﻿GET_GEVOMechL2_09_01_01_49 - ANIMATION Screen
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Brush Holder and Stud Assembly Removal 

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1. Remove all brushes from each of the assemblies.

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2. Disconnect the field cables from the bus rings at the 9 o’ clock position of the brush holder stud.

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3. Slide a 0.06 inch (1.52 mm) thick sheet of heavy paper between the brush holders and the collector rings to protect the collector ring surfaces from damage.

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4. Loosen and remove four of the eight bolts securing the brush holder yoke to the mounting block.

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5. Insert a 0.5 - 13 alignment pin into two of the four exposed bolt holes and remove the four remaining bolts.

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6. Slide the yoke with all three brush holder and stud assemblies off the alignment pins and carefully transport it to a bench.

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7. Clean and replace any components, as required.

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8. Remove the bolts and washers holding the bus rings to the brush holders of the brush holder and stud assembly to be removed.

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9. Remove the mounting bolt and washer holding the brush holder stud to the brush holder yoke.

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10. Remove the brush holder and stud assembly from the yoke.

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11. Loosen the brush holder clamp bolt and remove the brush holder clamp pad.

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12. Remove the brush holder body from the brush holder stud.

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13. Repeat, as necessary, until the faulty brush holder body has been removed.

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Brush Holder and Stud Assembly Installation

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1. Mount the brush holder bodies on the brush holder stud.

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2. Verify that the brush holder is properly oriented on the brush holder stud.

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3. Tighten the brush holder clamp bolt.

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4. Verify that the clamp pad is in place.

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5. Heat the brush holder and stud assembly to 302° F (150° C) for two hours.

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6. Cool the brush holder and stud assembly to room temperature.

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7. Re-torque the bolts.

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8. Assemble the brush holder and stud assembly to the brush holder yoke but do not tighten the mounting bolt.

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9. Ensure that the 0.06 inch (1.52 mm) thick paper is in place to protect the collector ring surfaces.

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10. Using the 0.5 - 13 alignment pins, slide the yoke with all three brush holder assemblies into position, then start six of the brush holder yoke to mounting block fixing bolts.

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11. Tighten the six fixing bolts until the yoke assembly does not move, then remove the two alignment pins and insert the two remaining fixing bolts.

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12. Torque all eight bolts.

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13. Align the new brush holder and stud assembly as discussed in the Brush Holder and Stud Assembly Alignment section of this module.

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Brush Holder and Stud Assembly Alignment 

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1. Assemble the brush holder and stud assembly to the brush holder yoke but do not tighten the mounting bolt.

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2. Place a 0.089-0.091 inch (2.2-2.3 mm) thick fiberboard shim between the brush holders and the collector rings.

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3. Slide the brush holder against the fiberboard shim and tighten the brush holder stud mounting bolt.

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4. Torque the mounting bolt.

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5. Remove the shim.

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6. Install the bus ring bolts and washers that hold the bus rings to the brush holders.

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7. Torque the bus ring bolts.

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8. Install the brushes as discussed in the Brush Installation section of this module.

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Brush Holder Cover Hose and Clamp Inspection

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Verify that the hose clamps are tight.

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If they are loose, assemble them as discussed in the Brush Holder Cover Hose and Clamp Installation section of this module.

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Verify that there are no tears or holes in the hose itself.

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If there are, replace the hose.

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Ensure that the hose is not bunched or pinched under the clamp.

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Inspect the clamps for cracks or stripped adjustors.

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Replace clamps as required.

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Brush Holder Cover Hose and Clamp Removal

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1. Using a correctly sized nut driver or a straight blade screwdriver with a heavy spade, loosen the bolt on the hose clamp until the clamp can be moved around freely.

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2. Twist the hose to break it free of the flange pipe, and remove the hose from the flange pipe.

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3. Repeat the steps with the other end of the hose.

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Brush Holder Cover Hose and Clamp Installation

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1. Position the hose onto the upper flange pipe.

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2. While holding the hose in place, tighten the clamp using a correctly sized nut driver or a straight blade screwdriver with a heavy spade.

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3. Attempt to twist the hose.

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If it moves, tighten the clamp until it is secured on both ends.


