SR4 Generator with VR3 or VR4 Voltage Regulator Caterpillar


Rotor - Remove and Install

Usage:

3306B 1DG

Removal Procedure

Start By:

  1. Remove the generator. Refer to Disassembly and Assembly, "Generator - Remove".
  2. Remove the exciter field and remove the exciter armature. Refer to Disassembly and Assembly, "Exciter - Remove and Install".



    Illustration 1g00615990

    (1) Bolts

    (2) Coupling Plate

  1. Remove bolts (1) which fasten coupling plate (2) to the rotor. Remove the coupling plate. The coupling plate assembly can be a single solid plate or the coupling plate assembly can be numerous flexible plates.



    Illustration 2g00615994

    (3) Shims

    (4) Fan

  1. Remove shims (3) from the rotor shaft. Remove fan (4) from the generator housing.

  1. Attach straps or chains to the drive end of the generator housing. With a hoist, raise the generator until the generator is in a vertical position. Ensure that the drive end is oriented upward.

  1. Align support blocks with the generator housing's outside diameter. Lower the generator onto the blocks.

  1. The generator bearing is located on the exciter end of the rotor shaft. The bearing is retained in the generator end housing by a bearing cap or the bearing is retained in the generator end housing by retainer bars.

    When the generator end housing is equipped with retaining bars, remove the four bolts that fasten the retaining bars to the generator end housing. Remove the retaining bars.

    When the generator end housing is equipped with a bearing cap, remove the necessary bolts that fasten the bearing cap to the generator end housing. Pry the bearing cap out of the generator end housing. The bearing cap remains with the rotor shaft. If a bearing lube line is attached to the bearing cap, remove the lube line.




    Illustration 3g00624626

    (5) Bolts

  1. On 3406E generator sets, the drive end housing must be removed. Attach a hoist to the drive end housing. Remove the bolts (5) that attach the drive end housing to the generator. Remove the drive end housing.



    Illustration 4g00616086

    (6) Bolts

    (7) Drive End Housing

  1. For two-bearing generators, bolts (6) which fasten drive end housing (7) to the generator must be removed. The drive end housing remains with the rotor shaft. Remove the bolts.

    For two-bearing generators, put a mark on drive end housing (7) and the generator housing. This will ensure proper alignment during installation.




    Illustration 5g00616101

    (8) Protective Strip

    (9) Drive Coupling


    NOTICE

    During removal of the generator, the rotor assembly must not contact the stator assembly. If the rotor assembly contacts the stator assembly, the windings can be damaged.


  1. Put protective strips (8) of cardboard, plastic or curved sheet metal between the rotor assembly and the stator assembly. The pieces should be as long as the rotor assembly. These pieces protect the rotor and the stator from damage during rotor removal.

  1. Attach a hoist to drive coupling (8). Remove the rotor assembly from the stator assembly.

Installation Procedure

Start By:

  1. Place the generator in a vertical position. Ensure that the drive end is oriented upward.



    Illustration 6g00616101

    (8) Protective Strip

    (9) Drive Coupling

  1. Put protective strips (8) of cardboard, plastic or curved sheet metal between the rotor assembly and the stator assembly. The pieces should be as long as the rotor assembly. During installation of the rotor, these pieces protect the rotor from damage. These pieces also protect the stator from damage.

  1. Attach a hoist to drive coupling (9). Lower the rotor assembly into the stator assembly.

  1. For two-bearing generators, the drive end housing is attached to the rotor shaft. When the rotor was removed from the generator, an alignment mark was made on the drive end housing and the generator housing. Align these marks. Start the bolts that attach the drive end housing to the generator. Do not tighten the bolts.

  1. There is a generator bearing on the exciter end of the rotor shaft. This bearing is retained in the generator end housing. The bearing is retained in the generator end housing by a bearing cap or the bearing is retained in the generator end housing by retaining bars.

    When the generator end housing is equipped with retaining bars, install the four bolts that fasten the retaining bars to the generator end housing.

    When the generator end housing is equipped with a bearing cap, install the necessary bolts that fasten the bearing cap to the generator end housing. If a bearing lube line is attached to the bearing cap, install the lube line.




    Illustration 7g00616086

    (6) Bolts

    (7) Drive End Housing

  1. On a two-bearing generator, tighten the bolts (6) that attach the drive end housing (7) to the generator.



    Illustration 8g00624626

    (5) Bolts

  1. On a 3406E generator set, install the drive end housing. Tighten bolts (5) .



    Illustration 9g00615994

    (3) Shims

    (4) Fan

  1. Place fan (4) in the drive end housing.

  1. Install shims (3) on the rotor shaft.



    Illustration 10g00615990

    (1) Bolts

    (2) Coupling Plate

  1. Install coupling plate (2) on the rotor. Tighten bolts (1) .

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