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8D6900 STEERING SERVO-RECEIVER MOUNTING & CYLINDER GROUP Serial No. 45P1 to 45P1059 inclusive 9J8774 Cylinder parts are shown on Page 94 621B


STEERING SYSTEM
CYLINDER GP
LINES GP

WHEEL TRACTOR 621B WHEEL TRACTOR 45P
 621B TRACTOR 45P00001-02711 (MACHINE) UEG0807S 621B 45P   (1973)

STEERING SYSTEM

CYLINDER GP
CYLINDER & MOUNTING GP
8D-6900 CYLINDER & MOUNTING GP
CYLINDER & MOUNTING GP
8D-6900 CYLINDER & MOUNTING GP
2G-1100 STEERING FOLLOW-UP SUPPLY GROUP
CYLINDER GP STEERING SERVO
9J-8774 CYLINDER GP STEERING SERVO
STEERING CYLINDER GROUP
8J-7376 STEERING CYLINDER GROUP
CYLINDER GP-STEERING
3G-5192 CYLINDER GP-STEERING
STEERING SERVO-MASTER CYLINDER GROUP
5J-8606 STEERING SERVO-MASTER CYLINDER GROUP
CYLINDER GP-STEER
3G-6904 CYLINDER GP-STEER
 

#UEG0807S0340
 

8D-6900: CYLINDER & MOUNTING GP

8D6900 STEERING SERVO-RECEIVER MOUNTING & CYLINDER GROUP
Serial No. 45P1 to 45P1059 inclusive
9J8774 Cylinder parts are shown on Page 94
c154809 UEG0807S
8D6900 CYLINDER & MOUNTING GP Parts scheme
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 0S-1585 [4] BOLT  
  3B-4508 [4] LOCKWASHER  
2. 8D-6059 [1] SUPPORT  
3. 6D-0083 [2] BOLT  
  1B-4439 [2] NUT  
4. 3B-4621 [2] PIN  
  6D-0082 [4] SPACER  
5. 9J-8774 Y [1] CYLINDER GROUP  
    (Separate Illustration)
  Y   SEPARATE ILLUSTRATION
 

#UEG0807S0341
 

8D-6900: CYLINDER & MOUNTING GP

8D6900 STEERING SERVO-RECEIVER MOUNTING AND CYLINDER GROUP
Serial No. 45P1060-Up
9J8774 Cylinder parts are shown on Page 94
c156662 UEG0807S
8D6900 CYLINDER & MOUNTING GP Parts scheme
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 0S-1585 [4] BOLT  
  3B-4508 [4] LOCKWASHER  
2. 8D-6059 [1] SUPPORT  
3. 2G-2413 C [2] PIN  
  4B-4283 C [2] WASHER  
4. 3B-4629 C [2] COTTER  
  6D-0082 [4] SPACER  
5. 9J-8774 Y [1] CYLINDER GROUP  
    (Separate Illustration)
  C   INDICATES CHANGE
  Y   SEPARATE ILLUSTRATION
 

#UEG0807S0342
 

2G-1100: STEERING FOLLOW-UP SUPPLY GROUP

2G1100 STEERING FOLLOW-UP SUPPLY GROUP--Field Installation
Serial No. 45P1 to 45P869 inclusive
UEG0807S0342 UEG0807S
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
  9J-5503 Y [1] VALVE ASSEMBLY  
  2B-2694 [2] BOLT  
  3B-4505 [2] LOCKWASHER  
  0S-1571 [2] BOLT  
  3B-4506 [2] LOCKWASHER  
  1S-6420 [2] CLIP  
  3J-1907 [4] SEAL  
  030-3284 [1] HOSE ASSEMBLY  
  2P-1314 [3] CONNECTOR  
  030-7961 [1] ELBOW  
  052-0572 [1] TEE  
  [1] HOSE ASSEMBLY  
  7K-9197 [1] ELBOW  
  6S-8502 [1] HOSE ASSEMBLY  
  2R-6806 [1] CONNECTOR  
  061-9258 [1] TEE  
  3J-7354 [1] SEAL  
  9S-8002 [1] PLUG  
  9J-5487 [1] SPRING  
  2G-1127 [1] PLATE ASSEMBLY  
  1L-1486 [2] SPACER  
  Y   SEPARATE ILLUSTRATION
 

#UEG0807S0343
 

9J-8774: CYLINDER GP STEERING SERVO

9J8774 STEERING CYLINDER GROUP (Change 0)--2" Bore X 5" Stroke
Part of 8D6900 Steering Servo-Receiver Mounting and Cylinder Group shown on Pages 93 and 93B
c226116 UEG0807S
9J8774 CYLINDER GP STEERING SERVO Parts scheme
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 5J-7945 [1] ROD ASSEM.  
    (Includes)
2. 5P-9962 C [1] BEARING  
3. 3H-5823 [2] RING  
4. 6J-0934 [4] BOLT  
5. 3B-4506 [4] LOCKWASHER  
6. 6J-1890 [1] WIPER  
7. 9J-8773 [1] HEAD ASSEM.  
    (Includes)
8. 5J-7884 [1] SEAT  
9. 7B-6368 [1] BALL  
10. 9J-8733 [1] SPRING  
  9J-8734 [1] RETAINER  
11. 5J-7915 [1] TUBE  
12. 5J-7914 [1] PISTON  
13. 5J-7942 [1] RING  
14. 4F-7952 [2] RING  
15. 9J-8772 [1] HEAD ASSEM.  
    (Includes)
16. 5J-7884 [1] SEAT  
17. 7B-6368 [1] BALL  
18. 5P-9962 C [1] BEARING  
19. 3H-5823 [2] RING  
20. 9J-8733 [1] SPRING  
  9J-8734 [1] RETAINER  
21. 1S-0670 [2] RING  
22. 1H-9696 [2] SEAL  
23. 2H-3788 [1] NUT  
24. 5J-7004 [2] SEAL ASSEM.  
25. 6J-1889 [1] SEAL  
26. 5J-7943 [1] RETAINER  
  C   INDICATES CHANGE
 

#UEG0807S0344
 

8J-7376: STEERING CYLINDER GROUP

8J7376 STEERING CYLINDER GROUP--(Change 0-1)--127 mm (5") Bore x 1130 mm (44.40") Stroke--2 Required
Serial No. 45P1 to 45P2070, 2072 to 2112, 2114, 2116 to 2120, 2123, 2125 to 2133,
2135, 2137, 2139, 2140, 2142 & 45P2143 inclusive
c201331 UEG0807S
8J7376 STEERING CYLINDER GROUP Parts scheme
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 5J-5731 [2] NUT  
2. 8J-7372 [1] CYLINDER ASSEM.  
3. 8J-7375 [1] ROD ASSEM.  
4. 9J-1676 [2] BEARING  
5. 7J-5525 [1] PISTON  
6. 5F-3144 [1] SEAL  
7. 2K-4096 [1] RING  
8. 5J-3620 [1] SEAL  
9. 5J-0964 [1] SEAL  
10. 1K-6982 [1] SEAL  
11. 3B-8489 [1] FITTING  
12. 1D-4628 [4] BOLT  
  3B-4514 [4] LOCKWASHER  
13. 6J-9739 [1] HEAD  
14. 5J-5020 [1] SEAL ASSEM.  
15. 4J-3420 [1] RING  
 

#UEG0807S0345
 

3G-5192: CYLINDER GP-STEERING

3G5192 STEERING CYLINDER GROUP--(Change 0 & 1)--127 mm (5") Bore x 1130 mm (44.40") Stroke--2 Required
Serial No. 45P2071, 2113, 2115, 2121, 2122, 2124, 2134, 2136, 2138, 2141 & 45P2144-Up
c222490 UEG0807S
3G5192 CYLINDER GP-STEERING Parts scheme
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 5J-5731 [1] NUT-SELF LOCKING  
2. 3G-5191 [1] CYLINDER AS  
  6J-6043 [2] BEARING-SLEEVE  
3. 8J-7375 [1] ROD AS  
4. 9J-1676 [1] BEARING-SLEEVE  
5. 7J-5525 [1] PISTON  
6. 5F-3144 [1] SEAL-O-RING  
7. 2K-4096 [1] RING  
8. 5J-3620 [1] SEAL-RING  
9. 5J-0964 [1] SEAL-U-CUP  
10. 1K-6982 [1] SEAL-LIP TYPE  
11. 3B-8489 [1] FITTING-GREASE  
12. 1D-4628 [4] BOLT  
  9H-1031 [4] WASHER-HARD  
13. 6J-9739 [1] HEAD  
14. 5J-5020 [1] SEAL AS  
15. 4J-3420 [1] RING-WEAR  
 

#UEG0807S0346
 

5J-8606: STEERING SERVO-MASTER CYLINDER GROUP

5J8606 STEERING SERVO-MASTER CYLINDER GROUP (Change 0-5) 38 mm (1.50") Bore x 240 mm (9.40") Stroke
Serial No. 45P1 to 45P2112 inclusive
c212309 UEG0807S
5J8606 STEERING SERVO-MASTER CYLINDER GROUP Parts scheme
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 5J-8957 R [1] ROD ASSEM.  
    (Includes)
2. 3H-5823 [2] RING  
3. 9M-3914 [1] BEARING  
4. 6J-1879 [1] WIPER  
5. 6J-1878 [1] PACKING  
6. 8M-8157 [2] SEAL  
7. 9S-8001 C [2] PLUG  
  4J-7533 [2] SEAL  
8. 5J-8774 [1] HEAD  
9. 0S-1571 [4] BOLT  
10. 3B-4506 [12] LOCKWASHER  
11. 7J-4082 [1] BODY ASSEM.  
    (Includes)
  5J-8772 [1] BODY  
12. 2D-6642 [2] BALL  
13. 5J-8004 [2] SPRING  
14. 8M-4437 [2] SEAL  
15. 6J-1833 [2] PLUG  
16. 8M-4435 [2] SEAL  
17. 6J-1832 [12] SHIM  
18. 5J-7157 C [2] VALVE  
19. 5J-8792 [1] HEAD ASSEM.  
    (Includes)
20. 9M-3914 [1] BEARING  
21. 3H-5823 [2] RING  
22. 0S-1588 [4] BOLT  
23. 4J-0521 [2] SEAL  
24. 9M-5048 [1] NUT  
25. 5J-9073 [1] RING  
26. 5J-9822 [2] SEAL ASSEM.  
27. 5J-9072 [1] PISTON  
28. 5J-8335 R [1] BODY  
29. 5J-8773 [1] RETAINER  
30. 0S-1591 [4] BOLT  
  C   INDICATES CHANGE
  R   REMFG PART MAY BE AVAILABLE
 

#UEG0807S0347
 

3G-6904: CYLINDER GP-STEER

3G6904 STEERING CYLINDER GROUP--(Change 0-2)--38 mm (1.50") Bore x 240 mm (9.40") Stroke
Serial No. 45P2113-Up. 3G6473 Valve parts are shown on Page 100F
c172178 UEG0807S
3G6904 CYLINDER GP-STEER Parts scheme
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 5J-8957 R [1] ROD ASSEM.  
    (Includes)
2. 3H-5823 [2] RING  
3. 5P-9962 [1] BEARING  
4. 6J-1879 [1] WIPER  
5. 6J-1878 C [1] SEAL  
6. 8M-8157 [2] SEAL  
7. 9S-8001 [2] PLUG  
  4J-7533 [2] SEAL  
8. 5J-8774 [1] HEAD  
9. 0S-1571 [4] BOLT  
10. 3G-6473 Y [1] VALVE GROUP  
    (Separate Illustration)
11. 5J-8792 [1] HEAD ASSEM.  
    (Includes)
12. 5P-9962 [1] BEARING  
13. 3H-5823 [2] RING  
14. 1A-2029 C [4] BOLT  
15. 4J-0521 [2] SEAL  
16. 9M-5048 [1] NUT  
17. 5J-9073 [1] RING  
18. 5J-9822 [2] SEAL ASSEM.  
19. 5J-9072 [1] PISTON  
20. 5J-8335 R [1] BODY  
21. 5J-8773 [1] RETAINER  
22. 3B-1915 C [4] BOLT  
  R   REMFG PART MAY BE AVAILABLE
  Y   SEPARATE ILLUSTRATION
  C   INDICATES CHANGE
 

#UEG0807S0348
 

8J-7730: LINES GP-STEERING

8J7730 STEERING LINES GROUP
Serial No. 45P1 to 1133 and 45P1136 inclusive
c201336 UEG0807S
8J7730 LINES GP-STEERING Parts scheme
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 1P-4577 [8] FLANGE  
2. 0S-1588 [32] BOLT  
3. 4B-4278 [40] WASHER  
4. 8J-7577 [2] HOSE ASSEM.  
    (Each Includes)
  9S-0247 H HOSE 42.10 in.  
5. 3S-7165 [1] STEM ASSEM.  
6. 3S-7166 [2] SLEEVE  
7. 5S-6102 [1] STEM ASSEM.  
8. 4J-0520 [4] SEAL  
9. 4J-5267 [4] SEAL  
10. 1P-4576 [12] FLANGE  
11. 8J-7734 [2] HOSE ASSEM.  
    (Each Includes)
  9S-0247 H HOSE 18.18 in.  
12. 5S-6102 [1] STEM ASSEM.  
13. 3S-7166 [2] SLEEVE  
14. 3S-8363 [1] STEM ASSEM.  
15. 8J-7733 [2] CONNECTION  
16. 5J-7157 [2] VALVE  
  1P-3703 [2] SEAL  
17. 0S-1590 [8] BOLT  
18. 0S-1595 [4] BOLT  
  3B-4508 [4] LOCKWASHER  
  4B-4280 [4] WASHER  
19. 7J-0473 [1] BLOCK ASSEM.  
  H   ORDER BY THE INCH
 

#UEG0807S0349
 

8J-7730: LINES GP-STEERING

8J7730 STEERING LINES GROUP
Serial No. 45P1134, 1135, 1137 to 1306, 1308 to 1311, 1316 to 1318, 1321 to 1324, 1326 & 45P1333 inclusive
c157547 UEG0807S
8J7730 LINES GP-STEERING Parts scheme
  For full view, you need register

Parts for your 621B WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 1P-4577 [8] FLANGE  
2. 0S-1588 C [28] BOLT  
3. 4B-4278 [40] WASHER  
4. 8J-7577 [2] HOSE ASSEM.  
    (Each Includes)
  5P-0180 CH HOSE 106.93 cm(42.10 in.)  
5. 3S-7165 [1] STEM ASSEM.  
6. 3S-7166 [2] SLEEVE  
7. 5S-6102 [1] STEM ASSEM.  
8. 4J-0520 [4] SEAL  
9. 4J-5267 [4] SEAL  
10. 1P-4576 [12] FLANGE  
11. 8J-7734 [2] HOSE ASSEM.  
    (Each includes)
  5P-0180 CH HOSE 46.18 cm(18.18 in.)  
12. 5S-6102 [1] STEM ASSEM.  
13. 3S-7166 [2] SLEEVE  
14. 3S-8363 [1] STEM ASSEM.  
15. 8J-7733 [2] CONNECTION  
16. 5J-7157 [2] VALVE  
  1P-3703 [2] SEAL  
17. 0S-1590 [8] BOLT  
18. 0T-0065 C [4] BOLT  
  7S-2750 C [4] SPACER  
19. 1S-1445 C [2] PLATE  
20. 7J-5732 C [4] CLAMP  
21. 3G-0071 C [1] TUBE ASSEM.  
22. 3G-0069 C [1] TUBE ASSEM.  
23. 0S-1571 C [4] BOLT  
  H   ORDER BY THE CENTIMETRE
 

Information:

Special Instruction
Hydraulic Cylinder Repair Process {7562}
Hydraulic Cylinder Repair Process {7562}
Hydraulic Cylinder Honing {7562}
Hydraulic Cylinder Honing {7562}
Specifications
Steering Cylinder<BR> (8J7376 &amp; 3G5192)
621B, 623B & 627B WHEEL TRACTORS STEERING SYSTEM
Follow-Up Cylinder; For Steering (Sender)<BR> (5J8606 &amp; 3G6904)
621B, 623B & 627B WHEEL TRACTORS STEERING SYSTEM
Follow-Up Cylinder; For Steering (Receiver)<BR> (5J7977 &amp; 9J8774)
621B, 623B & 627B WHEEL TRACTORS STEERING SYSTEM
Reuse And Salvage Guidelines
Testing Hydraulic Cylinders Using the <NOBR>188-3926</NOBR> Caterpillar Cylinder Tester and the <NOBR> 9U-6803</NOBR> Caterpillar Cylinder Tester {0784, 7562}
Testing Hydraulic Cylinders Using the 188-3926 Caterpillar Cylinder Tester and the 9U-6803 Caterpillar Cylinder Tester {0784, 7562}
Hydraulic Cylinder Repair Process {7562}
Hydraulic Cylinder Repair Process {7562}
Hydraulic Cylinder Honing {7562}
Hydraulic Cylinder Honing {7562}
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Inspection and Salvage of Hydraulic Cylinder Components {7562}
Inspection and Salvage of Hydraulic Cylinder Components {7562}
Measuring Bores and Installing Seals in Standard and Oversized Hydraulic Cylinders {5100, 7562}
Measuring Bores and Installing Seals in Standard and Oversized Hydraulic Cylinders {5100, 7562}
Contamination Control Guidelines
Hydraulic Cylinder Honing {7562}
Hydraulic Cylinder Honing {7562}
Applied Failure Analysis
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Hydraulic Cylinder Seal Failure Analysis {7555, 7562}
Bench Test Procedures
Testing Hydraulic Cylinders Using the <NOBR>188-3926</NOBR> Caterpillar Cylinder Tester and the <NOBR> 9U-6803</NOBR> Caterpillar Cylinder Tester {0784, 7562}
Testing Hydraulic Cylinders Using the 188-3926 Caterpillar Cylinder Tester and the 9U-6803 Caterpillar Cylinder Tester {0784, 7562}
Disassembly and Assembly
Steering Cylinders
621 B & 627B TRACTOR-SCRAPER VEHICLE SYSTEMS
Steering Cylinder (Servo-Sender)
621 B & 627B TRACTOR-SCRAPER VEHICLE SYSTEMS
Steering Cylinder (Servo-Receiver)
621 B & 627B TRACTOR-SCRAPER VEHICLE SYSTEMS
Service Magazine
Inspection Procedure For Pin And Bushing Wear In Hitch Components And Steering Linkage{7109,7107,7106,4305,4303}
1980/09/29
Troubleshooting The Steering System{4316,4308,4303}
1981/04/27
Hardened Locknut For Piston In Steering Follow-Up Cylinder{4315}
1982/06/21
New Servo-Receiver Steering Cylinder Group Used {4316}
1984/06/25
Hardened Washers And Spacers Prevent Loose Connection At Follow-Up Cylinder Linkage{7107,4315}
1977/05/16
New Relief Valve And Master Cylinder Used In Steering Follow-Up System{4315,4322}
1978/10/30
New Steering Cylinders Have Bearings In The Cap End And Use Mounting Pins That Can Turn Freely{4303}
1978/11/20
New U-Cup Seal And Spacer(s) Replace Cylinder Rod Packing Seal {5101,5102,5103,5104,5213,5223,5229,5265}
1996/06/10
Correction to Service Magazine , "Inspection Procedure for Pin and Bushing Wear in Hitch Components and Steering Linkage for Wheel Tractor-Scrapers" {4305, 7106, 7107, 7108, 7109}
2000/05/15
New Assembly Instructions for Rod Seals on Hydraulic Cylinders are Available {7562}
2001/09/04
Correctly Assembling the Buffer Seal Will Prevent Failure of the U-Cup Seals {7562}
2001/07/30
Double Lip Wiper Seals Must Be Installed Properly {7562}
2002/12/09
A Rework Procedure Improves the Seal Assembly Performance in Hydraulic Cylinders on Cat Products {7562}
2010/04/30

Caterpillar Parts SIS Catalog 621B :

SHIELD GP-BRAKE
6D-6490 SHIELD GP-BRAKE
6G-6090 SERVICE GP-BRAKE LINING
6G-6070 SERVICE GP-BRAKE LINING
BRAKE GP
8D-8210 BRAKE GP
BRAKE GP
8D-8210 BRAKE GP
BRAKE GP
8D-8210 BRAKE GP
BRAKE GP
8D-8210 BRAKE GP
BRAKE GP
8D-8210 BRAKE GP
CYLINDER & MOUNTING GP
8D-6900 CYLINDER & MOUNTING GP
2G-1100 STEERING FOLLOW-UP SUPPLY GROUP
CYLINDER GP STEERING SERVO
9J-8774 CYLINDER GP STEERING SERVO
STEERING CYLINDER GROUP
8J-7376 STEERING CYLINDER GROUP
CYLINDER GP-STEERING
3G-5192 CYLINDER GP-STEERING
STEERING SERVO-MASTER CYLINDER GROUP
5J-8606 STEERING SERVO-MASTER CYLINDER GROUP
CYLINDER GP-STEER
3G-6904 CYLINDER GP-STEER
LINES GP-STEERING
8J-7730 LINES GP-STEERING

Truck sale:

Caterpillar 621B
 
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MACALLISTER MACHINERY CO., INC
Caterpillar 621B
 
Caterpillar 621B
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MACALLISTER MACHINERY CO., INC
Caterpillar 621B
 
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FINNING CANADA
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QUINN COMPANY
Caterpillar 621B, Road Scraper, Construction
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Caterpillar 621B, Road Scraper, Construction
- Road Scraper
QUINN COMPANY
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