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3S9620 FUEL PUMP HOUSING GROUP--Part 1 of 2--Type 2 Part of Fuel Pump Housing and Governor shown on Pages 41, 147 and 147B 621


FUEL SYSTEM
PUMP GP-FUEL TRANSFER
LINES GP-FUEL INJECTION
LUBRICATION SYSTEM
LINES GP-ENGINE OIL
FILTER GP-ENGINE OIL
PUMP GP-ENGINE OIL
ELECTRICAL AND STARTING SYSTEM
STARTING MOTOR GP


FUEL SYSTEM

PUMP GP-FUEL TRANSFER
 

#UEG0051S0080
 

3S-9620: FUEL PUMP HOUSING GROUP

3S9620 FUEL PUMP HOUSING GROUP--Part 1 of 2--Type 2
Part of Fuel Pump Housing and Governor shown on Pages 41, 147 and 147B
c115206 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 5S-4524 [1] HOUSING ASSEM.  
2. 9H-4926 [1] FERRULE  
3. 5F-1749 [2] DOWEL  
4. 9H-1296 [1] BEARING  
5. 5M-6214 [1] PLUG  
6. 1P-0234 C [8] DOWEL  
  1P-0232 [8] BALL  
7. 1P-0233 C [8] DOWEL  
  1P-0231 [8] BALL  
8. 0T-0200 [1] PLUG  
9. 1S-7101 [2] BEARING  
10. 1S-7103 [1] BEARING  
11. 5S-4526 [1] BEARING  
12. [2] PLUG  
13. 4M-1474 C [4] PIN  
14. 1S-7595 [1] SLEEVE  
15. 1S-7315 [1] BEARING  
16. 6F-0984 [1] DOWEL  
17. 7M-5839 [1] PLUG  
18. 9S-4197 [1] BUSHING  
    (Parts of 5S4524 Housing Assem.)
19. 1B-7182 [1] BOLT  
  3B-4505 [1] LOCKWASHER  
20. 1S-7316 [1] PLATE  
21. 4B-4277 [1] WASHER  
22. 1S-9546 [1] GASKET  
23. 8F-0394 [1] SPRING  
24. 1S-9480 [1] PIN  
25. 2S-8084 [1] RACK  
26. 0S-1617 [2] BOLT  
  2S-4068 [1] LOCK  
27. 4S-7794 [1] CAMSHAFT ASSEM.  
28. 4S-5662 [1] PIN  
29. 1S-9481 [1] COVER  
  C   INDICATES CHANGE
 

#UEG0051S0081
 

3S-9620: FUEL PUMP HOUSING GROUP

3S9620 FUEL PUMP HOUSING GROUP--Part 2 of 2--Type 2
Part of Fuel Pump Housing and Governor shown on Pages 41, 147 and 147B
c127731 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 2S-7018 [1] GASKET  
2. 1B-7182 [2] BOLT  
  4B-4277 [2] WASHER  
3. 3S-5759 [1] LEVER  
4. 2S-7020 [1] COVER ASSEM.  
5. 4F-3492 [1] DOWEL  
    (Part of 2S7020 Assem.)
6. 2A-5222 C [1] WASHER  
7. 2A-5220 [1] PLUG  
8. 2M-4314 [8] BUSHING  
9. 1B-7182 C [2] BOLT  
  3B-4505 [2] LOCKWASHER  
10. 8H-9204 [8] WASHER  
11. 8S-0218 C [1] PIN ASSEM.  
12. 4M-0411 [8] BONNET  
13. 9B-1363 [8] SPRING  
14. 8S-0219 C [1] FLANGE  
15. 1S-7057 C [2] GASKET  
16. 1M-1077 [8] SEAL  
17. 1M-3506 [8] RING  
18. 9H-5746 [8] CHECK  
19. 5M-2697 [8] SPACER (.170" Thick)  
  2M-4208 [8] SPACER (.174" Thick)  
  2M-4209 [8] SPACER (.178" Thick)  
  2M-4210 [8] SPACER (.182" Thick)  
  2M-4211 [8] SPACER (.186" Thick)  
  2M-4212 [8] SPACER (.190" Thick)  
  5M-2691 [8] SPACER (.194" Thick)  
20. 3S-8336 [8] PLUNGER AND BARREL ASSEM.  
21. 1S-7592 [8] SPRING  
22. 9H-5729 [8] WASHER  
23. 3S-9736 [8] LIFTER ASSEM.  
  C   INDICATES CHANGE FROM PREVIOUS
 

#UEG0051S0082
 

FUEL INJECTION VALVES AND LINES

FUEL INJECTION VALVES AND LINES
c127277 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 1S-9272 [1] TUBE  
2. 0T-0102 [1] BOLT  
3. 3B-4506 [1] LOCKWASHER  
4. 9S-1350 [1] CLIP  
5. 2B-2404 [1] CLIP  
6. 1S-9274 [1] TUBE  
7. 3B-8995 [2] FITTING  
8. 1F-1344 [2] NUT  
    (1 in each 3B8995 Fitting)
9. 3B-8996 [1] FITTING  
10. 8F-8997 [1] NUT  
    (Part of 3B8996 Fitting)
11. 1S-5185 [1] LINE ASSEM. (No. 8)  
12. 1S-5183 [1] LINE ASSEM. (No. 6)  
13. 5H-6005 [8] SEAL  
14. 3S-1004 [8] LINE ASSEM.  
15. 1S-9323 [8] ADAPTER ASSEM.  
16. 1S-5181 [1] LINE ASSEM. (No. 4)  
17. 1S-5179 [1] LINE ASSEM. (No. 2)  
18. 7S-5040 [2] CLAMP ASSEM.  
19. 4B-3388 [8] BOLT  
20. 7S-1781 [1] CLAMP ASSEM.  
21. 3B-4505 [10] LOCKWASHER  
22. 1S-7106 [1] COVER  
23. 1S-7107 [1] GASKET  
24. 2B-2695 [2] BOLT  
25. 1S-5178 [1] LINE ASSEM. (No. 1)  
26. 2S-9828 [8] NOZZLE ASSEM.  
27. 2S-9872 [8] NUT  
28. 3S-3498 [8] BODY  
29. 5S-5993 [1] LINE ASSEM. (No. 3)  
30. 5S-5995 [1] LINE ASSEM. (No. 5)  
31. 2A-5328 [8] LOCK  
32. 1D-4716 [8] NUT  
33. 1S-5184 [1] LINE ASSEM. (No. 7)  
34. 4S-8385 H TUBE 12.75"  
35. 3B-8998 [1] FITTING  
  1F-1344 [1] NUT  
    (Part of 3B8998 Fitting)
36. 1S-1225 [1] SEAL  
  H   ORDER BY THE FOOT
 

#UEG0051S0083
 

OIL LINES

OIL LINES
c105167 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 0T-0055 [2] BOLT  
2. 3B-4506 [15] LOCKWASHER  
3. 1S-6595 [1] GASKET  
4. 0S-1594 [4] BOLT  
5. 1S-4810 [1] GASKET  
6. 6K-4949 [1] CLIP ASSEM.  
7. 1D-4539 [1] BOLT  
8. 4B-4277 [1] WASHER  
9. 8M-5900 [1] FITTING  
  8F-9362 [2] NUT  
    (Part of 8M5900 Fitting)
10. 8M-5266 [1] SEAL  
11. 1A-2029 [2] BOLT  
12. 2S-4204 [1] ELBOW  
13. 2S-5632 [1] GAUGE ASSEM.  
14. 2S-5629 [1] TUBE ASSEM.  
    (Oil Level Gauge Guide)
15. 5D-6523 [1] CLIP  
16. 7F-7889 [1] GASKET  
17. 3B-9053 [1] FITTING  
  8F-8998 [1] NUT  
    (Part of 3B9053 Fitting)
18. 4S-7868 [1] TUBE (Oil Cooler Drain)  
19. 3B-8997 [1] FITTING  
  8F-8998 [1] NUT  
    (Part of 3B8997 Fitting)
20. 4S-8792 [1] ADAPTER  
21. 1S-9527 [1] GASKET  
22. 8M-1869 [1] PLUG  
23. 0S-1587 [1] BOLT (1.75" Long)  
24. 9S-1366 [1] BOLT (2.50" Long)  
25. 3B-4508 [2] LOCKWASHER  
26. 7M-7410 [1] PLUG  
27. 1F-6068 [1] FITTING  
  8F-9362 [1] NUT  
    (Part of 1F6068 Fitting)
28. 2S-0538 [1] TUBE (33.50" Long)  
    (Ref. No. 38 to Oil Filter Base)
29. 8H-9402 [1] ADAPTER  
  9H-4557 [2] SEAL  
30. 2H-2519 [1] GASKET  
31. 1S-7654 [1] COVER  
  1S-7331 [1] GASKET  
32. 0S-1590 [6] BOLT  
33. 2S-4181 [1] TUBE ASSEM. (Oil Drain)  
34. 2S-0542 [1] TUBE ASSEM. (Oil Supply)  
35. 6B-5703 [1] SPACER  
36. 3B-4505 [1] LOCKWASHER  
37. 7S-1717 [1] BRACKET  
38. 0L-1351 [1] BOLT  
39. 1D-4717 [1] NUT  
40. 3J-5389 [1] PLUG  
 

#UEG0051S0084
 

1S-5132: OIL FILTER ASSEMBLY

1S5132 OIL FILTER ASSEMBLY
c105164 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 8H-1454 [3] CASE ASSEM.  
2. 8H-1462 [3] COVER ASSEM.  
3. 5M-5999 [3] GASKET  
4. 1K-2728 [3] GASKET  
5. 3H-3385 [3] SEAL  
6. 6B-0806 [3] SPRING  
7. 8H-1461 [3] PLATE  
8. 7F-7691 [3] CLIP  
9. 8H-1460 [3] SCREW  
    (1 each in 8H1462 Cover Assem.)
10. 9M-3873 [3] STUD ASSEM.  
11. 4H-3119 [3] PIN (Spring)  
    (1 in each 9M3873 Stud Assem.)
12. 5S-0484 [3] ELEMENT ASSEM.  
    (Disposable)
13. 2M-8691 [3] GASKET  
14. 0S-1588 H [7] BOLT  
15. 3B-4506 H [8] LOCKWASHER  
16. 1S-9544 H [2] SEAL  
17. 0S-1590 H [1] BOLT  
18. 2S-0543 [1] BASE ASSEM.  
  1S-8881 [2] FERRULE  
19. 0L-2288 [1] PLUG  
20. 3L-1850 [3] PLUG  
21. 9M-0853 [2] PLUNGER  
22. 6F-8007 [2] SPRING  
23. 6B-0831 [1] GASKET  
24. 2M-1538 [4] STUD  
25. 8M-9928 [1] PLUNGER  
26. 8M-9929 [1] RETAINER  
27. 9M-4685 [1] SPRING  
28. 6B-0830 [1] COVER  
29. 0S-1617 [2] BOLT  
30. 3B-4505 [2] LOCKWASHER  
31. 2H-8829 [1] PLUG  
32. 4F-9325 [1] GASKET  
    (Parts of 2S543 Base Assem.)
33. 6L-1651 H [2] SEAL  
34. 8H-1495 [2] CLAMP  
35. 0S-1588 [4] BOLT  
36. 3B-4506 [4] LOCKWASHER  
37. 1M-7360 [2] CLAMP  
  H   NOT PART OF 1S5132 OIL FILTER
 

#UEG0051S0085
 

1S-8653: OIL PUMP AND DRIVE

OIL PUMP AND DRIVE (1S8653 N/S)
c129231 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 0S-1571 [2] BOLT (1.75" long)  
2. 7H-1861 [6] LOCK  
3. 8M-5249 [1] SEAL  
4. 1S-9523 Y [1] PUMP ASSEM.  
    (See Separate Illustration)
5. 1S-5948 [1] GEAR ASSEM. (44 Teeth)  
  1S-5944 [1] BEARING  
    (Part of 1S5948 Gear Assem.)
6. 0S-1590 [1] BOLT (2" long)  
7. 2H-3755 [4] BOLT  
8. 1M-7390 [4] LOCK  
9. 1S-2835 [1] GEAR (44 Teeth)  
10. 3B-5412 [1] NUT  
11. 9S-1302 [1] WASHER  
12. 3B-4619 [1] COTTER PIN  
13. 2S-4001 [1] BAFFLE  
14. 8M-5599 [1] KEY  
15. 7M-4353 [2] GASKET  
16. 7B-2742 [6] BOLT  
17. 8F-8682 [2] LOCK  
18. 2S-2726 [1] SCREEN ASSEM.  
19. 1S-7404 [1] BELL  
20. 1S-7389 [1] COVER  
21. 0S-1588 [2] BOLT  
22. 7M-0168 [1] LOCK  
23. 2S-0356 [1] GASKET  
24. 0L-1143 [1] BOLT (2.50" long)  
  Y   SEPARATE ILLUSTRATION
 

#UEG0051S0086
 

1S-9523: OIL PUMP ASSEMBLY

1S9523 OIL PUMP ASSEMBLY
Part of Oil Pump and Drive
c128131 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 1S-9565 [1] BODY ASSEM.  
2. 1S-9529 [1] BEARING  
3. [1] SHAFT  
    (Parts of 1S9565 Body Assem.)
4. 1S-9827 [1] GEAR ASSEM. (12 Teeth Idler)  
5. 1S-9572 [2] BEARING  
    (Part of 1S9827 Gear Assem.)
6. 2S-5175 [1] SPACER  
7. 1S-9826 [1] GEAR ASSEM. (12 Teeth Idler)  
8. 1S-9572 [2] BEARING  
    (Part of 1S9826 Gear Assem.)
9. 8S-1338 C [1] SHAFT ASSEM. (12 Teeth Drive)  
10. 7S-9444 C [1] GEAR (12 Teeth Drive)  
11. 5S-1613 C [1] KEY  
12. 1B-2886 [2] BOLT (3.75" Long)  
  0S-1573 [2] BOLT (4" Long)  
13. 4H-2010 [4] LOCK  
14. 0S-1588 [1] BOLT  
15. 0L-0364 [3] LOCK  
16. 3S-5823 [1] SPRING  
  2S-2781 [1] PLUNGER  
17. 9M-7579 [1] COVER  
18. 0T-0573 [2] BOLT  
19. 4S-5355 [1] DIFFUSER  
20. 1S-5953 [1] BODY ASSEM.  
21. 8M-1063 [2] DOWEL  
22. 1S-9402 [2] DOWEL  
23. 1S-9529 [1] BEARING  
24. 1S-5946 [1] SHAFT ASSEM.  
25. 5B-5821 [1] DOWEL  
    (Parts of 1S5953 Body Assem.)
  C   INDICATES CHANGE FROM PREVIOUS
 

#UEG0051S0087
 

3S-8473: ELECTRIC STARTING MOTOR ASSEMBLY

3S8473 ELECTRIC STARTING MOTOR ASSEMBLY--24 Volt--Part 1 of 3
Part of 1S8658 Electric Starter Group shown on Page 58
c113562 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. [1] LEAD ASSEM.  
2. [1] SEAL  
3. [3] WASHER  
4. [3] LOCKWASHER  
5. [3] SCREW  
6. [1] PLATE ASSEM.  
7. [12] WASHER  
8. [1] PLATE  
9. [3] SCREW  
10. [12] LOCKWASHER  
11. [3] PLATE  
12. [6] HOLDER  
13. [3] SCREW  
14. [12] SPRING  
15. [1] PLATE ASSEM.  
16. [3] PLATE  
17. [3] SCREW  
18. [1] PLATE  
19. [3] SCREW  
20. [13] SCREW (.312" Long)  
  [12] LOCKWASHER  
21. [12] BRUSH ASSEM.  
22. [2] WASHER  
23. [1] SEAL  
24. [1] BUSHING  
25. [1] INSULATOR  
26. [1] WASHER  
27. [2] LOCKWASHER  
28. [1] NUT  
29. [1] NUT  
 

#UEG0051S0088
 

3S-8473: ELECTRIC STARTING MOTOR ASSEMBLY

3S8473 ELECTRIC STARTING MOTOR ASSEMBLY--24 Volt--Part 2 of 3
Part of 1S8658 Electric Starter Group shown on Page 58
4M1812 Solenoid Switch Assembly parts are shown on Page 58
c113561 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 7F-4556 [6] BOLT  
2. 1L-4789 [6] LOCKWASHER  
3. 7M-0328 [1] FRAME ASSEM.  
4. 7S-9826 [1] PLUG  
5. 7F-3506 [1] BUSHING  
6. 9F-2247 [1] PLUG  
7. 9F-2547 [1] WICK  
8. 7S-9825 [1] GASKET  
9. 7M-8651 [1] ARMATURE ASSEM.  
10. 3L-3380 [1] BUSHING  
11. 7M-0324 [1] COIL ASSEM.  
12. 9H-3757 [2] WASHER  
13. 7F-3494 [1] WASHER  
14. 7M-0326 [1] CONNECTOR  
15. 1D-5117 [2] NUT  
16. 4M-1812 Y [1] SWITCH ASSEM.  
    (See Separate Illustration)
17. 6H-3622 [4] SCREW ASSEM.  
18. 3B-4508 [1] LOCKWASHER  
19. 9F-9298 [12] SCREW  
20. 7M-0325 [1] INSULATOR  
21. 4M-1831 [3] PLUG  
22. 4M-1832 [3] GASKET  
23. 1H-2629 [3] STRIP  
24. 7F-3488 [6] SHOE  
25. 7M-0327 [1] WASHER  
  Y   SEPARATE ILLUSTRATION
 

#UEG0051S0089
 

3S-8473: ELECTRIC STARTING MOTOR ASSEMBLY

3S8473 ELECTRIC STARTING MOTOR ASSEMBLY--24 Volt--Part 3 of 3
Part of 1S8658 Electric Starter Group shown on Page 58
c145882 UEG0051S
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Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 4M-1855 [1] PLUNGER ASSEM.  
2. 2S-4027 [1] WASHER  
3. 4M-1829 [1] BOOT  
4. 4M-1828 [1] RETAINER  
5. 9M-7609 [1] SPRING  
6. 4M-1827 [1] RETAINER  
7. 1H-1023 [1] SEAL  
8. 7M-0333 [1] HOUSING ASSEM.  
9. 9F-2547 [1] WICK  
10. 9F-2247 [1] PLUG  
11. 1M-9968 [1] BUSHING  
12. 2F-6678 [1] SEAL  
13. 7S-9826 [1] PLUG  
14. 7S-9825 [1] GASKET  
15. 2H-3429 [2] RING  
16. 4L-2729 [1] WASHER  
17. 4M-1853 [1] LEVER ASSEM.  
18. 3F-2617 [1] NUT  
19. 4M-1832 [1] GASKET  
20. 4M-1831 [1] PLUG  
21. 1S-0297 [1] HOUSING ASSEM.  
22. 4M-1896 C [1] BUSHING  
23. 4M-1833 [5] SCREW (1.50" Long)  
  7M-0336 [1] SCREW (.875" Long)  
24. 9M-3158 [1] CLUTCH ASSEM.  
25. 2S-0366 [1] PINION  
26. 1M-9953 [1] SPRING  
27. 4M-1851 [1] GASKET  
28. 4M-1854 [1] SHAFT  
29. 2D-6392 [1] SEAL  
30. 7F-4556 [7] BOLT  
31. 1L-4789 [7] LOCKWASHER  
32. 2J-8163 [1] SEAL  
33. 1M-9971 [1] SPACER  
    THE FOLLOWING REPAIR KIT IS AVAILABLE:
34. 1S-8931 [1] KIT (Cup)  
    (Includes 2 Straight & 2 Flanged Cups)
  C   INDICATES CHANGE
 

Information:

Special Instruction
Installation Of 8N628 Bearing{7551, 1253}
Installation Of 8N628 Bearing{7551, 1253}
Specifications
Tool Operating Manual
20 GPM Portable Fuel Filtration System {0374, 0599, 0706, 1250, 1256, 1261}
20 GPM Portable Fuel Filtration System {0374, 0599, 0706, 1250, 1256, 1261}
Disassembly and Assembly
Fuel Priming Pump
621 & 623 TRACTOR-SCRAPER ENGINE
Fuel Transfer Pump
621 & 623 TRACTOR-SCRAPER ENGINE
Governor
621 & 623 TRACTOR-SCRAPER ENGINE
Variable Timing Unit
621 & 623 TRACTOR-SCRAPER ENGINE
Fuel Injection Pump Housing And Governor
621 & 623 TRACTOR-SCRAPER ENGINE
Fuel Injection Pump Housing
621 & 623 TRACTOR-SCRAPER ENGINE
Service Magazine

Caterpillar Parts SIS Catalog 621 :

Truck sale:

699,500 
Caterpillar 621K WT, water trucks, Transport
- water trucks
HOLT OF CALIFORNIA
379,500 
Caterpillar 621K, Road Scraper, Construction
- Road Scraper
ALTORFER INC.
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