30SI Series and 34SI Series Alternator Caterpillar

Assembly Procedure

Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned in cleaning fluid. Allow the parts to air dry. Wiping cloths or rags should not be used to dry parts. Lint may be deposited on the parts which may cause later trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement.

Procedure for the 34-SI

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Illustration 1	g00651391
Typical Example

1. Press collar (31) on rotor (28) .

2. Slide retainer (30) on rotor (28) .

3. Press bearing (29) on rotor (28) .

4. Press housing (22) on rotor (28) and bearing (29) .

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Illustration 2	g00651367
Typical Example

5. Install 4 screws (27) in housing (22) .

Note: Do not strike the bearing. Shocks from striking the housing can cause damage.

6. Install the inner race. Press the bearing into the housing.

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Illustration 3	g00651219

7. Press cap (26) in housing (20). Install the coil and support (24) in housing (20). Guide the field leads through the hole as the coil is installed in the housing. Install 4 screws (25) .

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Illustration 4	g00651365
Typical Example

8. Press stator (23) and housing (20) together. Guide the stator leads through the hole as the stator is installed in housing (20) .

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Illustration 5	g00651362
Typical Example

Note: Do not damage exposed stator windings or field windings. Bumping the windings or scraping the windings may break the insulation. Broken insulation may create a short circuit or a ground.

Note: Some models have a fourth mounting lug.

9. Join housing (22) and housing (20). Install 4 bolts (21).

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Illustration 6	g00651213

10. Install rectifier bridge (19) .

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Illustration 7	g00651211

11. Install capacitor (18). Install two screws (17).

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Illustration 8	g00651204

12. Install regulator (16). Install screw (15).

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Illustration 9	g00651197

13. Connect the insulated ground lead (14). Connect lead (13). Install nut (12) .

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Illustration 10	g00651167

14. Install 2 insulated screws (11) .

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Illustration 11	g00651162

15. Install diode trio (10) .

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Illustration 12	g00651157

16. Connect 3 leads (9). Install "R" terminal strap (8). Install 3 screws (7) .

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Illustration 13	g00651154

17. Install the "I" terminal strap (6). Connect 2 leads (5). Install 2 insulated screws (4) .

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Illustration 14	g00651151

18. Install 4 terminal studs (3) .

    Note: Not all of the alternators will have 4 terminals.

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Illustration 15	g00651141

19. Position plate (2). Install 4 screws (1) .

20. Install the fan, the pulley, the washer, and the pulley nut.

Procedure for the 30-SI

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Illustration 16	g00651391
Typical Example

1. Press collar (31) on rotor (28) .

2. Slide retainer (30) on rotor (28) .

3. Press bearing (29) on rotor (28) .

4. Press housing (22) on rotor (28) and bearing (29) .

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Illustration 17	g00651367
Typical Example

5. Install 4 screws (27) in housing (22) .

Note: Do not strike the bearing. Shocks from striking the housing can cause damage.

6. Install the inner race. Press the bearing into the housing.

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Illustration 18	g00651235

7. Press cap (26) in housing (20). Install the coil and support (24) in housing (20). Guide the field leads through the hole as the coil is installed in the housing. Install 4 screws (25) .

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Illustration 19	g00651365
Typical Example

8. Press stator (23) and housing (20) together. Guide the stator leads through the hole as the stator is installed in housing (20) .

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Illustration 20	g00651362
Typical Example

Note: Do not damage exposed stator windings or field windings. Bumping the windings or scraping the windings may break the insulation. Broken insulation may create a short circuit or a ground.

Note: Some models have a fourth mounting lug.

9. Join housing (22) and housing (20). Install 4 bolts (21).

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Illustration 21	g00651234

10. Install capacitor (34). Install screw (33) .

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Illustration 22	g00651233

11. Install rectifier bridge (32). Install 2 screws (19) .

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Illustration 23	g00651232

12. Slide terminal strap (17) in the housing. Install nut (16). Install screw (18).

13. Install diode trio (15). Install strap (12) .

14. Connect 3 leads (14). Install 3 nuts (13) .

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Illustration 24	g00651228

15. Install terminal (11) .

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Illustration 25	g00651227

16. Install regulator (10). Install screw (9) .

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Illustration 26	g00651226

17. Install strap (7). Connect leads (5). Install nut (6). Install screw (8) .

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Illustration 27	g00651225

18. Connect 2 leads (4). Install 2 insulated screws (3).

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Illustration 28	g00651125

19. Position plate (2). Install 4 screws (1) .

20. Install the fan, the pulley, the washer, and the pulley nut.