C18 Generator Set Caterpillar

Removal Procedure

Remove The Exciter Field and Remove The Exciter Armature

Illustration 1	g02174575

1. Remove the side and rear access panels from the generator.

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Illustration 2	g00619559
Voltage Regulator "F1" and "F2" first terminate at a voltage regulator.

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Illustration 3	g00619563
Terminal Strip "F1" and "F2" first terminate at a terminal strip. (1) Wires "F1" and "F2"

2. Disconnect exciter wires ("F1" and "F2") from the first termination point. These wires terminate at the voltage regulator or at a terminal strip.

   For permanent magnet pilot excited generators, disconnect wires "26", "28", and "30" from the first termination point. These wires first terminate at fuses. These fuses are located on a terminal strip or these fuses are located in the harness.

   Pull the disconnected wires from the harness bundles and place the disconnected wires near the exciter field.

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Illustration 4	g00619588
Six-Diode Rectifier Block (One Piece) (2) Screws (3) Mounting Assembly

3. Various rectifier blocks and mounting hardware are used. The rectifier blocks and the mounting plate must be removed in order to remove the exciter. Disconnect the two generator leads from the rectifier blocks. Also, disconnect the three exciter leads from the rectifier blocks.

   Generators with the six-diode rectifier block, remove two allen head screws (2) which fasten the six-diode rectifier block and mounting assembly (3) to the rotor. Remove the six-diode rectifier block and mounting assembly (3) .

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Illustration 5	g00619592
Generator with Outboard PM Pilot Exciter (4) Bolts (5) Mounting Assembly (6) Retainer

4. On generators with an outboard PM pilot exciter, perform the following procedure:

   1. Remove four bolts (4) which fasten retainer (6) and mounting assembly (5) to the rotor shaft.

   2. Remove retainer (6) and mounting assembly (5). Ensure that the diode rectifier blocks remain attached.

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Illustration 6	g00619603
Generator with Outboard PM Pilot Exciter (7) Bolts (8) Rotating Pilot Exciter Field (9) Stationary Pilot Exciter Armature

5. On generators with an outboard PM pilot exciter, perform the following procedure:

   Note: The magnetism between pilot exciter armature (9) and pilot exciter field (8) is strong. The components may come off at the same time.

   1. Remove four bolts (7) which fasten stationary pilot exciter armature (9) to the generator.

   2. Remove stationary pilot exciter armature (9) and rotating pilot exciter field (8) .

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Illustration 7	g00619613
Shroud and Exciter Field (10) Shroud (11) Exciter Field (12) Bolts

6. If equipped, remove four bolts (12) which fasten shroud (10) and exciter field (11) to the generator. Remove shroud (10) (if equipped) and exciter field (11) from the generator.

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Illustration 8	g00620388
Retainer and Exciter Armature (13) Exciter Armature (14) Retainer (15) Bolts

7. Four bolts (15) and a retainer (14) are used to fasten the exciter armature (13) to the rotor shaft. Remove the four bolts and remove the retainer. While the retainer is being removed, carefully pass the generator leads through the retainers opening. Remove exciter armature (13) from the rotor shaft.

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Illustration 9	g00619644
Generator with Outboard PM Pilot Exciter (16) Bolt (17) Exciter Field

8. On generators with an outboard PM pilot exciter, perform the following procedure:

   1. Remove four bolts (16) which fasten exciter field (17) to the generator.

   2. Remove exciter field (17) .

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Illustration 10	g00619666
Generator with Outboard PM Pilot Exciter (18) Exciter Armature (19) Spacer

9. On generators with an outboard PM pilot exciter, perform the following procedure:

   1. Carefully slide spacer (19) off the rotor shaft.

   2. As the spacer is slid off the rotor shaft, ensure that the spacer clears the exciter leads.

   3. Remove exciter armature (18) from the rotor shaft.

Installation Procedure

Install The Exciter Field and Install The Exciter Armature

1. On generators with an outboard PM pilot exciter, perform the following procedure:
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   Illustration 11	g00619666
   Generator with Outboard PM Pilot Exciter (18) Exciter Armature (19) Spacer

   1. Slide exciter armature (18) on the rotor shaft.

   2. As the spacer is slid on the rotor shaft, ensure that the spacer clears the exciter leads.

   3. Carefully slide spacer (19) on the rotor shaft.

2. On generators with an outboard PM pilot exciter, perform the following procedure:
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   Illustration 12	g00619644

   1. Place exciter field (17) on the generator.

   2. Use four bolts (16) to fasten the exciter field to the generator.

3. Slide exciter armature (13) on the rotor shaft.

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Illustration 13	g00620388
Retainer and Exciter Armature (13) Exciter Armature (14) Retainer (15) Bolts

4. A retainer (14) is used to fasten the exciter armature (13 ) to the generator. Carefully pass the generator leads through the retainers opening.

5. Use four bolts (15) to fasten the retainer to the generator.

   Note: When the exciter armature (13) is installed, tighten bolts (15) .

   Apply 9S-3263 Thread Lock to the bolts (15) before the bolts are installed. Refer to Table 1 for information regarding bolt torque.

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   Table 1

   BOLT TORQUE
   Bolt Size	Torque
   5/16 inch	35.4 N·m (26.11 lb ft)
   3/8 inch	55.8 N·m (41.16 lb ft)

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Illustration 14	g00619613
Shroud and Exciter Field (10) Shroud (11) Exciter Field (12) Bolts

6. Use four bolts (12) to attach shroud (10) (if equipped) and exciter field (11) to the generator.

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Illustration 15	g00619603
Generator with Outboard PM Pilot Exciter (7) Bolts (8) Rotating Pilot Exciter Field (9) Stationary Pilot Exciter Armature

7. On generators with an outboard PM pilot exciter, perform the following procedure:

   1. Place stationary pilot exciter armature (9) and rotating pilot exciter field (8) on the generator.

   2. Use four bolts to attach the stationary pilot exciter armature (9) and rotating pilot exciter field (8) to the generator.

8. On generators with an outboard PM pilot exciter, perform the following procedure:
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   Illustration 16	g00619592
   Generator with Outboard PM Pilot Exciter (4) Bolts (5) Mounting Assembly (6) Retainer

   1. Slide mounting assembly (5) and retainer (6) over the rotor shaft.

   2. Use four bolts to attach the mounting assembly (5) and retainer (6) to the rotor shaft.

9. Various rectifier blocks and mounting hardware are used. The rectifier blocks and mounting plates must be installed after the exciter is attached.

End By:

1. Connect the two generator leads to the rectifier blocks.
2. Connect the three exciter leads to the rectifier blocks.
3. For permanent magnet pilot excited generators, connect wires "26", "28", and "30" to the first termination point.
4. Connect exciter wires ("F1" and "F2") to the first termination point.
5. Install the side and rear access panels to the generator.