Komatsu S6D125-1C Cylinder Block Parts Hub
Komatsu S6D125-1C 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 S6D125-1C 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.
S6D125-1C — Piston And Connecting Rod
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 1 | 6151-31-2111 | Piston | 6 | SN: 10006-10131 |
| 1 | 6151-31-2112 | Piston | 6 | SN: 10132-23598 |
| 1 | 6151-31-2150 | Piston | 6 | SN: 23599-UP |
| 2 | 6151-31-2410 | Pin,Piston | 6 | SN: 10006-23598 |
| 2 | 6151-31-2420 | Pin,Piston | 6 | SN: 23599-UP |
| 3 | 04065-04818 | Ring,Snap | 12 | SN: 10001-UP |
| 8 | 6150-31-2033 | Piston Ring Ass'Y | 6 | SN: 45949-UP |
| 9 | 6150-31-3130 | Bushing | 1 | SN: 10006-23598 |
| 9 | 6151-31-3230 | Bushing | 1 | SN: 23599-UP |
| 9 | 6151-31-3230 | Bushing | 1 | SN: 10001-10005 |
| 9 | The part specified in the line above can be used instead of this part6150-31-2032 | Piston Ring Ass'Y | 6 | SN: 13464-45948 |
| 10 | 6150-31-3310 | Bolt | 2 | SN: 10001-UP |
| 10 | The part specified in the line above can be used instead of this part6150-31-2031 | Piston Ring Ass'Y | 6 | SN: 10132-13463 |
| 11 | 02400-10413 | Pin,Dowel | 2 | SN: 10001-UP |
| 11 | 6151-31-2031 | Piston Ring Ass'Y | 6 | SN: 10006-10131 |
| 12 | 6151-36-3040 | Metal Ass'Y | 6 | SN: 10006-23598 |
| 12 | 6151-37-3040 | Metal Ass'Y | 6 | SN: 10006-23598 |
| 12 | 6151-38-3040 | Metal Ass'Y | 6 | SN: 10006-23598 |
| 12 | 6151-39-3040 | Metal Ass'Y | 6 | SN: 10006-23598 |
| 12 | The part specified in the line above can be used instead of this part6151-31-2040 | Piston Ring Ass'Y | 6 | SN: 10001-10005 |
| 20 | 6151-31-3200 | Connecting Rod Ass'Y | 6 | SN: 23599-UP |
| 21 | 6151-31-3101 | Connecting Rod Ass'Y | 6 | SN: 10006-23598 |
| 22 | 6151-31-3200 | Connecting Rod Ass'Y | 6 | SN: 10001-10005 |
| 33 | 6150-31-3040 | Metal Ass'Y | 6 | SN: 23599-UP |
| 34 | 6151-31-3040 | Metal Ass'Y | 6 | SN: 10006-23598 |
| 35 | 6150-31-3040 | Metal Ass'Y | 6 | SN: 10001-10005 |
S6D125-1C — Cylinder Block
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 2 | 6150-21-1490 | Bushing,Camshaft | 7 | SN: 10001-UP |
| 6 | 01643-31645 | Washer | 14 | SN: 10001-UP |
| 7 | 07043-00108 | Plug | 7 | SN: 10001-UP |
| 8 | 07040-12414 | Plug | 1 | SN: 10001-UP |
| 9 | 07002-22434 | O-Ring (K2) | 1 | SN: 10001-UP |
| 11 | 07002-23034 | O-Ring (K2) | 1 | SN: 10001-UP |
| 13 | 07046-43016 | Plug | 2 | SN: 10001-UP |
| 14 | 07046-44016 | Plug | 1 | SN: 10001-UP |
| 17 | 07043-00211 | Plug | 4 | SN: 10001-UP |
| 18 | 04020-00820 | Pin,Dowel | 12 | SN: 10001-UP |
| 21 | 04020-00514 | Pin,Dowel | 2 | SN: 10001-UP |
| 25 | 04020-01024 | Pin,Dowel | 2 | SN: 10001-UP |
| 26 | 6150-21-4770 | Pin,Dowel | 2 | SN: 10001-UP |
| 28 | 07005-01412 | Gasket (K2) | 1 | SN: 10001-UP |
| 30 | 07005-01012 | Gasket (K2) | 2 | SN: 29383-UP |
| 30 | 07005-01012 | Gasket | 2 | SN: 10001-29382 |
| 31 | 07046-42816 | Plug | 1 | SN: 10001-UP |
| 33 | 6150-21-1190 | O-Ring (K2) | 2 | SN: 10001-UP |
| 36 | 6151-21-1840 | Nozzle,Piston Cooling | 1 | SN: 10001-23598 |
| 39 | 6151-21-2220 | Liner,Cylinder | 6 | SN: 10001-UP |
| 40 | 6150-21-2230 | O-Ring,Lower (K2) | 6 | SN: 10001-UP |
| 41 | 6150-21-2240 | O-Ring,Upper (K2) | 6 | SN: 10001-UP |
| 42 | 6150-21-2250 | Seal,Crevice (K2) | 6 | SN: 10001-UP |
S6D125-1C — 2)
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 3 | 01010-30820 | Bolt | 6 | SN: 10001-UP |
| 7 | 6631-21-4650 | Spacer | 1 | SN: 10001-UP |
| 9 | 07000-63088 | O-Ring (K3) | 1 | SN: 10001-UP |
| 10 | 06000-06208 | Bearing,Ball | 1 | SN: 10001-UP |
| 11 | 04064-04018 | Ring,Snap | 1 | SN: 10001-UP |
| 13 | 07000-02085 | O-Ring (K3) | 1 | SN: 10001-UP |
| 17 | 07000-62095 | O-Ring (K3) | 1 | SN: 10001-UP |
| 18 | 06000-06209 | Bearing,Ball | 1 | SN: 10001-UP |
| 19 | 04065-08530 | Ring,Snap | 1 | SN: 10001-UP |
| 20 | 04064-04518 | Ring,Snap | 1 | SN: 10001-UP |
| 23 | 07000-02085 | O-Ring (K3) | 1 | SN: 10001-UP |
| 26 | 07000-02105 | O-Ring (K3) | 1 | SN: 10001-UP |
| 29 | 6631-21-4520 | Gear | 1 | SN: 10001-UP |
| 34 | 06001-00213 | Bearing,Roller | 1 | SN: 10001-UP |
| 35 | 01530-06214 | Nut | 1 | SN: 10001-UP |
| 36 | 01658-26223 | Washer,Lock (K3) | 1 | SN: 10001-UP |
| 38 | 07000-65110 | O-Ring (K3) | 1 | SN: 10001-UP |
| 42 | 06000-06214 | Bearing,Ball | 1 | SN: 10001-UP |
| 43 | 04065-01240 | Ring,Snap | 1 | SN: 10001-UP |
| 46 | 07000-02105 | O-Ring (K3) | 1 | SN: 10001-UP |
S6D125-1C — Front Cover And Gear
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 4 | 01010-51075 | Bolt | 6 | SN: 10001-UP |
| 5 | 01640-21016 | Washer | 17 | SN: 10001-UP |
| 5 | 01640-21016 | Washer,(Cold Terrain Spec.) | 18 | SN: 10001-UP |
| 10 | 6150-21-3230 | Seal, Front (K2) | 1 | SN: 10001-UP |
| 14 | 6150-71-1910 | Seal (K2) | 1 | SN: 18598-UP |
| 14 | The part specified in the line above can be used instead of this part6610-71-1911 | Seal (K2) | 1 | SN: 10001-18597 |
| 15 | 6162-73-1960 | Washer,Felt (K2) | 1 | SN: 20660-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 |
| 24 | 6130-82-5270 | Gasket (K2) | 1 | SN: 10001-UP |
| 26 | 6150-31-6120 | Bushing | 1 | SN: 10001-UP |
| 30 | 01010-31460 | Bolt | 1 | SN: 10001-UP |
| 33 | 6150-31-6220 | Bushing | 2 | SN: 10001-UP |
| 35 | 01010-31030 | Bolt | 6 | SN: 43964-UP |
| 40 | 01640-21016 | Washer | 2 | SN: 10001-10103 |
| 41 | 09920-00150 | Liquid Gasket,Lg-7, 150G | - | SN: 10001-UP |
| 35A | 01643-50823 | Washer | 6 | SN: 29848-43963 |
S6D125-1C — 2)
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 2 | 6631-21-4371 | Bushing | 1 | SN: 10001-UP |
| 4 | 07000-02010 | O-Ring (K3) | 1 | SN: 10001-UP |
| 8 | 6631-21-4440 | Gear | 1 | SN: 10001-UP |
| 11 | 01050-31045 | Bolt | 6 | SN: 10001-UP |
| 13 | 6631-21-4421 | Case,Bearing | 1 | SN: 10001-UP |
| 14 | 6631-21-4870 | O-Ring (K3) | 1 | SN: 10001-UP |
| 15 | 06001-00213 | Bearing,Roller | 1 | SN: 10001-UP |
| 16 | 01530-06214 | Nut | 1 | SN: 10001-UP |
| 17 | 01658-26223 | Washer,Lock (K3) | 1 | SN: 10001-UP |
| 18 | 6631-21-4431 | Cover | 1 | SN: 10001-UP |
| 19 | 07000-65110 | O-Ring (K3) | 1 | SN: 10001-UP |
| 23 | 06000-06213 | Bearing,Ball | 1 | SN: 10001-UP |
| 24 | 04064-06525 | Ring,Snap | 1 | SN: 10001-UP |
| 30 | 07000-02105 | O-Ring (K3) | 1 | SN: 10001-UP |
| 3A | 04020-00514 | Pin,Dowel | 1 | SN: 30696-UP |
S6D125-1C — Cylinder Block Cover
| Diagram Ref. | Part Number | Description | Qty | Serial / Option Notes |
|---|---|---|---|---|
| 3 | 6150-21-6710 | Breather | 1 | SN: 10001-UP |
| 4 | 6114-21-5190 | O-Ring (K2) | 1 | SN: 10001-UP |
| 5 | 07286-01963 | Hose | 1 | SN: 10001-UP |
| 8 | 6150-21-6450 | Gasket (K2) | 3 | SN: 38811-UP |
| 8 | The part specified in the line above can be used instead of this part6150-21-6460 | O-Ring (K2) | 3 | SN: 10001-38810 |
| 10 | 6136-11-8130 | Washer | 9 | SN: 10001-29382 |
| 11 | 6150-21-6390 | Packing (K2) | 9 | SN: 29383-UP |
| 11 | The part and the part specified in the line immediately above are interchangeable.6136-11-8142 | Packing (K2) | 9 | SN: 10001-29382 |
| 13 | 07281-00609 | Clamp | 2 | SN: 10001-UP |
| 15 | 6136-21-7120 | Cap Ass'Y | 1 | SN: 10001-UP |
| 20 | 01640-21016 | Washer | 2 | SN: 10001-UP |
| 23 | 01640-21016 | Washer | 2 | SN: 10001-UP |
| 24 | 01580-11008 | Nut | 2 | SN: 10001-UP |
Shop the Komatsu S6D125-1C Cylinder Block Parts collection
S6D125-1C 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 Ball Bearing 06000-06214 — SKU KOM-06000-06214 | Ball Bearing
- Komatsu Engine Bearing Ball 06000-06208 — SKU KOM-06000-06208 | Bearing Ball
- Komatsu Engine Bearing Ball 06000-06209 — SKU KOM-06000-06209 | Bearing Ball
- Komatsu Engine Bearing Ball 06000-06213 — SKU KOM-06000-06213 | Bearing Ball
- Komatsu Engine Bearing Roller 06001-00213 — SKU KOM-06001-00213 | Bearing Roller
- Komatsu Engine Bolt 01010-31670 — SKU KOM-01010-31670 | Bolt
- Komatsu Engine Bolt 01050-31045 — SKU KOM-01050-31045 | Bolt
- Komatsu Engine Bushing 6151-31-3230 — SKU KOM-6151-31-3230 | Bushing
- Komatsu Engine Bushing 6631-21-4371 — SKU KOM-6631-21-4371 | Bushing
- Komatsu Engine Case Bearing 6631-21-4421 — SKU KOM-6631-21-4421 | Product code 6150-21-4860 | Case Bearing
- Komatsu Engine Connecting Rod Ass'Y 6151-31-3200 — SKU KOM-6151-31-3200 | Connecting Rod Ass'Y
- Komatsu Engine Cover 6631-21-4431 — SKU KOM-6631-21-4431 | Cover
- Komatsu Engine Crankshaft Ass'Y 6151-31-1010 — SKU KOM-6151-31-1010 | Product code 6151-31-1110 | Crankshaft Ass'Y
- Komatsu Engine Gear 6631-21-4440 — SKU KOM-6631-21-4440 | Gear
- Komatsu Engine Gear 6631-21-4520 — SKU KOM-6631-21-4520 | Gear
- Komatsu Engine Gear Crankshaft 6150-31-1121 — SKU KOM-6150-31-1121 | Gear Crankshaft
- Komatsu Engine Hose 07286-01963 — SKU KOM-07286-01963 | Hose
- Komatsu Engine Lever Ass'Y 6150-41-2300 — SKU KOM-6150-41-2300 | Lever Ass'Y
- Komatsu Engine Liner Cylinder 6151-21-2220 — SKU KOM-6151-21-2220 | Liner Cylinder
- 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 Nut 01530-06214 — SKU KOM-01530-06214 | Nut
- Komatsu Engine O-Ring 07000-02010 — SKU KOM-07000-02010 | O-Ring
- Komatsu Engine O-Ring 07000-63088 — SKU KOM-07000-63088 | O-Ring
- Komatsu Engine O-Ring 07000-65110 — SKU KOM-07000-65110 | O-Ring
- Komatsu Engine O-Ring 6631-21-4870 — SKU KOM-6631-21-4870 | O-Ring
- Komatsu Engine Packing Camfollower Cover Bolt 6150-21-6390 — SKU KOM-6150-21-6390 | Packing Camfollower Cover Bolt
- Komatsu Engine Pin Piston 6151-31-2420 — SKU KOM-6151-31-2420 | Pin Piston
- Komatsu Engine Piston 6151-31-2111 — SKU KOM-6151-31-2111 | Piston
- Komatsu Engine Piston 6151-31-2112 — SKU KOM-6151-31-2112 | Piston
This hub includes 41 linked product listings. Use the collection link above to browse the full set.
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.