22 | 07005-01412 | Gasket (K2) | 1 | SN: 13137-UP |
| 23 | 04020-00514 | Pin,Dowel | 2 | SN: 13137-UP |
| 27 | 04020-01024 | Pin,Dowel | 2 | SN: 13137-UP |
| 28 | 6150-21-4770 | Pin,Dowel | 2 | SN: 13137-UP |
| 30 | 07005-01012 | Gasket (K2) | 2 | SN: 13137-UP |
| 33 | 6151-21-1840 | Nozzle,Piston Cooling | 6 | SN: 13137-23688 |
| 36 | 6151-21-2220 | Liner,Cylinder | 6 | SN: 13137-UP |
| 37 | 6150-21-2230 | O-Ring,Lower (K2) | 6 | SN: 13137-UP |
| 38 | 6150-21-2240 | O-Ring,Upper (K2) | 6 | SN: 13137-UP |
| 39 | 6150-21-2250 | Seal,Crevice (K2) | 6 | SN: 13137-UP |
| 41 | 6150-21-1190 | O-Ring (K2) | 2 | SN: 13137-UP |
| 42 | 07046-42816 | Plug | 1 | SN: 13137-UP |
| 43 | 7861-99-1300 | Sensor,Oil Pressure | 1 | SN: 13137-UP |
| 46 | 01640-21016 | Washer | 1 | SN: 31113-UP |
S6D125-1S — Piston And Connecting Rod
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 1 | 6151-31-2112 | Piston | 6 | SN: 13137-23688 |
| 1 | 6151-31-2171 | Piston | 6 | SN: 23689-UP |
| 2 | 6151-31-2410 | Pin,Piston | 6 | SN: 13137-23688 |
| 2 | 6151-31-2420 | Pin,Piston | 6 | SN: 23689-UP |
| 3 | 04065-04818 | Ring,Snap | 12 | SN: 13137-UP |
| 4 | 6150-31-2032 | Piston Ring Ass'Y | 6 | SN: 17479-UP |
| 4 | The part specified in the line above can be used instead of this part6150-31-2031 | Piston Ring Ass'Y | 6 | SN: 13137-17478 |
| 7 | 6151-31-3101 | Connecting Rod Ass'Y | 6 | SN: 13137-23688 |
| 7 | 6151-31-3200 | Connecting Rod Ass'Y | 6 | SN: 23689-UP |
| 9 | 6150-31-3130 | Bushing | 1 | SN: 13137-23688 |
| 9 | 6151-31-3230 | Bushing | 1 | SN: 23689-UP |
| 10 | 6150-31-3310 | Bolt | 2 | SN: 13137-UP |
| 11 | 02400-10413 | Pin,Dowel | 2 | SN: 13137-UP |
| 12 | 6150-31-3040 | Metal Ass'Y | 6 | SN: 23689-UP |
| 12 | 6151-31-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
| 12 | 6151-36-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
| 12 | 6151-37-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
| 12 | 6151-38-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
| 12 | 6151-39-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
S6D125-1S — Piston And Connecting Rod
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 1 | 6151-31-2112 | Piston | 6 | SN: 13137-23688 |
| 1 | 6151-31-2171 | Piston | 6 | SN: 23689-UP |
| 2 | 6151-31-2410 | Pin,Piston | 6 | SN: 13137-23688 |
| 2 | 6151-31-2420 | Pin,Piston | 6 | SN: 23689-UP |
| 3 | 04065-04818 | Ring,Snap | 12 | SN: 13137-UP |
| 4 | 6150-31-2032 | Piston Ring Ass'Y | 6 | SN: 17479-UP |
| 4 | The part specified in the line above can be used instead of this part6150-31-2031 | Piston Ring Ass'Y | 6 | SN: 13137-17478 |
| 7 | 6151-31-3101 | Connecting Rod Ass'Y | 6 | SN: 13137-23688 |
| 7 | 6151-31-3200 | Connecting Rod Ass'Y | 6 | SN: 23689-UP |
| 9 | 6150-31-3130 | Bushing | 1 | SN: 13137-23688 |
| 9 | 6151-31-3230 | Bushing | 1 | SN: 23689-UP |
| 10 | 6150-31-3310 | Bolt | 2 | SN: 13137-UP |
| 11 | 02400-10413 | Pin,Dowel | 2 | SN: 13137-UP |
| 12 | 6150-31-3040 | Metal Ass'Y | 6 | SN: 23689-UP |
| 12 | 6151-31-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
| 12 | 6151-36-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
| 12 | 6151-37-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
| 12 | 6151-38-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
| 12 | 6151-39-3040 | Metal Ass'Y | 6 | SN: 13137-23688 |
S6D125-1S — Flywheel And Flywheel Housing (With Pick-Up Sensor)
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 2 | 6150-21-4770 | Pin,Dowel | 2 | SN: 21727-UP |
| 2 | The part specified in the line above can be used instead of this part6610-21-4570 | Pin,Dowel | 2 | SN: 13137-21726 |
| 3 | 07043-70211 | Plug | 1 | SN: 13137-17921 |
| 4 | 07044-12412 | Plug | 1 | SN: 13137-UP |
| 5 | 07002-02434 | O-Ring (K2) | 1 | SN: 13137-UP |
| 6 | 01010-31650 | Bolt | 6 | SN: 13137-UP |
| 7 | 01010-31660 | Bolt | 2 | SN: 13137-UP |
| 8 | 01010-31050 | Bolt | 2 | SN: 13137-UP |
| 9 | 6150-21-4250 | Seal¤ Rear (K2) | 1 | SN: 19177-33681 |
| 9 | 6150-21-4250 | Seal¤ Rear | 1 | SN: 18854-19176 |
| 13 | 01643-31645 | Washer | 6 | SN: 13137-UP |
| 17 | 7819-11-2310 | Sensor,Pick-Up | 1 | SN: 13137-UP |
| 18 | 07005-02216 | Gasket (K2) | 1 | SN: 13137-UP |
| 21 | 09920-00150 | Liquid Gasket,Lg-7¤ 150G | - | SN: 13137-UP |
S6D125-1S — Flywheel And Flywheel Housing (With Pick-Up Sensor)
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 2 | 6150-21-4770 | Pin,Dowel | 2 | SN: 21727-UP |
| 2 | The part specified in the line above can be used instead of this part6610-21-4570 | Pin,Dowel | 2 | SN: 13137-21726 |
| 3 | 07043-70211 | Plug | 1 | SN: 13137-17921 |
| 4 | 07044-12412 | Plug | 1 | SN: 13137-UP |
| 5 | 07002-02434 | O-Ring (K2) | 1 | SN: 13137-UP |
| 6 | 01010-31650 | Bolt | 6 | SN: 13137-UP |
| 7 | 01010-31660 | Bolt | 2 | SN: 13137-UP |
| 8 | 01010-31050 | Bolt | 2 | SN: 13137-UP |
| 9 | 6150-21-4250 | Seal¤ Rear (K2) | 1 | SN: 19177-33681 |
| 9 | 6150-21-4250 | Seal¤ Rear | 1 | SN: 18854-19176 |
| 13 | 01643-31645 | Washer | 6 | SN: 13137-UP |
| 17 | 7819-11-2310 | Sensor,Pick-Up | 1 | SN: 13137-UP |
| 18 | 07005-02216 | Gasket (K2) | 1 | SN: 13137-UP |
| 21 | 09920-00150 | Liquid Gasket,Lg-7¤ 150G | - | SN: 13137-UP |
Shop the Komatsu S6D125-1S Cylinder Block Parts collection
S6D125-1S 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 01010-50612 — SKU KOM-01010-50612 | 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 07286-01990 — SKU KOM-07286-01990 | Hose
- 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 O-Ring Oil Filter Mounting 07000-62055 — SKU KOM-07000-62055 | O-Ring Oil Filter Mounting
- Komatsu Engine Pin Piston 6151-31-2420 — SKU KOM-6151-31-2420 | Pin Piston
- Komatsu Engine Piston 6151-31-2112 — SKU KOM-6151-31-2112 | Piston
- Komatsu Engine Piston 6151-31-2171 — SKU KOM-6151-31-2171 | Product code 6151-31-2510 | Piston
- Komatsu Engine Piston Ring Ass'Y 6150-31-2032 — SKU KOM-6150-31-2032 | Piston Ring Ass'Y
- Komatsu Engine Plug 07044-12412 — SKU KOM-07044-12412 | Plug
- Komatsu Engine Seal¤ Rear 6150-21-4250 — SKU KOM-6150-21-4250 | Product code 6151-21-4160 | Seal¤ Rear
- Komatsu Engine Sensor Engine Revolution 7819-11-2310 — SKU KOM-7819-11-2310 | Sensor Engine Revolution
- Komatsu Engine Sensor Oil Level 7861-91-4210 — SKU KOM-7861-91-4210 | Sensor Oil Level
- Komatsu Engine Sensor Oil Pressure 7861-99-1300 — SKU KOM-7861-99-1300 | Sensor Oil Pressure
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.