Komatsu Engine Timing Gear and Front Cover Parts Hub

Komatsu Engine Timing Gear and Front Cover Parts brings together Komatsu engine listings by major repair system. This helps buyers who know the engine area they are working in but still need to confirm the exact part number, product code, diagram context, or related engine model.

Diagram callout lookup for Komatsu Engine Timing Gear and Front Cover 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.

SA6D155-4A — Gear Case And Cover

Komatsu Engine Timing Gear and Front Cover Parts diagram ENGINES/sa6d155c/060020a.png
ENGINES/sa6d155c/060020a.png · 32 listed callout rows
Diagram Ref. Part Number Description Qty Serial / Option Notes
2 04020-01434 Pin,Dowel 2 SN: 50816-UP
3 04020-00616 Pin,Dowel 2 SN: 50816-UP
8 01582-01008 Nut 6 SN: 50816-UP
9 01602-01030 Washer,Spring 6 SN: 50816-UP
10 6127-21-3160 Grommet (K2) 2 SN: 50816-UP
11 6128-21-3811 Gasket (K2) 1 SN: 55407-UP
11 The part specified in the line above can be used instead of this part6128-21-3810 Gasket (K2) 1 SN: 50816-55406
12 01010-31650 Bolt 15 SN: 50816-UP
13 01602-01648 Washer,Spring 15 SN: 50816-UP
18 04020-00820 Pin,Dowel 1 SN: 50816-UP
20 01643-31032 Washer 6 SN: 52039-UP
23 6127-31-6221 Bushing 1 SN: 50816-UP
24 6127-31-6261 Metal,Thrust 1 SN: 50816-UP
25 6128-21-3231 Gasket (K2) 1 SN: 55407-UP
25 The part specified in the line above can be used instead of this part6128-21-3230 Gasket (K2) 1 SN: 50816-55406
26 01010-61475 Bolt 11 SN: 58830-UP
26 The part specified in the line above can be used instead of this part01010-31475 Bolt 11 SN: 50816-58829
27 01010-61455 Bolt 4 SN: 58830-UP
27 The part specified in the line above can be used instead of this part01010-31455 Bolt 4 SN: 50816-58829
28 01010-61480 Bolt 2 SN: 58830-UP
28 The part specified in the line above can be used instead of this part01010-31480 Bolt 2 SN: 50816-58829
29 01602-01442 Washer,Spring 17 SN: 50816-UP
30 01011-61625 Bolt 2 SN: 58830-UP
31 01602-01648 Washer,Spring 2 SN: 50816-UP
32 01641-21423 Washer 2 SN: 50816-UP
34 01010-80612 Bolt 2 SN: 57471-UP
35 01602-00619 Washer,Spring 2 SN: 50816-UP
36 01642-20608 Washer 2 SN: 50816-UP
38 01010-61440 Bolt 2 SN: 58830-UP
38 The part specified in the line above can be used instead of this part01010-31440 Bolt 2 SN: 50816-58829
39 01602-01442 Washer,Spring 2 SN: 50816-UP
40 6127-21-3510 Seal, Front (K2) 1 SN: 50816-UP

S6D155-4AA — Gear Case And Front Support

Komatsu Engine Timing Gear and Front Cover Parts diagram ENGINES/s6d1554c/060030a.png
ENGINES/s6d1554c/060030a.png · 33 listed callout rows
Diagram Ref. Part Number Description Qty Serial / Option Notes
2 04020-01434 Pin,Dowel 1 SN: 25887-UP
3 04020-01434 Pin,Dowel 1 SN: 25887-UP
4 04020-00616 Pin,Dowel 2 SN: 25887-UP
9 01582-01008 Nut 6 SN: 25887-UP
10 01602-01030 Washer,Spring 6 SN: 25887-UP
11 6127-21-3160 Grommet (K2) 2 SN: 25887-UP
12 6128-21-3811 Gasket (K2) 1 SN: 57469-UP
12 6128-21-3811 Gasket 1 SN: 55329-57468
12 The part specified in the line above can be used instead of this part6128-21-3810 Gasket (K2) 1 SN: 25887-55328
13 01010-31650 Bolt 15 SN: 25887-UP
14 01602-01648 Washer,Spring 15 SN: 25887-UP
18 04020-00820 Pin,Dowel 1 SN: 25887-UP
21 01643-31032 Washer 6 SN: 51356-UP
24 6127-31-6221 Bushing 1 SN: 25887-UP
25 6127-31-6261 Bearing,Thrust 1 SN: 25887-UP
26 6128-21-3231 Gasket (K2) 1 SN: 57469-UP
26 6128-21-3231 Gasket 1 SN: 55329-57468
26 The part specified in the line above can be used instead of this part6128-21-3230 Gasket (K2) 1 SN: 25887-55328
27 01010-31475 Bolt 11 SN: 25887-UP
28 01010-31455 Bolt 4 SN: 25887-UP
29 01010-31480 Bolt 2 SN: 25887-UP
30 01602-01442 Washer,Spring 17 SN: 25887-UP
31 01580-01411 Nut 1 SN: 25887-UP
32 01011-31625 Bolt 2 SN: 36496-UP
33 01602-01648 Washer,Spring 2 SN: 25887-UP
34 01641-21423 Washer 2 SN: 25887-UP
36 01010-80612 Bolt 2 SN: 25887-UP
37 01602-00619 Washer,Spring 2 SN: 25887-UP
38 01642-20608 Washer 2 SN: 25887-UP
40 01010-31440 Bolt 2 SN: 36496-UP
40 01010-31445 Bolt 2 SN: 25887-36495
41 01602-01442 Washer,Spring 2 SN: 25887-UP
42 6127-21-3510 Seal¤ Front (K2) 1 SN: 25887-UP

S6D155-4A — Gear Case And Front Support

Komatsu Engine Timing Gear and Front Cover Parts diagram ENGINES/s6d155r/060030a.png
ENGINES/s6d155r/060030a.png · 40 listed callout rows
Diagram Ref. Part Number Description Qty Serial / Option Notes
2 04020-01434 Pin 1 SN: 10014-UP
3 04020-01434 Pin 1 SN: 14953-UP
4 04020-00616 Pin 2 SN: 10014-UP
9 01582-01008 Nut 6 SN: 10014-UP
10 01602-01030 Washer 6 SN: 10014-UP
11 6127-21-3160 Grommet (K2) 2 SN: 10014-UP
12 6128-21-3810 Gasket (K2) 1 SN: 14953-UP
13 01010-31650 Bolt 15 SN: 11692-UP
13 01010-31650 Bolt 14 SN: 10278-11691
14 01602-01648 Washer 15 SN: 11693-UP
14 01602-01648 Washer 14 SN: 10014-11691
18 04020-00820 Pin 1 SN: 10014-UP
24 6127-31-6221 Bushing 1 SN: 10014-UP
25 6127-31-6261 Bearing 1 SN: 10014-UP
26 6128-21-3230 Gasket (K2) 1 SN: 14953-UP
27 01010-31475 Bolt 9 SN: 24805-UP
27 01010-31475 Bolt 12 SN: 10278-10415
27 01010-31475 Bolt 12 SN: 10014-10277
28 01010-31455 Bolt 4 SN: 10278-UP
29 01010-31480 Bolt 1 SN: 24805-UP
29 01010-31480 Bolt 2 SN: 10416-21775
29 01010-31480 Bolt 1 SN: 10278-10415
30 01602-01442 Washer 17 SN: 10014-UP
31 01641-21423 Washer 2 SN: 10014-UP
32 01011-31625 Bolt 2 SN: 10278-UP
33 01602-01648 Washer 2 SN: 10014-UP
35 6124-21-3240 Gasket (K2) 1 SN: 10014-28423
36 01010-31065 Bolt 8 SN: 10014-10042
37 01602-01030 Washer 8 SN: 10014-28423
39 01010-30612 Bolt 2 SN: 10014-UP
42 01010-31440 Bolt 2 SN: 28366-UP
42 01010-31440 Bolt 4 SN: 10014-28365
43 01602-01442 Washer 2 SN: 28366-UP
43 01602-01442 Washer 4 SN: 10014-28365
44 6127-21-3510 Seal¤ Front (K2) 1 SN: 14953-UP
47 07000-03035 O-Ring (K2) 1 SN: 10866-14063
48 01010-31025 Bolt 1 SN: 10866-14063
49 01602-01030 Washer 1 SN: 10866-14063
29A 01580-01411 Nut 1 SN: 21776-UP
40A 01642-20608 Washer 2 SN: 11764-UP

S6D155-4A — Gear Case And Front Support

Komatsu Engine Timing Gear and Front Cover Parts diagram ENGINES/s6d155c/060030a.png
ENGINES/s6d155c/060030a.png · 40 listed callout rows
Diagram Ref. Part Number Description Qty Serial / Option Notes
2 04020-01434 Pin 1 SN: 10014-UP
3 04020-01434 Pin 1 SN: 14953-UP
4 04020-00616 Pin 2 SN: 10014-UP
9 01582-01008 Nut 6 SN: 10014-UP
10 01602-01030 Washer 6 SN: 10014-UP
11 6127-21-3160 Grommet (K2) 2 SN: 10014-UP
12 6128-21-3810 Gasket (K2) 1 SN: 14953-UP
13 01010-31650 Bolt 15 SN: 11692-UP
13 01010-31650 Bolt 14 SN: 10278-11691
14 01602-01648 Washer 15 SN: 11693-UP
14 01602-01648 Washer 14 SN: 10014-11691
18 04020-00820 Pin 1 SN: 10014-UP
24 6127-31-6221 Bushing 1 SN: 10014-UP
25 6127-31-6261 Metal 1 SN: 10014-UP
26 6128-21-3230 Gasket (K2) 1 SN: 14953-UP
27 01010-31475 Bolt 9 SN: 24805-UP
27 01010-31475 Bolt 12 SN: 10278-10415
27 01010-31475 Bolt 12 SN: 10014-10277
28 01010-31455 Bolt 4 SN: 10278-UP
29 01010-31480 Bolt 1 SN: 24805-UP
29 01010-31480 Bolt 2 SN: 10416-21775
29 01010-31480 Bolt 1 SN: 10278-10415
30 01602-01442 Washer 17 SN: 10014-UP
31 01641-21423 Washer 2 SN: 10014-UP
32 01011-31625 Bolt 2 SN: 10278-UP
33 01602-01648 Washer 2 SN: 10014-UP
35 6124-21-3240 Gasket (K2) 1 SN: 10014-28423
36 01010-31065 Bolt 8 SN: 10014-10042
37 01602-01030 Washer 8 SN: 10014-28423
39 01010-30612 Bolt 2 SN: 10014-UP
42 01010-31440 Bolt 2 SN: 28366-UP
42 01010-31440 Bolt 4 SN: 10014-28365
43 01602-01442 Washer 2 SN: 28366-UP
43 01602-01442 Washer 4 SN: 10014-28365
44 6127-21-3510 Seal, Front (K2) 1 SN: 14953-UP
47 07000-03035 O-Ring (K2) 1 SN: 10866-14063
48 01010-31025 Bolt 1 SN: 10866-14063
49 01602-01030 Washer 1 SN: 10866-14063
29A 01580-01411 Nut 1 SN: 21776-UP
40A 01642-20608 Washer 2 SN: 11764-UP

S6D155-4B — Gear Case And Front Support

Komatsu Engine Timing Gear and Front Cover Parts diagram ENGINES/s6d1550c/060030a.png
ENGINES/s6d1550c/060030a.png · 40 listed callout rows
Diagram Ref. Part Number Description Qty Serial / Option Notes
2 04020-01434 Pin 1 SN: 10016-UP
3 04020-01434 Pin 1 SN: 14953-UP
4 04020-00616 Pin 2 SN: 10016-UP
9 01582-01008 Nut 6 SN: 10016-UP
10 01602-01030 Washer 6 SN: 10016-UP
11 6127-21-3160 Grommet (K2) 2 SN: 10016-UP
12 6128-21-3810 Gasket (K2) 1 SN: 15092-UP
13 01010-31650 Bolt 15 SN: 11692-UP
13 01010-31650 Bolt 14 SN: 10278-11691
14 01602-01648 Washer 15 SN: 11604-UP
14 01602-01648 Washer 14 SN: 10016-11603
18 04020-00820 Pin 1 SN: 10016-UP
24 6127-31-6221 Bushing 1 SN: 10016-UP
25 6127-31-6261 Metal 1 SN: 10016-UP
26 6128-21-3230 Gasket (K2) 1 SN: 14953-UP
27 01010-31475 Bolt 9 SN: 24805-UP
27 01010-31475 Bolt 12 SN: 10278-10415
27 01010-31475 Bolt 12 SN: 10016-10277
28 01010-31455 Bolt 4 SN: 10278-UP
29 01010-31480 Bolt 1 SN: 24805-UP
29 01010-31480 Bolt 2 SN: 10416-21775
29 01010-31480 Bolt 1 SN: 10278-10415
30 01602-01442 Washer 17 SN: 10016-UP
31 01641-21423 Washer 2 SN: 10016-UP
32 01011-31625 Bolt 2 SN: 10278-UP
33 01602-01648 Washer 2 SN: 10016-UP
35 6124-21-3240 Gasket (K2) 1 SN: 10016-28423
36 01010-31065 Bolt 8 SN: 10016-10034
37 01602-01030 Washer 8 SN: 10016-28423
39 01010-30612 Bolt 2 SN: 10016-UP
42 01010-31440 Bolt 2 SN: 28366-UP
42 01010-31440 Bolt 4 SN: 10016-28365
43 01602-01442 Washer 2 SN: 28366-UP
43 01602-01442 Washer 4 SN: 10016-28365
44 6127-21-3510 Seal, Front (K2) 1 SN: 14953-UP
47 07000-03035 O-Ring (K2) 1 SN: 10866-14063
48 01010-31025 Bolt 1 SN: 10866-14063
49 01602-01030 Washer 1 SN: 10866-14063
29A 01580-01411 Nut 1 SN: 21776-UP
40A 01642-20608 Washer 2 SN: 13039-UP

S6D155-4C — Gear Case And Front Support

Komatsu Engine Timing Gear and Front Cover Parts diagram ENGINES/s6d1551r/060200a.png
ENGINES/s6d1551r/060200a.png · 37 listed callout rows
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Diagram Ref. Part Number Description Qty Serial / Option Notes
2 04020-01434 Dowel Pin 1 SN: 10011-UP
3 04020-01434 Dowel Pin 1 SN: 14953-UP
4 04020-00616 Dowel Pin 2 SN: 10011-UP
9 01582-01008 Nut 6 SN: 10011-UP
10 01602-01030 Washer 6 SN: 10011-UP
11 6127-21-3160 Grommet 2 SN: 10011-UP
12 6128-21-3810 Gasket 1 SN: 15193-UP
13 01010-31650 Bolt 15 SN: 11644-UP
13 01010-31650 Bolt 14 SN: 10278-11643
14 01602-01648 Washer 15 SN: 11644-UP
14 01602-01648 Washer 14 SN: 10011-11643
18 04020-00820 Dowel Pin 1 SN: 10011-UP
24 6127-31-6221 Bushing 1 SN: 10011-UP
25 6127-31-6261 Metal 1 SN: 10011-UP
26 6128-21-3230 Gasket 1 SN: 14953-UP
27 01010-31475 Bolt 11 SN: 10416-UP
27 01010-31475 Bolt 12 SN: 10278-10415
28 01010-31455 Bolt 4 SN: 10278-UP
29 01010-31480 Bolt 2 SN: 10416-21775
29 01010-31480 Bolt 1 SN: 10278-10415
30 01602-01442 Washer 17 SN: 10011-UP
31 01641-21423 Washer 2 SN: 10011-UP
32 01011-31625 Bolt 2 SN: 10278-UP
33 01602-01648 Washer 2 SN: 10011-UP
35 6124-21-3240 Gasket 1 SN: 10011-UP
36 01010-31065 Bolt 8 SN: 10011-10081
37 01602-01030 WasherSN: 10011-28423
39 01010-30612 Bolt 2 SN: 10011-UP
42 01010-31445 Bolt 2 SN: 28424-UP
42 01010-31445 Bolt 4 SN: 10278-28423
43 01602-01442 Washer 4 SN: 10014-UP
44 6127-21-3510 Seal 1 SN: 14953-UP
47 07000-03035 O-Ring 1 SN: 10866-14063
48 01010-31025 Bolt 1 SN: 10866-14063
49 01602-01030 Washer 1 SN: 10866-14063
29A 01580-01411 Nut 1 SN: 21776-UP
40A 01642-20608 Washer 2 SN: 13135-UP

S6D155-4-R — Gear Case And Front Support(#30551-)

Komatsu Engine Timing Gear and Front Cover Parts diagram ENGINES/s6d1558c/060030a.png
ENGINES/s6d1558c/060030a.png · 30 listed callout rows
Diagram Ref. Part Number Description Qty Serial / Option Notes
2 04020-01434 Pin,Dowel 1 SN: 30551-UP
3 04020-01434 Pin,Dowel 1 SN: 30551-UP
4 04020-00616 Pin,Dowel 2 SN: 30551-UP
9 01582-01008 Nut 6 SN: 30551-UP
10 01602-01030 Washer,Spring 6 SN: 30551-UP
11 6127-21-3160 Grommet (Kit) 2 SN: 30551-UP
12 6128-21-3811 Gasket (Kit) 1 SN: 55329-UP
12 The part specified in the line above can be used instead of this part6128-21-3810 Gasket 1 SN: 30551-55328
13 01010-31650 Bolt 15 SN: 30551-UP
14 01602-01648 Washer,Spring 15 SN: 30551-UP
18 04020-00820 Pin,Dowel 1 SN: 30551-UP
21 01643-31032 Washer 6 SN: 51356-UP
24 6127-31-6221 Bushing 1 SN: 30551-UP
25 6127-31-6261 Metal,Thrust 1 SN: 30551-UP
26 6128-21-3231 Gasket (Kit) 1 SN: 55329-UP
26 The part specified in the line above can be used instead of this part6128-21-3230 Gasket 1 SN: 30551-55328
27 01010-31475 Bolt 11 SN: 56577-UP
28 01010-31455 Bolt 4 SN: 30551-UP
29 01010-31480 Bolt 2 SN: 56577-UP
30 01602-01442 Washer,Spring 17 SN: 30551-UP
31 01011-31625 Bolt 2 SN: 56577-UP
32 01602-01648 Washer,Spring 2 SN: 30551-UP
33 01641-21423 Washer 2 SN: 30551-UP
35 01010-30612 Bolt 2 SN: 30551-UP
36 01602-00619 Washer,Spring 2 SN: 30551-UP
37 01642-20608 Washer 2 SN: 30551-UP
39 01010-31440 Bolt 2 SN: 30551-UP
40 01602-01442 Washer,Spring 2 SN: 30551-UP
41 6127-21-3510 Seal, Front (Kit) 1 SN: 30551-UP
30A 01580-01411 Nut 1 SN: 30551-UP

S6D155-4K — Gear Case And Front Support

Komatsu Engine Timing Gear and Front Cover Parts diagram ENGINES/s6d1557c/060020a.png
ENGINES/s6d1557c/060020a.png · 30 listed callout rows
Diagram Ref. Part Number Description Qty Serial / Option Notes
2 04020-01434 Pin 2 SN: 22146-UP
3 04020-00616 Pin 2 SN: 22146-UP
8 01582-01008 Nut 6 SN: 22146-UP
9 01602-01030 Washer 6 SN: 22146-UP
10 6127-21-3160 Grommet (K2) 2 SN: 22146-UP
11 6128-21-3810 Gasket (K2) 1 SN: 22146-UP
12 01010-31650 Bolt 15 SN: 22146-UP
13 01602-01648 Washer 15 SN: 22146-UP
17 04020-00820 Pin 1 SN: 22146-UP
23 6127-31-6221 Bushing 1 SN: 22146-UP
24 6127-31-6261 Metal 1 SN: 22146-UP
25 6128-21-3230 Gasket (K2) 1 SN: 22146-UP
26 01010-31475 Bolt 11 SN: 22146-UP
27 01010-31455 Bolt 4 SN: 22146-UP
29 01580-01411 Nut 1 SN: 22146-UP
30 01602-01442 Washer 17 SN: 22146-UP
31 01641-21423 Washer 2 SN: 22146-UP
32 01011-31625 Bolt 2 SN: 22146-UP
33 01602-01648 Washer 2 SN: 22146-UP
35 6124-21-3240 Gasket (K2) 1 SN: 22146-28423
37 01602-01030 Washer 8 SN: 22146-28423
39 01010-30612 Bolt 2 SN: 22146-UP
41 01642-20608 Washer 2 SN: 22146-UP
42 6127-21-3510 Seal, Front (K2) 1 SN: 22146-UP
45 07000-05110 O-Ring (K2) 1 SN: 22146-UP
46 01010-31235 Bolt 3 SN: 22146-UP
47 01602-01236 Washer 3 SN: 22146-UP
49 01580-01210 Nut 3 SN: 22146-UP
50 01602-01236 Washer 3 SN: 22146-UP
51 01643-31232 Washer 3 SN: 22146-UP

Shop the Komatsu Engine Timing Gear and Front Cover Parts collection

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Use this hub to narrow Komatsu engine timing gear and front cover parts by part number, description, and related engine model.

Many Komatsu engine repairs involve small differences by serial range and arrangement. Use this hub as a practical starting point, then confirm the exact part number against your engine book or serial-specific reference.

Featured Komatsu timing gear and front cover parts

This hub includes 133 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.