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MANIFOLDS--Part 1 of 2 Serial No. 23H1 to 23H1440 inclusive 621 WHEEL TRACTOR


AIR INLET AND EXHAUST SYSTEM
MANIFOLD GP-EXHAUST
BASIC ENGINE
CYLINDER HEAD GP
CYLINDER BLOCK GP

WHEEL TRACTOR 621 WHEEL TRACTOR 23H
 621 TRACTOR 23H00001-02222 (MACHINE) UE070042 621 23H   (1966)

AIR INLET AND EXHAUST SYSTEM

MANIFOLD GP-EXHAUST
MANIFOLDS
MANIFOLDS
MANIFOLDS
MANIFOLDS
MANIFOLDS
5S-6392 MANIFOLDS
MANIFOLDS
5S-6392 MANIFOLDS
 

#UE0700420030
 

MANIFOLDS

MANIFOLDS--Part 1 of 2
Serial No. 23H1 to 23H1440 inclusive
c123298 UE070042
None MANIFOLDS Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 7M-2089 [4] SEAL  
2. 1S-9506 [1] SUPPORT  
3. 0S-1587 [2] BOLT  
4. 1S-9437 [1] ELBOW  
5. 4L-8337 [2] SEAL  
6. 2M-5173 [2] SEAL  
7. 2S-7013 [1] SUPPORT  
8. 1S-9041 [1] ELBOW  
9. 3S-6265 [1] ELBOW  
10. 2S-9863 [3] GASKET  
11. 2S-5551 [1] COUPLING  
  5L-8855 [1] RING (3.875" O.D.)  
  2S-5301 [1] RING (4.625" O.D.)  
12. 0S-1588 [3] BOLT  
  3B-4506 [3] LOCKWASHER  
  5B-9628 [3] WASHER  
13. 3S-6266 [1] TUBE ASSEM.  
14. 5B-0213 [6] BOLT  
15. 1B-5355 [14] NUT  
16. 6L-7456 [1] GASKET  
17. 6L-7449 [1] MANIFOLD (Exhaust Left Rear)  
18. 1B-5357 [14] NUT  
19. 6L-7410 [10] WASHER  
20. 3S-5442 [1] MANIFOLD (Exhaust Left Front)  
21. 3S-6270 [2] GASKET  
22. 0S-1591 [6] BOLT  
23. 1H-3502 [8] RING  
24. 3S-5837 [1] ELBOW  
25. 3S-9678 [2] ADAPTER  
26. 0L-1143 [2] BOLT  
27. 3S-6314 [1] SHIELD ASSEM.  
28. 1S-9470 [1] ELBOW  
29. 7S-8407 [6] LOCK  
 

#UE0700420031
 

MANIFOLDS

MANIFOLDS--Part 2 of 2
Serial No. 23H1 to 23H1440 inclusive
c123299 UE070042
None MANIFOLDS Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 3S-5834 [1] TUBE ASSEM.  
2. 5B-0213 [8] BOLT  
  1B-5355 [8] NUT  
3. 3S-5831 [1] ELBOW  
4. 3S-5443 [1] MANIFOLD (Exhaust Right Front)  
5. 2S-9863 [3] GASKET  
6. 5M-6214 [2] PLUG  
7. 6L-7450 [1] MANIFOLD (Exhaust Right Rear)  
8. 6L-7456 [1] GASKET  
9. 0S-1588 [4] BOLT  
10. 3B-4506 [28] LOCKWASHER  
11. 5B-9628 [22] WASHER  
12. 1S-9964 [8] GASKET  
13. 2S-4216 [2] MANIFOLD ASSEM.  
14. 1F-1006 [4] DOWEL  
    (2 in each 2S4216 Manifold Assem.)
15. 0S-1571 [2] BOLT  
16. 1D-4717 [2] NUT  
17. 2S-7263 [1] ADAPTER ASSEM.  
18. 4D-2619 [1] BEARING  
    (Part of 2S7263 Adapter Assem.)
19. 3B-1915 [2] BOLT  
20. 2S-1251 [3] GASKET  
21. 1A-2029 [16] BOLT  
22. 0S-1591 [4] BOLT  
23. 2S-4087 [1] ADAPTER  
24. 3S-9678 [2] ADAPTER  
25. 3S-5830 [1] ELBOW (EXHAUST RH)  
 

#UE0700420032
 

5S-6392: MANIFOLDS

MANIFOLDS (5S6392 N/S)--Part 1 of 2
Serial No. 23H1441-Up
c131466 UE070042
5S6392 MANIFOLDS Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 7M-2089 [4] SEAL  
2. 1S-9506 [1] SUPPORT  
3. 2B-0947 [2] BOLT  
4. 1S-9437 [1] ELBOW  
5. 4L-8337 [2] SEAL  
6. 2M-5173 [2] SEAL  
7. 2S-7013 [1] SUPPORT  
8. 1S-9041 [1] ELBOW  
9. 3S-6265 [1] ELBOW  
10. 2S-9863 [2] GASKET  
11. 2S-5551 [1] COUPLING  
12. 0S-1588 [3] BOLT  
13. 3S-6266 [1] TUBE ASSEM.  
14. 5B-0213 [6] BOLT  
15. 1B-5355 [6] NUT  
16. 6L-7456 [1] GASKET  
17. 6L-7449 [1] MANIFOLD (Exhaust Left Rear)  
18. 1B-5357 [14] NUT  
19. 6L-7410 [10] WASHER  
20. 3S-5442 [1] MANIFOLD (Exhaust Left Front)  
21. 3S-6270 [2] GASKET  
22. 0S-1591 [6] BOLT  
23. 1H-3502 [8] RING  
24. 3S-5837 [1] ELBOW  
25. 3S-9678 [2] ADAPTER  
26. 0L-1143 [2] BOLT  
27. 3S-6314 [1] SHIELD ASSEM.  
28. 1S-9470 [1] ELBOW  
29. 3B-4506 [5] LOCKWASHER  
30. 5B-9628 [3] WASHER  
31. 0S-1594 [2] BOLT  
32. 6H-5852 [1] COVER  
33. 4M-5469 [1] GASKET  
34. 5L-8855 [1] RING  
35. 2S-5301 [1] RING  
36. 7S-8407 [6] LOCK  
 

#UE0700420033
 

5S-6392: MANIFOLDS

MANIFOLDS (5S6392 N/S)--Part 2 of 2
Serial No. 23H1441-Up
c131467 UE070042
5S6392 MANIFOLDS Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 3S-5834 [1] TUBE ASSEM.  
2. 5B-0213 [8] BOLT  
  1B-5355 [8] NUT  
3. 3S-5831 [1] ELBOW  
4. 3S-5443 [1] MANIFOLD (Exhaust Right Front)  
5. 2S-9863 [2] GASKET  
6. 5M-6214 [2] PLUG  
7. 6L-7450 [1] MANIFOLD (Exhaust Right Rear)  
8. 6L-7456 [1] GASKET  
9. 0S-1588 [4] BOLT  
10. 3B-4506 [31] LOCKWASHER  
11. 5B-9628 [20] WASHER  
12. 1S-9964 [8] GASKET  
13. 2S-4216 [2] MANIFOLD ASSEM.  
14. 1F-1006 [4] DOWEL  
    (2 in each 2S4216 Assem.)
15. 0S-1571 [2] BOLT  
  1D-4717 [2] NUT  
16. 2S-1834 [1] GASKET  
17. 2S-7263 [1] ADAPTER ASSEM.  
18. 4D-2619 [1] BEARING  
    (Part of 2S7263 Assem.)
19. 3B-1915 [2] BOLT  
20. 2S-1251 [3] GASKET  
21. 1A-2029 [16] BOLT  
22. 0S-1591 [4] BOLT  
23. 2S-4087 [1] ADAPTER  
24. 3S-9678 [2] ADAPTER  
25. 3S-5830 [1] ELBOW  
26. 0S-1594 [3] BOLT  
27. 2S-1833 [1] COVER  
 

#UE0700420034
 

CYLINDER HEAD AND VALVE MECHANISM

CYLINDER HEAD AND VALVE MECHANISM
Serial No. 23H1 to 23H920 inclusive
See Page 34 for Gasket Kits. Refer also to Page 146 for special parts
c97075 UE070042
None CYLINDER HEAD AND VALVE MECHANISM Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 3S-4762 [2] HEAD ASSEM.  
2. 5M-6214 [2] PLUG  
3. 3B-0623 [36] PLUG  
4. 3B-0645 [6] PLUG  
5. 1S-2895 [16] INSERT (Exhaust)  
  4S-8904 H [16] INSERT (exhaust .005" oversize)  
  4S-8905 H [16] INSERT (exhaust .010" oversize)  
6. 1S-7902 [2] PLUG  
7. 1S-2894 [16] INSERT (Intake)  
  4S-8914 H [16] INSERT (intake .005" oversize)  
  4S-8915 H [16] INSERT (intake .010" oversize)  
8. 1S-2899 [32] GUIDE  
9. 1S-3062 [16] DIRECTOR  
    (1/2 each in 3S4762 Head Assem.)
10. 1S-9540 [6] DOWEL  
11. 6B-6683 [36] NUT  
  2S-0736 [36] WASHER  
12. 6L-4088 [10] STUD  
13. 1S-3028 [32] ROTOCOIL ASSEM.  
14. 2S-7339 [32] SPRING  
15. 3S-6538 [8] SEAL  
16. 3S-4475 [8] CHAMBER ASSEM.  
17. 1S-2903 [16] VALVE (Exhaust)  
  2S-8143 [16] VALVE (Intake)  
18. 2S-7338 [32] RETAINER  
  1S-2898 [64] LOCK  
19. 2S-0735 [32] FERRULE  
20. 6B-6225 [32] SEAL  
21. 5M-2667 [8] GASKET (.194" Thick)  
  1S-9325 [8] GASKET (.199" Thick)  
  1S-9326 [8] GASKET (.204" Thick)  
  1S-9327 [8] GASKET (.209" Thick)  
22. 3S-5496 [2] SEAL  
23. 3S-4776 [2] GASKET  
  H   NOT PART OF 3S4762 HEAD ASSEM.
 

#UE0700420035
 

CYLINDER HEAD AND VALVE MECHANISM

CYLINDER HEAD AND VALVE MECHANISM
Serial No. 23H921 to 942, 944, 948, 951, 953, 960, 977, 979, 983 and 23H1030 inclusive
See Page 34 for Gasket Kits. Refer also to Page 146 for special parts
c142821 UE070042
None CYLINDER HEAD AND VALVE MECHANISM Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 5S-2970 R [2] CYLINDER HEAD ASSEM.  
2. 3B-0623 [18] PLUG  
3. 3B-0645 [3] PLUG  
4. [8] INSERT (Exhaust)  
  4S-8904 H [8] INSERT (.005 in. Oversize)  
  4S-8905 H [8] INSERT (.010 in. Oversize)  
5. 1S-7902 [1] PLUG  
6. 1S-2894 [8] INSERT (Intake)  
  4S-8914 H [8] INSERT (.005 in. Oversize)  
  4S-8915 H [8] INSERT (.010 in. Oversize)  
7. 5S-2921 [16] GUIDE  
8. 1S-3062 [8] DIRECTOR  
9. 2S-9542 [3] DOWEL  
10. 5M-6214 [1] PLUG  
11. 6L-4088 [10] STUD  
12. 1S-3028 [32] ROTOCOIL ASSEM.  
13. 2S-7339 [32] SPRING  
14. 3S-6538 [8] SEAL  
15. 5S-2923 [8] CHAMBER ASSEM.  
16. 1S-2903 [16] VALVE (Exhaust)  
  2S-8143 [16] VALVE (Intake)  
17. 2S-7338 [32] RETAINER  
  1S-2898 [64] LOCK  
18. 2S-0735 [32] FERRULE  
19. 6B-6225 [32] SEAL  
20. 5M-2667 [8] GASKET  
21. 3S-5496 [2] SEAL  
22. 5S-2943 [2] GASKET  
23. 6B-6683 [36] NUT  
  2S-0736 [36] WASHER  
  H   NOT PART OF 5S2970 HEAD ASSEM.
  R   REMFG PART MAY BE AVAILABLE
 

#UE0700420036
 

CYLINDER HEAD AND VALVE MECHANISM

CYLINDER HEAD AND VALVE MECHANISM
Serial No. 23H943, 945 to 947, 949, 950, 952, 954 to 959, 961 to 976, 978, 980 to 982, 984 to 1029 & 23H1031 to 23H1440 inclusive
See Page 34 for Gasket Kits. Refer also to Page 146 for special parts
c123812 UE070042
None CYLINDER HEAD AND VALVE MECHANISM Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 2S-7339 [32] SPRING  
2. 6B-6683 [36] NUT  
  2S-0736 [36] WASHER  
3. 5S-2923 [8] CHAMBER ASSEM.  
4. 3S-6538 [8] SEAL  
5. 1S-2898 [64] LOCK  
6. 2S-7338 [32] RETAINER  
7. 1S-3028 [32] ROTOCOIL ASSEM.  
8. 6L-4088 [10] STUD  
9. 5S-2970 R [2] HEAD ASSEM.  
10. 2S-9542 [6] DOWEL  
11. 5M-6214 [2] PLUG  
    (One half each in 5S2970 Head Assem.)
12. 1S-2895 [16] INSERT (Standard Exhaust)  
  4S-8904 H [16] INSERT (.005" oversize)  
  4S-8905 H [16] INSERT (.010" oversize)  
13. 1S-2894 [16] INSERT (Standard Intake)  
  4S-8914 H [16] INSERT (.005" oversize)  
  4S-8915 H [16] INSERT (.010" oversize)  
14. 1S-3062 [16] DIRECTOR  
15. 1S-7902 [2] PLUG  
16. 5S-2921 [32] GUIDE  
17. 3B-0645 [6] PLUG  
18. 3B-0623 [36] PLUG  
    (One half each in 5S2970 Head Assem.)
19. 5M-2667 [8] GASKET (.194" Thick)  
20. 6B-6225 [32] SEAL  
21. 2S-0735 [32] FERRULE  
22. 1S-2903 [16] VALVE (Exhaust)  
23. 7S-2514 [16] VALVE (Intake)  
24. 3S-5496 [2] SEAL  
25. 5S-2943 [2] GASKET  
  H   NOT PART OF 5S2970 HEAD ASSEM.
  R   REMFG PART MAY BE AVAILABLE
 

#UE0700420037
 

7S-2520: CYLINDER HEAD AND VALVE MECHANISM

CYLINDER HEAD AND VALVE MECHANISM (7S2520 N/S)
Serial No. 23H1441-Up
See Page 34 for Gasket Kits
c111365 UE070042
7S2520 CYLINDER HEAD AND VALVE MECHANISM Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 2S-7339 [32] SPRING  
2. 1D-4593 [36] BOLT  
  2S-0736 [36] WASHER  
3. 5S-2920 [8] CHAMBER ASSEM.  
4. 3S-6538 [8] SEAL  
5. 1S-2898 [64] LOCK  
6. 2S-7338 [32] RETAINER  
7. 1S-3028 [32] ROTOCOIL ASSEM.  
8. 6L-4088 [10] STUD  
9. 5S-2970 R [2] HEAD ASSEM.  
10. 2S-9542 [6] DOWEL  
11. 5M-6214 [2] PLUG  
    (One half each in 5S2970 Head Assem.)
12. 1S-2895 [16] INSERT (Standard-Exhaust)  
  4S-8904 H [16] INSERT (.005" oversize)  
  4S-8905 H [16] INSERT (.010" oversize)  
13. 1S-2894 [16] INSERT (Standard-Intake)  
  4S-8914 H [16] INSERT (.005" oversize)  
  4S-8915 H [16] INSERT (.010" oversize)  
14. 1S-3062 [16] DIRECTOR  
15. 1S-7902 [2] PLUG  
16. 5S-2921 [32] GUIDE  
17. 3B-0645 [6] PLUG  
18. 3B-0623 [36] PLUG  
    (One half each in 5S2970 Head Assem.)
19. 5M-2667 [8] GASKET (.194" Thick)  
  1S-9325 [8] GASKET (.197" Thick)  
  1S-9326 [8] GASKET (.202" Thick)  
  1S-9327 [8] GASKET (.207" Thick)  
20. 9S-8490 [32] SEAL ASSEM.  
21. 1S-2903 [16] VALVE (Exhaust)  
22. 7S-2514 [16] VALVE (Intake)  
23. 3S-5496 [2] SEAL  
24. 5S-2943 [2] GASKET  
  H   NOT PART OF 5S2970 HEAD ASSEM.
  R   REMFG PART MAY BE AVAILABLE
 

#UE0700420038
 

CYLINDER BLOCK AND COVERS

CYLINDER BLOCK AND COVERS--Side View--Part 1 of 3
Serial No. 23H1 to 201, 203, 204, 206, 209 to 213, 216 to 219, 222, 223, 225, 226, 236, 237, 281, 284, 316, 351, 409 & 23H605 inclusive
Cylinder Block parts are shown on Page 32. See Page 34 for Gasket Kits
c105328 UE070042
None CYLINDER BLOCK AND COVERS Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 2S-9797 [1] GASKET  
2. 2S-0512 [1] GASKET  
3. 8M-4990 [4] SEAL  
4. 1S-7340 [1] ADAPTER  
5. Y [1] BLOCK ASSEM.  
    (See Separate Illustration)
6. 2S-5176 [8] LINER  
  3S-3977 [24] SEAL  
7. 3S-0588 [1] GASKET  
8. 2S-0339 [1] GASKET  
9. 2S-0870 [1] BUSHING ASSEM.  
10. 1S-9013 [1] GASKET  
11. 2S-0412 [1] GASKET  
12. 1S-5165 [1] PAN ASSEM.  
13. 3D-4603 [1] PLUG  
    (Part of 1S5165 Pan Assem.)
14. 0S-1571 [4] BOLT (1.75" Long)  
  0S-1590 [20] BOLT (2" Long)  
15. 3B-4506 [44] LOCKWASHER  
16. 4B-4278 [39] WASHER  
17. 1S-8439 [1] PLATE ASSEM.  
18. 8M-5362 [8] BOSS  
    (Part of 1S8439 Plate Assem.)
19. 0T-0573 [12] BOLT  
20. 0L-1143 [4] BOLT  
21. 2S-4248 [1] PAN  
22. 1S-8586 [1] BRACKET  
23. 2S-0411 [2] GASKET  
24. 1S-9014 [1] BAFFLE ASSEM.  
25. 0S-1594 [4] BOLT  
  Y   SEPARATE ILLUSTRATION
 

#UE0700420039
 

CYLINDER BLOCK AND COVERS

CYLINDER BLOCK AND COVERS--Front View--Part 2 of 3
Serial No. 23H1 to 201, 203, 204, 206, 209 to 213, 216 to 219, 222, 223,
225, 226, 236, 237, 281, 284, 316, 351 409 & 23H605 inclusive
c78780 UE070042
None CYLINDER BLOCK AND COVERS Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 2S-3208 [1] PLATE ASSEM.  
2. 6B-6489 [1] STUD (3.25" Long)  
3. 0L-1064 [1] STUD (5.25" Long)  
4. 0T-0398 [3] STUD (1.312" Long)  
5. 1S-8570 [1] FERRULE  
    (Parts of 2S3208 Plate Assem.)
6. 1S-7594 [1] HOUSING ASSEM.  
7. 2S-2999 [1] BEARING  
8. 5M-6214 [2] PLUG  
9. 2S-8130 [1] BEARING  
10. 2D-8426 [2] STUD (3.20" Long)  
11. 2D-8154 [3] STUD (2.40" Long)  
12. 3B-0551 [2] PLUG  
    (Parts of 1S7594 Housing Assem.)
13. 1B-4203 [3] NUT  
14. 3B-4506 [17] LOCKWASHER  
15. 8M-8281 [1] SEAL  
16. 1S-8624 [1] LOCK  
17. 0T-0573 [1] BOLT  
18. 0S-1594 [3] BOLT  
19. 6H-1717 [1] BOLT  
20. 1B-2886 [2] BOLT  
21. 3B-4508 [8] LOCKWASHER  
22. 1A-3544 [1] LOCK  
23. 0L-1351 [4] BOLT  
24. 0L-0364 [1] LOCK  
25. 1D-4566 [6] BOLT  
26. 0L-1352 [6] BOLT  
27. 3S-8599 [4] BOLT  
 

Information:

Disassembly and Assembly
Exhaust Manifolds
621 & 623 TRACTOR-SCRAPER ENGINE
Service Magazine
A New Exhaust Gasket Is Now Available {1059}
2008/11/24

Caterpillar Parts SIS Catalog 621 :

TURBOCHARGER ASSEMBLY
3S-8297 TURBOCHARGER ASSEMBLY
TURBOCHARGER ASSEMBLY
3S-8297 TURBOCHARGER ASSEMBLY
AIR CLEANER
5D-5970 AIR CLEANER
AIR FILTER INDICATOR GROUP
7M-0914 AIR FILTER INDICATOR GROUP
ENGINE SUPPORT
ENGINE SUPPORT
BREATHER AND OIL FILLER
BREATHER AND OIL FILLER
ENGINE SUPPORT
ENGINE SUPPORT
BREATHER AND OIL FILLER
BREATHER AND OIL FILLER
MANIFOLDS
MANIFOLDS
MANIFOLDS
5S-6392 MANIFOLDS
MANIFOLDS
5S-6392 MANIFOLDS
CYLINDER HEAD AND VALVE MECHANISM
CYLINDER HEAD AND VALVE MECHANISM
CYLINDER HEAD AND VALVE MECHANISM
CYLINDER HEAD AND VALVE MECHANISM
CYLINDER HEAD AND VALVE MECHANISM
CYLINDER HEAD AND VALVE MECHANISM
CYLINDER HEAD AND VALVE MECHANISM
7S-2520 CYLINDER HEAD AND VALVE MECHANISM
CYLINDER BLOCK AND COVERS
CYLINDER BLOCK AND COVERS

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