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30SI Series and 34SI Series Alternator Caterpillar


Alternator - Disassemble

Usage:

769C 01X

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.

Procedure for the 34-SI

  1. Remove the pulley nut, the washer, the pulley, and the fan.
    Show/hide table

    Illustration 1g00651141

  1. Remove 4 screws (1). Remove plate (2) .
    Show/hide table

    Illustration 2g00651151

  1. Remove 4 terminal studs (3) .

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

    Show/hide table

    Illustration 3g00651154

  1. Remove 2 insulated screws (4). Remove 2 leads (5). Remove the "I" terminal strap (6) .
    Show/hide table

    Illustration 4g00651157

  1. Remove 3 screws (7). Remove "R" terminal strap (8). Remove 3 leads (9).
    Show/hide table

    Illustration 5g00651162

  1. Remove diode trio (10) .
    Show/hide table

    Illustration 6g00651167

  1. Remove 2 insulated screws (11) .
    Show/hide table

    Illustration 7g00651197

  1. Remove nut (12). Remove lead (13). Remove the insulated ground lead (14) .
    Show/hide table

    Illustration 8g00651204

  1. Remove screw (15). Remove regulator (16) .
    Show/hide table

    Illustration 9g00651211

  1. Remove two screws (17). Remove capacitor (18) .
    Show/hide table

    Illustration 10g00651213

  1. Remove rectifier bridge (19) .
    Show/hide table

    Illustration 11g00651362

    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.

  1. Remove 4 bolts (21). Carefully separate housing (22) from housing (20) .
    Show/hide table

    Illustration 12g00651365

    Typical Example

  1. Pull apart stator (23) and housing (20). Guide the stator leads and the grommet through the hole as the stator is removed from housing (20) .
    Show/hide table

    Illustration 13g00651219

  1. Remove 4 screws (25). Remove the coil and support (24) from housing (20). Guide the field leads through the hole as the coil is removed from the housing. Pry cap (26) from housing (20). This will expose the bearing for the rotor.

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

  1. Wipe the excess grease from the bearing well. Press the bearing into the housing. Remove the inner race.
    Show/hide table

    Illustration 14g00651367

    Typical Example

  1. Remove 4 screws (27) from housing (22) .
    Show/hide table

    Illustration 15g00651391

    Typical Example

  1. Lift rotor (28) and bearing (29) from housing (22) .

  1. Pull bearing (29) from rotor (28) .

  1. Pull retainer (30) from rotor (28) .

  1. Pull collar (31) from rotor (28) .

Procedure for the 30-SI

  1. Remove the pulley nut, the washer, the pulley, and the fan.
    Show/hide table

    Illustration 16g00651125

  1. Remove 4 screws (1). Remove plate (2) .
    Show/hide table

    Illustration 17g00651225

  1. Remove 2 insulated screws (3). Remove 2 leads (4) .
    Show/hide table

    Illustration 18g00651226

  1. Remove screw (8). Remove nut (6). Remove leads (5). Remove strap (7).
    Show/hide table

    Illustration 19g00651227

  1. Remove screw (9). Remove regulator (10) .
    Show/hide table

    Illustration 20g00651228

  1. Remove terminal (11) .

  1. Remove 3 nuts (13). Remove 3 leads (14) .

  1. Remove strap (12). Remove diode trio (15) .
    Show/hide table

    Illustration 21g00651232

  1. Remove screw (18). Remove nut (16) and slide terminal strap (17) out of the housing.
    Show/hide table

    Illustration 22g00651233

  1. Remove 2 screws (19). Remove rectifier bridge (32) .
    Show/hide table

    Illustration 23g00651234

  1. Remove screw (33). Remove capacitor (34) .
    Show/hide table

    Illustration 24g00651362

    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.

  1. Remove 4 bolts (21). Carefully separate housing (22) from housing (20) .
    Show/hide table

    Illustration 25g00651365

    Typical Example

  1. Pull apart stator (23) and housing (20). Guide the stator leads through the hole as the stator is removed from housing (20) .
    Show/hide table

    Illustration 26g00651235

  1. Remove 4 screws (25). Remove the coil and support (24) from housing (20). Guide the field leads through the hole as the coil is removed from the housing. Pry cap (26) from housing (20). This will expose the bearing for the rotor.

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

  1. Wipe the excess grease from the bearing well. Press the bearing into the housing. Remove the inner race.
    Show/hide table

    Illustration 27g00651367

    Typical Example

  1. Remove 4 screws (27) from housing (22) .
    Show/hide table

    Illustration 28g00651391

    Typical Example

  1. Lift rotor (28) and bearing (29) from housing (22) .

  1. Pull bearing (29) from rotor (28) .

  1. Pull retainer (30) from rotor (28) .

  1. Pull collar (31) from rotor (28) .

Caterpillar Information System:

30SI Series and 34SI Series Alternator Component - Test
30SI Series and 34SI Series Alternator Component Description
30SI Series and 34SI Series Alternator Initial Troubleshooting Procedure
30SI Series and 34SI Series Alternator General Information
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