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3N7684 ALTERNATOR GROUP--30 or 32 Volt, 60 Ampere 4N3987 Alternator parts are shown on Pages 76C and 76D D379A


ELECTRICAL AND STARTING SYSTEM
ALTERNATOR GP-CHARGING

MARINE ENGINE D379A MARINE ENGINE 69B
 D379B MARINE ENGINE 69B00824-01226 UEG0046S D379A 69B   (1961)

ELECTRICAL AND STARTING SYSTEM

ALTERNATOR GP-CHARGING
ALTERNATOR GP
5L-1019 ALTERNATOR GP
ALTERNATOR GP
3N-7683 ALTERNATOR GP
ALTERNATOR GP
3N-7684 ALTERNATOR GP
4N-7078 ALTERNATOR GP
4N-7079 ALTERNATOR GP
4N-6300 ALTERNATOR GP-CHARGING
 

#UEG0046S0200
 

3N-7684: ALTERNATOR GP

3N7684 ALTERNATOR GROUP--30 or 32 Volt, 60 Ampere
4N3987 Alternator parts are shown on Pages 76C and 76D
c206956 UEG0046S
3N7684 ALTERNATOR GP Parts scheme
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 4N-3987 RY [1] ALTERNATOR GROUP  
    (Separate Illustration)
2. 8M-7892 B [1] AMMETER (use as required)  
  1H-4560 BC [2] NIPPLE (use as required)  
  F [1] WIRING DIAGRAM  
    (Use without Automatic Start-Stop)
  R   REMFG PART MAY BE AVAILABLE
  Y   SEPARATE ILLUSTRATION
  C   INDICATES CHANGE
  F   NOT SHOWN
  B   USE AS REQUIRED
 

#UEG0046S0201
 

4N-7078: ALTERNATOR GP

4N7078 ALTERNATOR GROUP--24 Volt, 50 Ampere
Replaced by 4N6300 shown on Page 75C
FOR USE WITH ALTERNATOR MOUNTING GROUP SHOWN ON PAGES 75D & 75F
UEG0046S0201 UEG0046S
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
  5S-9088 RY [1] ALTERNATOR GROUP  
  R   REMFG PART MAY BE AVAILABLE
  Y   SEPARATE ILLUSTRATION
 

#UEG0046S0202
 

4N-7079: ALTERNATOR GP

4N7079 ALTERNATOR GROUP--30-32 Volt, 50 Ampere
FOR USE WITH ALTERNATOR MOUNTING GROUP SHOWN ON PAGES 75D & 75F
UEG0046S0202 UEG0046S
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
  1N-9406 Y [1] ALTERNATOR GROUP  
  Y   SEPARATE ILLUSTRATION
 

#UEG0046S0203
 

4N-6300: ALTERNATOR GP-CHARGING

4N6300 ALTERNATOR GROUP--24 Volt, 60 Ampere
UEG0046S0203 UEG0046S
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
  4N-3986 RY [1] ALTERNATOR GROUP  
  R   REMFG PART MAY BE AVAILABLE
  Y   SEPARATE ILLUSTRATION
 

#UEG0046S0204
 

3N-7350: MOUNTING GP-ALTERNATOR

3N7350 ALTERNATOR MOUNTING GROUP--Type 1
c151216 UEG0046S
3N7350 MOUNTING GP-ALTERNATOR Parts scheme
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 2N-7744 [1] SWITCH  
2. 8B-1931 [1] BUSHING  
3. 7B-3235 [1] BOLT  
4. 3B-4508 [3] LOCKWASHER  
5. 2M-0849 [3] WASHER  
6. 3N-5660 [1] STRAP  
7. 3N-7347 [1] PULLEY  
8. 5L-1413 [1] PULLEY  
9. 5L-3980 [1] VEE BELT SET (2 belts)  
10. 0S-1591 [1] BOLT  
11. 3B-4506 [8] LOCKWASHER  
12. 1B-8707 [1] KEY  
13. 3B-1915 [2] BOLT  
14. 4B-4278 [8] WASHER  
15. 3B-5412 [1] NUT  
  [1] COTTER PIN  
  9S-1302 [1] WASHER  
16. 0S-1588 [5] BOLT  
17. 1D-4717 [1] NUT  
18. 3N-5663 [1] BRACKET ASSEM.  
19. 1A-1460 [1] BOLT 2 in. (5.08 cm) long  
  2B-0947 [1] BOLT 2.25 in. (5.72 cm) long  
  1D-4719 [2] NUT  
20. 4B-3388 [2] BOLT  
  [2] NUT  
  3B-4505 [2] LOCKWASHER  
  4B-4277 [2] WASHER  
21. 6L-2845 [1] BRACKET (ammeter mounting)  
22. 3N-7349 [1] GUARD ASSEM.  
  5L-2320 [1] WIRING GROUP  
    (Includes)
  5P-0497 H WIRE (14 gauge) 56.9 dm(224 in.)  
  5P-0606 H WIRE 6 gauge) 30.48 dm(120 in.)  
  2L-8049 [10] TERMINAL (no. 10 screw)  
  2L-8050 [2] TERMINAL .25 in.(.64 cm) screw  
  2L-8051 [1] TERMINAL .313 in.(.8 cm) screw  
  2L-8052 [1] TERMINAL .375 in.(.95 cm) screw  
  2L-8054 J [3] TERMINAL .5 in.(1.27 cm) screw  
    (Use with 6 Gauge Wire)
  2L-8076 [3] TERMINAL (no. 10 screw)  
  2L-8077 [3] TERMINAL .25 in.(.64 cm) screw  
    (Use with 14 Gauge Wire)
  1L-9899 [1] MARKERS (card of)  
  2L-9724 [10] CLIP  
  8L-8413 [8] TIE 5.5 in.(13.97 cm) long  
  3S-2093 [2] TIE 7.31 in.(18.57 cm) long  
  H   ORDER BY THE DECIMETRE
  J   NOT SHOWN
 

#UEG0046S0205
 

3N-7350: MOUNTING GP-ALTERNATOR

3N7350 ALTERNATOR MOUNTING GROUP--Type 2
c157334 UEG0046S
3N7350 MOUNTING GP-ALTERNATOR Parts scheme
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 6L-2845 [1] BRACKET (Ammeter mounting)  
2. 3N-7349 [1] GUARD ASSEM.  
3. 7B-3235 [1] BOLT  
4. 3B-4508 [3] LOCKWASHER  
5. 2M-0849 [3] WASHER  
6. 3N-5660 [1] STRAP  
7. 3N-7347 [1] PULLEY  
8. 5L-1413 [1] PULLEY  
9. 5L-3980 [1] VEE BELT SET (2 belts)  
10. 0S-1591 [1] BOLT  
11. 3B-4506 [8] LOCKWASHER  
12. 1B-8707 [1] KEY  
13. 3B-1915 [2] BOLT  
14. 5M-2894 C [8] WASHER  
15. 3B-5412 [1] NUT  
  [1] COTTER PIN  
  9S-1302 [1] WASHER  
16. 0S-1588 [5] BOLT  
17. 1D-4717 [1] NUT  
18. 3N-5663 [1] BRACKET ASSEM.  
19. 1A-1460 [1] BOLT 2 in.(5.08 cm) long  
  2B-0947 [1] BOLT 2.25 in.(5.72 cm) long  
  1D-4719 [2] NUT  
20. 4B-3388 [2] BOLT  
  [2] NUT  
  3B-4505 [2] LOCKWASHER  
  4B-4277 [2] WASHER  
  5L-2320 [1] WIRING GROUP  
    (Includes)
  5P-0497 H WIRE (14 gauge) 56.9 dm(224 in.)  
  5P-0606 H WIRE 6 gauge) 30.48 dm(120 in.)  
  2L-8049 [10] TERMINAL (no. 10 screw)  
  2L-8050 [2] TERMINAL .25 in.(.64 cm) screw  
  2L-8051 [1] TERMINAL .313 in.(.8 cm) screw  
  2L-8052 [1] TERMINAL .375 in.(.95 cm) screw  
  2L-8054 J [3] TERMINAL .5 in.(1.27 cm) screw  
    (Use with 6 Gauge Wire)
  2L-8076 [3] TERMINAL (no. 10 screw)  
  2L-8077 [3] TERMINAL .25 in.(.64 cm) screw  
    (Use with 14 Gauge Wire)
  1L-9899 [1] MARKERS (card of)  
  2L-9724 [10] CLIP  
  8L-8413 [8] TIE 5.5 in.(13.97 cm) long  
  3S-2093 [2] TIE 7.31 in.(18.57 cm) long  
  C   INDICATES CHANGE
  H   ORDER BY THE DECIMETRE
  J   NOT SHOWN
 

#UEG0046S0206
 

5L-1243: ALTERNATOR AS

5L1243 ALTERNATOR ASSEMBLY--32 Volt, 60 Ampere
Part of 5L1019 Alternator Group shown on Pages 74A & 75
c115386 UEG0046S
5L1243 ALTERNATOR AS Parts scheme
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
  9B-8934 [2] STUD ASSEM.  
  4B-2051 [4] NUT  
  1L-6314 C [4] LOCKWASHER  
  9B-8932 [2] WASHER  
  3F-3711 [2] WASHER  
  5L-4279 [1] STUD  
  5L-4426 [2] NUT  
  8H-3481 [2] LOCKWASHER  
  3F-9556 [1] LOCKWASHER  
  7F-4920 [1] WASHER  
  5L-4277 [2] BUSHING  
  6L-4468 [1] CONNECTOR  
  5L-6488 [1] SLIP RING ASSEM.  
    (PART OF ROTOR ASSEM. 5L6487)
  5M-3114 C [1] BEARING  
  5L-4285 [1] BRACKET  
  6L-3661 [3] WIRE ASSEM.  
  5L-8412 [1] FRAME ASSEM.  
  5L-4282 [4] BUSHING  
  5L-4507 [2] SCREW  
  7H-2079 [2] LOCKWASHER  
  3H-0240 [2] WASHER  
  9B-9178 [1] SCREW  
  8H-3481 [1] LOCKWASHER  
  5L-6487 [1] ROTOR ASSEM.  
  5L-4286 [1] STATOR ASSEM.  
  5L-4274 [1] CONNECTOR  
  5L-4283 [4] BOLT  
  5L-6483 H [3] KIT (POSITIVE RECTIFIER)  
  5L-6484 H [3] KIT (NEGATIVE RECTIFIER)  
  5L-6485 H [1] KIT (BRUSH REPLACEMENT)  
  6L-4853 H [1] KIT (TERMINAL AND HOLDER)  
  5L-4273 [1] FRAME  
  5L-6489 [1] RETAINER  
  5L-4284 [1] GASKET  
  6B-0924 [1] BEARING  
  9B-8935 [1] COLLAR  
  1B-8704 [1] KEY  
  6L-4153 [1] NUT  
  4L-0573 [1] WASHER  
  9B-9113 [1] WASHER  
  5L-4276 [1] RETAINER  
  5L-6490 [3] SCREW  
  9F-8125 [3] LOCKWASHER  
  5L-4203 [1] FAN AND BAFFLE ASSEM.  
  C   INDICATES CHANGE
  H   NOT PART OF 5L1243 ALTERNATOR
 

#UEG0046S0207
 

4N-3986: ALTERNATOR GP

4N3986 ALTERNATOR GROUP--24 Volt, 60 Ampere--End View--Part 1 of 2
Part of 3N7683 and 4N6300 Alternator Groups shown on Pages 75A and 75C
c202839 UEG0046S
4N3986 ALTERNATOR GP Parts scheme
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 9S-2544 [7] SCREW  
2. 8H-0878 [7] LOCKWASHER  
3. 6N-1871 [1] LEAD ASSEM.  
4. 6N-1944 [1] DIODE ASSEM.  
5. 9N-0941 [2] INSULATOR  
6. 6N-1869 [4] NUT ASSEM.  
7. 6N-1925 [1] BRACKET  
8. 6N-1946 [1] CAPACITOR  
9. 6N-1872 [3] SCREW ASSEM.  
10. 9N-0938 [3] WASHER .062 in. (1.57 mm)thick  
11. 3H-0240 [5] WASHER .031 in. (.79 mm) thick  
12. 6N-1874 [1] REGULATOR ASSEM.  
13. 9N-0940 [1] BOOT  
14. 6N-1873 [1] LEAD ASSEM.  
15. 9L-6772 [1] CONNECTOR  
16. 9L-6771 [1] CAP  
17. 8M-6701 [3] WASHER  
  6N-1856 [4] BUSHING  
18. 6N-1870 [2] SCREW ASSEM.  
 

#UEG0046S0208
 

4N-3986: ALTERNATOR GP

4N3986 ALTERNATOR GROUP--24 Volt, 60 Ampere--Side View--Part 2 of 2
Part of 3N7683 and 4N6300 Alternator Groups shown on Pages 75A and 75C
c204412 UEG0046S
4N3986 ALTERNATOR GP Parts scheme
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 6N-1876 [1] HOUSING ASSEM.  
    (Includes)
2. 9S-2396 [1] BUSHING  
3. 9N-0943 [1] PLUG  
4. 5P-3418 [1] BEARING  
5. 6N-1968 [1] STATOR ASSEM.  
    (Includes)
6. 9S-2014 [3] TERMINAL  
  9N-0939 [1] GROMMET  
7. 2P-5616 [1] FRAME  
8. 9S-2390 [1] RETAINER ASSEM.  
    (Includes)
9. 9S-2391 [1] SEAL  
10. 9S-2256 [1] GASKET  
11. 2F-5721 [1] BEARING  
12. 9S-2252 [1] SLINGER  
13. 9S-2391 [1] SEAL  
14. 7F-7621 [1] WASHER  
15. 2K-4821 [1] NUT  
16. 9S-2254 [1] COLLAR  
17. 9S-2008 [4] SCREW  
18. 9S-2258 [1] FAN  
19. 9S-2261 [1] COLLAR  
20. 9S-2009 [4] BOLT  
21. 9S-2302 [1] ROTOR ASSEM.  
22. 6N-1945 [1] FIELD COIL  
23. 9S-2007 C [5] SCREW  
24. 9N-0942 [1] PLATE  
25. 5P-3419 [1] RACE  
26. 9N-0937 [1] RECTIFIER ASSEM.  
    THE FOLLOWING REPAIR KITS ARE AVAILABLE:
  6N-1875 C [1] KIT (terminal)  
    (Includes Terminal and Load, BUSHING, WASHERS, NUTS AND LOCKWASHERS)
  C   INDICATES CHANGE
 

#UEG0046S0209
 

4N-3987: ALTERNATOR GP

4N3987 ALTERNATOR GROUP--32 Volt, 60 Ampere--End View--Part 1 of 2
Part of 3N7684 Alternator Group shown on Page 75A
c202837 UEG0046S
4N3987 ALTERNATOR GP Parts scheme
  For full view, you need register

Parts for your D379A MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 9S-2544 [7] SCREW  
2. 8H-0878 [7] LOCKWASHER  
3. 6N-1871 [1] LEAD ASSEM.  
4. 6N-1944 [1] DIODE ASSEM.  
5. 9N-0941 [2] INSULATOR  
6. 6N-1869 [4] NUT ASSEM.  
7. 6N-1925 [1] BRACKET  
8. 6N-1946 [1] CAPACITOR  
9. 6N-1872 [3] SCREW ASSEM.  
10. 9N-0938 [3] WASHER  
11. 3H-0240 [5] WASHER  
12. 6N-1874 [1] REGULATOR ASSEM.  
13. 9N-0940 [1] BOOT  
14. 6N-1873 [1] LEAD ASSEM.  
15. 6N-1877 [1] CONNECTOR  
16. 9L-6771 [1] CAP  
17. 8M-6701 [3] WASHER  
  6N-1856 [4] BUSHING  
18. 6N-1870 [2] SCREW ASSEM.  
 

Information:

Engine News
New Regulator And Field Coil Assemblies Used
1981/11/25
FT1808 Cable Permits Easier Use Of 6V2100 Multitach To Check Engine Or Alternator RPM
1984/01/18
Identification Of External Terminals On Alternators
1987/04/01
Remanufactured Heavy-Duty Starters And High-Amp Alternators
1987/06/01
8T5314 Socket Adapter Available To Correctly Install Alternator Pulley Nut
1988/01/01
Repair Parts Available for Alternator R-Terminal {1405}
2000/12/01
Harness Repair of Alternator R-Terminal Connector {1405}
2000/12/01
Charging System Troubleshooting Guide Has Been Updated for All Engines {1406, 7569}
Charging System Troubleshooting Guide Has Been Updated for All Engines {1406, 7569}
Special Instruction
Upgrading Alternators To Include An Integrated Circuit Regulator{1405, 1410}
Upgrading Alternators To Include An Integrated Circuit Regulator{1405, 1410}
Charging System Troubleshooting {1406}
Charging System Troubleshooting {1406}
Procedure for Replacing Regulator Kit on All Engines {1405}
Procedure for Replacing Regulator Kit on All Engines {1405}
Procedure to Install Brush Holder Assembly to End Frame on All Engines {1405}
Procedure to Install Brush Holder Assembly to End Frame on All Engines {1405}
Specifications
Alternators And Regulators
D379, D398, D399 INDUSTRIAL & MARINE ENGINES
Alternator Regulators
D379, D398, D399 INDUSTRIAL & MARINE ENGINES
Generator Regulator
D379, D398, D399 INDUSTRIAL & MARINE ENGINES
Alternator
30SI Series and 34SI Series Alternator
Systems Operation
General Information
30SI Series and 34SI Series Alternator
Normal Operation
30SI Series and 34SI Series Alternator
Component Description
30SI Series and 34SI Series Alternator
Testing and Adjusting
T1 Alternator Output - Test
30SI Series and 34SI Series Alternator
T2 Electrical System Current - Test
30SI Series and 34SI Series Alternator
T3 Charging System - Test
30SI Series and 34SI Series Alternator
T4 Alternator Drive System - Check
30SI Series and 34SI Series Alternator
T5 Alternator Current - Test
30SI Series and 34SI Series Alternator
T6 Residual Magnetism Restoration
30SI Series and 34SI Series Alternator
T7 Identifying Source of Current Draw - Test
30SI Series and 34SI Series Alternator
T8 Alternator Overcharging - Test
30SI Series and 34SI Series Alternator
General Information
30SI Series and 34SI Series Alternator
Initial Troubleshooting Procedure
30SI Series and 34SI Series Alternator
Component - Test
30SI Series and 34SI Series Alternator
Disassembly and Assembly
Alternator - Disassemble
30SI Series and 34SI Series Alternator
Alternator - Assemble
30SI Series and 34SI Series Alternator
Service Magazine
New Regulator And Field Coil Assemblies Used{1410,1405}
1981/11/23
Voltage Regulator Cross Reference Chart{1410,1405}
1985/07/01
Identification Of External Terminals On Alternators{1405,1406,1400}
1987/03/23
Alternator "R" Terminal Wire Assembly Available For Wiring Harness Repair{1408}
1987/05/04
Alternator/Generator Output Test On The Engine{1401,1404,1405,1406}
1987/05/04
Check Alternator Output Connection Prior To Machine Delivery{1405}
1987/05/18
Remanufactured Heavy-Duty Starters And High-Amp Alternators{1405,1453}
1987/05/25
Correct Torque Value For Alternator Drive Pulley Retaining Nut Is Important{1405}
1987/11/23
8T5314 Socket Adapter Available To Correctly Install Alternator Pulley Nut {0601}
1988/01/25
New 35-Ampere Alternator Used On Some Engines In Caterpillar Equipment{1405,1406}
1979/08/13
Voltage Regulator Can Cause Variable Ammeter Indications{1410,1401,1405,1406,7467}
1979/10/22
Repair Parts Available for Alternator R-Terminal {1405}
2000/10/02
Harness Repair of Alternator R-Terminal Connector {1405, 1408, 7553}
2000/10/02
Charging System Troubleshooting Guide Has Been Updated for All Machines {1406, 7569}
Charging System Troubleshooting Guide Has Been Updated for All Machines {1406, 7569}

Caterpillar Parts SIS Catalog D379A :

ALTERNATOR GP
3N-7683 ALTERNATOR GP
ALTERNATOR GP
5L-1019 ALTERNATOR GP
ALTERNATOR GP
5L-1019 ALTERNATOR GP
ALTERNATOR GP
5L-1019 ALTERNATOR GP
TERMINAL & PLATE AS
7N-1269 TERMINAL & PLATE AS
SWITCH AS-SOLENOID
5L-8595 SWITCH AS-SOLENOID
JUNCTION BOX GP
5L-2592 JUNCTION BOX GP
SWITCH AS-SOLENOID
5L-8595 SWITCH AS-SOLENOID
4N-7078 ALTERNATOR GP
4N-7079 ALTERNATOR GP
4N-6300 ALTERNATOR GP-CHARGING
MOUNTING GP-ALTERNATOR
3N-7350 MOUNTING GP-ALTERNATOR
MOUNTING GP-ALTERNATOR
3N-7350 MOUNTING GP-ALTERNATOR
ALTERNATOR AS
5L-1243 ALTERNATOR AS
ALTERNATOR GP
4N-3986 ALTERNATOR GP
ALTERNATOR GP
4N-3986 ALTERNATOR GP

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