LC5000, LC6100, and LC7000 Electric Power Generation Caterpillar

Permanent Magnet Pilot Exciter - Remove and Install - PMG

Usage:

C18 AN2

Removal Procedure

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Personal injury or death can result from high voltage.
When power generation equipment must be in operation to make tests and/or adjustments, high voltage and current are present.
Improper test equipment can fail and present a high voltage shock hazard to its user.
Make sure the testing equipment is designed for and correctly operated for high voltage and current tests being made.
When servicing or repairing electric power generation equipment:

Make sure the unit is off-line (disconnected from any utility and/or other generators that can provide power service), and either lock out or tag as "DO NOT OPERATE".

Remove all fuses.

Make sure the generator engine is stopped.

Make sure all batteries are disconnected.

Make sure all capacitors are discharged.

Failure to do so could result in personal injury or death. Make sure residual voltage in the rotor, stator and the generator is discharged.

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High voltage may be present. The power source must be disconnected before working on the equipment. Failure to disconnect the power source could result in injury or death. Verify that the equipment is not energized before performing any maintenance. This work must be performed by trained personnel with correct tools and procedures.

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Bodily contact with electrical potential can cause bodily injury or death.

To avoid the possibility of injury or death, ensure that the main power supply has been disconnected before performing any maintenance or removing any modules.

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	8T-0643	Bolts	2
B	-	Loctite 242	1

Open the AC breaker.

Disconnect the DC battery supply.

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Illustration 1	g03345043

Remove cover plate (1) .

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Illustration 2	g03345067

Remove nut (2) and washer (3) .

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Illustration 3	g03345075

Note: Permanent magnet pilot exciter (PMG) rotor (4) is permanently magnetized.

Install Tooling (A). Remove PMG rotor (4) .

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Illustration 4	g03345088

Note: Orientation of shaft extension (5) for reassembly.

Remove shaft extension (5) .

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Illustration 5	g03345093

Note: Orientation of housing (8) for reassembly.

Disconnect harness assembly (6) from the Automatic Voltage Regulator (AVR)

Remove bolts (7) and housing (8).

Installation Procedure

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Illustration 6	g03345144

Note: Inspect stud (9) for looseness and damage to the threads. When replacement or retightening are needed then apply Tooling (B) to the threads of stud (9 ) before installing into the main rotor shaft.