SCJ and 8SC Series Alternators Caterpillar

Disassembly Procedure

Start By:

1. Remove the alternator. Refer to Disassembly and Assembly, "Alternator - Remove" for the machine that is being serviced.

Note: Cleanliness is an important factor. Before the disassembly procedure, the exterior of the component should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.

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Illustration 1	g01058845

1. Remove the pulley nut, the washer, the pulley (with a suitable puller), key, fan and spacer from the alternator.

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Illustration 2	g01058854

2. Remove 3 screws (1) from rear debris cover (2), then remove cover.

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Illustration 3	g01058878

3. Remove the four regulator screws (3) and pull regulator away from the alternator far enough to see the internal wire connections.

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Illustration 4	g01058887

4. Mark all wires for correct assembly. Disconnect wires and remove regulator.

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Illustration 5	g01059874

5. Remove the two bolts (4), brush assembly cover and gasket (5) .

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Illustration 6	g01066265

6. Disconnect the two wires (6) from the brush assembly. Remove the two bolts (7) and brush assembly (8) from the cavity.

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Illustration 7	g01059882

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Illustration 8	g01059884

7. Mark the alternator housings and stator for correct assembly. Remove the four housing bolts (9) and separate the front housing and rotor assembly (10) from the rear housing and stator assembly (11) .

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Illustration 9	g01059919

8. Remove the three bolts (12) from the front housing. Reinstall the pulley nut and tap the rotor shaft against a wood block to separate the front housing from the front bearing.

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Illustration 10	g01059927
Removing seal from front housing

9. Remove seal from the front housing if necessary.

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Illustration 11	g01059928

10. Remove front bearing (13) (with a suitable puller), bearing retainer (14) and felt seal (15) from the rotor assembly if necessary.

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Illustration 12	g01059946

11. Remove the three nuts (16) from the stator winding leads. Remove the stator from the rear housing.

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Illustration 13	g01066803

12. Mark all wires for correct assembly. Remove 2 bolts (17) from diode assemblies and disconnect wires.

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Illustration 14	g01066814

13. Remove nuts (18) and washers (19) from diode assembly mounting bolts and carefully remove rear housing from the diode assemblies.

14. Remove the insulated washers and plastic sleeves from the diode assembly mounting bolts.

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Illustration 15	g01066824

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NOTICE
Failure to use long nose pliers as a heat sink can cause damage to the diodes because of too much heat during lead unsoldering.

15. Mark all wires for proper assembly. Using a pair of long nose pliers as a heat sink, unsolder stator leads (20) from diode assemblies (21).

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Illustration 16	g01066822

16. If required, remove snap ring (22) and seal (23) from rear housing. Then remove bearing (24) from rear housing with a suitable puller.