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7D4180 PARKING BRAKE CONTROL GROUP--Part 2 of 2--Type 2 Serial No. 23H4299 to 23H4453 inclusive Also part of 7J9592 and 7D4740 Parking Brake Control Arrangements listed on Pages 195 and 195B 6D3781 and 6D5217 Rotochamber parts are shown on Page 195 and 199 621


BRAKING SYSTEM
CONTROL GP
CHAMBER AS-BRAKE
VALVE GP
CHAMBER AS-BRAKE
ELECTRICAL AND STARTING SYSTEM
ALARM GP

WHEEL TRACTOR 621 WHEEL TRACTOR 23H
 621 TRACTOR 23H04299-UP (MACHINE) UEG0630S 621 23H   (1966)

BRAKING SYSTEM

CONTROL GP
PARKING BRAKE CONTROL GROUP
7D-4180 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
7D-4180 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
7D-4180 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
8D-8660 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
8D-8660 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
7J-5103 PARKING BRAKE CONTROL GROUP
 

#UEG0630S0450
 

7D-4180: PARKING BRAKE CONTROL GROUP

7D4180 PARKING BRAKE CONTROL GROUP--Part 2 of 2--Type 2
Serial No. 23H4299 to 23H4453 inclusive
Also part of 7J9592 and 7D4740 Parking Brake Control Arrangements listed on Pages 195 and 195B
6D3781 and 6D5217 Rotochamber parts are shown on Page 195 and 199
c133457 UEG0630S
7D4180 PARKING BRAKE CONTROL GROUP Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 6D-5217 Y [2] ROTOCHAMBER ASSEM.  
    (See Separate Illustration)
2. 2B-7409 [2] PLUG  
3. 0L-1351 [2] BOLT  
  1D-4717 [2] NUT  
  3B-4506 [2] LOCKWASHER  
4. 6D-3781 Y [2] VALVE ASSEM.  
    (See Separate Illustration)
5. 5D-5911 [4] HOSE ASSEM. (11" long overall)  
    (Ref. No. 4 to Ref. No. 1)
6. 8B-1261 [2] TEE  
  3B-7738 [2] NIPPLE  
7. 2M-9352 [1] VALVE ASSEM.  
8. 6D-3979 [1] BRACKET  
9. 4B-4158 [4] SCREW  
10. 8S-6532 [1] PLATE (Instruction)  
11. 8H-7696 [1] FITTING  
12. 7D-7767 [1] HOSE ASSEM. (48" long overall)  
    (Ref. No. 7 to Air Compressor)
13. 6D-8288 [1] BELLCRANK ASSEM.  
14. 7B-0503 [1] BALLSTUD  
    (Part of 6D8288 Assem.)
15. 5F-3399 [1] SPACER  
16. 4S-6667 [1] HOSE ASSEM. (24" long overall)  
    (Ref. No. 4 to Ref. No. 19)
17. 5H-4778 [5] UNION  
18. 7B-0192 [1] CROSS  
19. 4S-7529 [1] HOSE ASSEM. (38" long overall)  
    (Ref. No. 4 to Ref. No. 16)
20. 3D-8884 [2] ELBOW  
21. 4H-6147 [2] UNION  
  Y   SEPARATE ILLUSTRATION
 

#UEG0630S0451
 

8D-8660: PARKING BRAKE CONTROL GROUP

8D8660 PARKING BRAKE CONTROL GROUP--Part 1 of 2
Serial No. 23H4454-Up
Also part of 8D8690 Parking Brake Control Arrangement listed on Page 195B
4F6941 and 6D3782 Valve parts are shown on Pages 117 and 200
c117046 UEG0630S
8D8660 PARKING BRAKE CONTROL GROUP Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 4D-2560 [1] UNION  
2. 4S-6667 [1] HOSE ASSEM. (24 in. long)  
3. 7D-3963 [1] HOSE ASSEM. (144 in. long)  
4. 5H-4778 [3] UNION  
5. 2B-7409 [1] PLUG  
6. 4F-6941 Y [1] VALVE ASSEM.  
    (Separate Illustration)
7. 3B-7722 [1] BUSHING  
8. 5H-8936 [1] ADAPTER  
9. 7D-7376 [1] PANEL  
10. 8H-7696 [1] FITTING  
11. 6D-3782 Y [1] VALVE ASSEM.  
    (Separate Illustration)
12. 2B-2695 [2] BOLT  
  1D-4716 [2] NUT  
  3B-4505 [2] LOCKWASHER  
  3P-2027 [1] FILM (Warning Parking Brake)  
  Y   SEPARATE ILLUSTRATION
 

#UEG0630S0452
 

8D-8660: PARKING BRAKE CONTROL GROUP

8D8660 PARKING BRAKE CONTROL GROUP--Part 2 of 2
Serial No. 23H4454-Up
Also part of 8D8690 Parking Brake Control Arrangement listed on Page 195B
6D3781 Valve and 6D5217 Rotochamber parts are shown on Pages 195 and 199
c117086 UEG0630S
8D8660 PARKING BRAKE CONTROL GROUP Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 6D-5217 Y [2] ROTOCHAMBER ASSEM.  
    (Separate Illustration)
2. 2B-7409 [2] PLUG  
3. 0L-1351 [2] BOLT  
  1D-4717 [2] NUT  
  3B-4506 [2] LOCKWASHER  
4. 6D-3781 Y [2] VALVE ASSEM.  
    (Separate Illustration)
5. 5D-5911 [4] HOSE ASSEM. (11 in. long)  
6. 8B-1261 [2] TEE  
  3B-7738 [2] NIPPLE  
7. 2M-9352 [1] VALVE ASSEM.  
8. 6D-4044 [1] HOSE ASSEM. (57 in. long)  
9. 4S-7606 [1] UNION  
10. 4H-6147 [2] UNION  
11. 8H-7696 [1] FITTING  
12. 7D-4955 [1] HOSE ASSEM. (79 in. long)  
13. 4S-7529 [1] HOSE ASSEM. (38 in. long)  
14. 3D-8884 [2] ELBOW  
15. 5F-3399 [1] SPACER  
16. 4S-6667 [1] HOSE ASSEM. (24 in. long)  
17. 5H-4778 [5] UNION  
18. 7B-0192 [1] CROSS  
  Y   SEPARATE ILLUSTRATION
 

#UEG0630S0453
 

7J-5103: PARKING BRAKE CONTROL GROUP

7J5103 PARKING BRAKE CONTROL GROUP--Type 1
Part of 7D4740 Parking Brake Control Arrangement listed on Page 195
2R618 Valve and 7J4430 Rotochamber parts are shown on Pages 200 and 201
c134521 UEG0630S
7J5103 PARKING BRAKE CONTROL GROUP Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 2R-0618 Y [2] VALVE ASSEM.  
    (See Separate Illustration)
  2B-7409 [2] PLUG  
2. 6B-2982 [2] TEE  
3. 3D-8884 [3] ELBOW  
4. 3B-7722 [3] BUSHING  
5. 9M-8406 [7] CLIP  
6. 6D-7732 [1] HOSE ASSEM. (67" long overall)  
7. 5H-4778 [5] UNION  
8. 6D-1432 [1] VALVE ASSEM.  
9. 6D-6018 [1] CROSS  
10. 4S-7558 [1] HOSE ASSEM. (89" long overall)  
11. 4H-6147 [3] UNION  
12. 6D-9594 [2] BLOCK  
13. 7J-0703 [1] HOSE ASSEM. (140" long overall)  
14. 7D-3957 [1] HOSE ASSEM. (70" long overall)  
15. 7J-7220 [1] HOSE ASSEM. (235" long overall)  
16. 4J-3914 [1] UNION  
17. 6D-4482 [1] CONNECTOR  
  1D-6306 [1] NUT  
  4F-7506 [1] WASHER  
18. 2D-0193 [1] UNION  
19. 3D-6388 [1] HOSE ASSEM. (44" long overall)  
20. 2L-3331 [2] UNION  
21. 3B-7262 [2] NIPPLE  
22. 7J-4430 Y [2] ROTOCHAMBER ASSEM.  
    (See Separate Illustration)
  5M-6213 [2] PLUG  
  9S-1319 [4] WASHER  
23. 5D-5911 [2] HOSE ASSEM. (11" long overall)  
  Y   SEPARATE ILLUSTRATION
 

#UEG0630S0454
 

7J-5103: PARKING BRAKE CONTROL GROUP

7J5103 PARKING BRAKE CONTROL GROUP--Type 2
Part of 7D4740 Parking Brake Control Arrangement listed on Page 195
2R618 Valve and 7J4430 Rotochamber parts are shown on Pages 200 and 201
c205682 UEG0630S
7J5103 PARKING BRAKE CONTROL GROUP Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. Y [2] VALVE ASSEM.  
    (Separate Illustration)
  2B-7409 [2] PLUG  
2. 6B-2982 [2] TEE  
3. 3D-8884 C [2] ELBOW  
4. 3B-7722 [3] BUSHING  
5. 9M-8406 [7] CLIP  
6. 6D-7732 HOSE ASSEM. 67 in.(17.02 dm)  
7. 5H-4778 C [6] UNION  
8. 6D-1432 [1] VALVE ASSEM.  
9. 6D-6018 [1] CROSS  
10. 4S-7558 [1] HOSE ASSEM. 89 in.(22.61 dm)  
11. 4H-6147 C [2] UNION  
12. 6D-9594 [2] BLOCK  
13. 7J-0703 [1] HOSE ASSEM. 140 in.(35.56 dm)  
14. 7D-3957 [1] HOSE ASSEM. 70 in.(17.78 dm)  
15. 8J-9065 C [1] HOSE ASSEM. 246 in.(59.69 dm)  
16. 4J-3914 [1] UNION  
17. 6D-4482 [1] CONNECTOR  
  1D-6306 [1] NUT  
  4F-7506 [1] WASHER  
18. 2D-0193 [1] UNION  
19. 3D-6388 [1] HOSE ASSEM. 44 in.(11.18 dm)  
20. 2L-3331 [2] UNION  
21. 3B-7262 [2] NIPPLE  
22. 7J-4430 Y [2] ROTOCHAMBER ASSEM.  
    (Separate Illustration)
  5M-6213 [2] PLUG  
  9S-1319 [4] WASHER  
23. 5D-5911 [2] HOSE ASSEM. 11 in.(2.79 dm)  
  C   INDICATES CHANGE
  Y   SEPARATE ILLUSTRATION
 

#UEG0630S0455
 

6D-5217: ROTOCHAMBER ASSEMBLY

6D5217 ROTOCHAMBER ASSEMBLY
Part of 7D4180 Brake Control Group shown on Page 197
c168111 UEG0630S
6D5217 ROTOCHAMBER ASSEMBLY Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
  7D-0919 [1] KIT (rotochamber)  
    (Includes Springs, Boot, Felt, Diaphragm, Pin Seals, & Hardware)
  2G-2509 C [1] SEAL KIT (Includes 3 Seals)  
1. 7D-0922 [1] CLAMP ASSEM.  
2. 1B-4201 [8] NUT (fine thread)  
    -OR-
  1B-4330 C [8] NUT (coarse thread)  
3. 3B-4504 [8] LOCKWASHER  
4. 8F-7334 [1] BODY  
5. 8F-7333 [1] CLAMP ASSEM.  
6. 8F-7330 [1] GUIDE  
7. 5M-3062 [8] BOLT  
8. 7D-0961 [8] WASHER  
9. 3B-4510 [2] LOCKWASHER  
10. 9S-1354 [3] NUT  
11. 0S-2564 [2] STUD  
12. 8F-9838 [1] YOKE ASSEM.  
    (Includes)
  8F-9837 [1] BODY  
13. 8S-6154 [1] PIN  
14. 3B-5301 [1] COTTER PIN  
15. 7D-2148 [1] BOOT  
16. 7D-0926 [1] ROD  
17. 7D-0962 [8] ROLLER  
18. 1B-4202 [8] NUT (fine thread)  
    -OR-
  1D-4716 C [8] NUT (coarse thread)  
19. 3B-4505 [8] LOCKWASHER  
20. 8D-3285 [1] PISTON  
21. 7D-4361 [1] RING (retainer)  
22. 8D-3283 [1] CAP  
23. 2G-5586 C [1] GUARD  
24. 2G-5539 C [1] COLLAR  
25. 4B-1229 C [4] SCREW  
  8F-1434 C [4] LOCKWASHER  
26. 2G-9437 C [1] COVER  
27. 2G-9439 C [1] BEARING  
28. 2G-9436 C [1] SHAFT  
  C   INDICATES CHANGE
 

#UEG0630S0456
 

6D-3782: VALVE AS

6D3782 EMERGENCY CONTROL VALVE ASSEMBLY
Part of 7D4180 Parking Brake Control Group shown on Page 196
c128226 UEG0630S
6D3782 VALVE AS Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 7D-5346 [1] LEVER  
2. 7H-3986 [2] SCREW  
3. 7D-5342 [1] POSITIONER  
4. 7D-5341 [1] SPRING  
5. 4M-5281 [2] BOLT  
  3B-4504 [2] LOCKWASHER  
6. 4J-3961 [2] SPRING  
7. 4J-3957 [2] SPRING  
8. 2S-4663 [1] SEAL  
9. 4J-3960 [2] VALVE  
10. 5F-9144 [2] SEAL  
 

#UEG0630S0457
 

2R-0618: VALVE AS-CHECK

2R618 DOUBLE CHECK VALVE ASSEMBLY
Part of 7J5103 Parking Brake Control Group shown on Page 198
c77805 UEG0630S
2R0618 VALVE AS-CHECK Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 2R-1532 [1] GUIDE  
2. 3D-4869 [1] SHUTTLE  
3. 2R-9613 [1] CAP  
4. 0S-1615 [2] BOLT  
  3B-4504 [2] LOCKWASHER  
  4D-3365 [2] WASHER  
5. 3D-4245 [1] SEAL  
 

#UEG0630S0458
 

7J-4430: ROTOCHAMBER AS

7J4430 ROTOCHAMBER ASSEMBLY
Part of 7J5103 Parking Brake Control Group shown on Page 198
c212319 UEG0630S
7J4430 ROTOCHAMBER AS Parts scheme
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 7D-0922 [1] CLAMP ASSEM.  
2. 1B-4201 C [8] NUT (fine thread)  
    -OR-
  1B-4330 C [8] NUT (coarse thread)  
3. 3B-4504 [8] LOCKWASHER  
4. 8F-7334 [1] BODY  
5. 8F-7333 [1] CLAMP ASSEM.  
6. 8F-7330 [1] GUIDE  
7. 5M-3062 [8] BOLT  
8. 7D-0961 [8] WASHER  
9. 3B-4510 [2] LOCKWASHER  
10. 9S-1354 [3] NUT  
11. 7D-4361 [1] RING  
12. 8F-9838 [1] YOKE ASSEM.  
    (Includes)
  8F-9837 [1] BODY  
13. 8S-6154 [1] PIN  
14. 3B-5301 [1] COTTER PIN  
15. 7D-2148 [1] BOOT  
16. 7J-4431 [1] ROD  
17. 7D-0962 [8] ROLLER  
18. 1B-4202 [8] NUT  
19. 3B-4505 [8] LOCKWASHER  
20. 0S-2564 C [2] STUD  
21. 2G-5586 C [1] GUARD  
22. 2G-5539 C [1] COLLAR  
23. 8D-3285 C [1] PISTON  
24. 8D-3283 C [1] CAP  
    THE FOLLOWING REPAIR KITS ARE AVAILABLE:
  7D-0919 [1] KIT (rotochamber)  
    (Consists of such parts as Springs, Boot, Felt, Diaphragm, Pin, "O" Rings and Hardware)
  2G-2509 [1] KIT (seal)  
    (Includes 3 seals)
  C   INDICATES CHANGE
 

#UEG0630S0459
 

8D-4905: BACK UP WARNING ARRANGEMENT

8D4905 BACK UP WARNING ARRANGEMENT--Factory Installation
UEG0630S0459 UEG0630S
  For full view, you need register

Parts for your 621 WHEEL TRACTOR:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
  8D-4805 Y [1] BACK-UP WARNING GROUP TRACTOR  
  8D-4835 Y [1] BACK-UP WARNING GROUP SCRAPER  
  Y   SEPARATE ILLUSTRATION
 

Information:

Reuse And Salvage Guidelines
Final Drive Steering System, Wheel Braking System, and Wheels & Tires Salvage and Reuse Manual Contents {4000, 4050, 4100, 4250, 4300}
Final Drive Steering System, Wheel Braking System, and Wheels & Tires Salvage and Reuse Manual Contents {4000, 4050, 4100, 4250, 4300}
Disassembly and Assembly
Brake Control Valve
621 & 623 TRACTOR-SCRAPER POWER TRAIN
Service Magazine
Color Coded Dust Caps for S·O·S Ports Will Be Available {7770}
2003/12/01

Caterpillar Parts SIS Catalog 621 :

PARKING BRAKE CONTROL GROUP
7D-4180 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
7D-4180 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
7D-4180 PARKING BRAKE CONTROL GROUP
7J-9592 PARKING BRAKE CONTROL ARRANGEMENT
8D-8690 PARKING BRAKE CONTROL ARRANGEMENT
PARKING BRAKE CONTROL GROUP
7J-9523 PARKING BRAKE CONTROL GROUP
VALVE GP-CHECK
6D-3781 VALVE GP-CHECK
VALVE GP-CHECK
6D-3781 VALVE GP-CHECK
PARKING BRAKE CONTROL GROUP
8D-8660 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
8D-8660 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
7J-5103 PARKING BRAKE CONTROL GROUP
PARKING BRAKE CONTROL GROUP
7J-5103 PARKING BRAKE CONTROL GROUP
ROTOCHAMBER ASSEMBLY
6D-5217 ROTOCHAMBER ASSEMBLY
VALVE AS
6D-3782 VALVE AS
VALVE AS-CHECK
2R-0618 VALVE AS-CHECK
ROTOCHAMBER AS
7J-4430 ROTOCHAMBER AS

Truck sale:

Caterpillar 621K WT, water trucks, Transport
699,500 
Caterpillar 621K WT, water trucks, Transport
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HOLT OF CALIFORNIA
Caterpillar 621K, Road Scraper, Construction
379,500 
Caterpillar 621K, Road Scraper, Construction
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ALTORFER INC.
 
826,455 
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500,000 
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HOLT CAT
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435,000 
Caterpillar 621K, Road Scraper, Construction

CAROLINA CAT
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