﻿GET_GEVOMechL2_08_01_01_92 - ANIMATION Screen
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Summarize the major steps to disassemble and assemble a DC traction motor combo.

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Gear Case Disassembly

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1. Drain the gear case lubricant into a suitable container.

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2. With the motor and axle assembly in the normal horizontal position, remove the eight split line bolts holding the top half of the gear case to the bottom half.

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3. Lift off the top half of the gear case with a crane.

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4. Remove the three gear case mounting bolts and washers or washer assemblies that secure the bottom half to the traction motor frame and drop the gear case to the floor.

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5. If equipped, discard any Nord Lock or 4-component load washers.

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6. Move the gear case to a suitable area.

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7. Carefully inspect the gear case mounting and split line bolts and replace or return to service depending on the following inspection criteria:

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a. The bolt visually appears bent.

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Check for a bent bolt by laying it on a flat surface and rolling the bolt.

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b. The threads are damaged to the point that the bolt cannot be installed by hand.

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c. The bolts have visible cracks or deformation in shank and threads or underhead radius.

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Light surface rust is acceptable, but no corrosion pitting is acceptable in the shank, underhead radius, and threads.

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d. The bolts are corroded to the extent that corrosion cannot be removed with a rag and solvent (such as brake cleaner or alcohol).

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8. Thoroughly cleanse the gear case split line bolts that can be reused.

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9. Clean hardened washers to remove all dirt and oil and return to service.

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10. Attach a nylon lifting strap to each axle journal bearing.

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11. Lift the motor, wheels, and axle assembly and rotate it 90°.

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12. Position the motor nose on wooden blocks.

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13. Remove the motor-side and wheel-side axle bore seals (gutters) from the axle.

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U-tube, Wheels, and Axle Assembly Removal

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1. Remove the gear case.

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2. Remove the two bolts, plate, and cable cleat holding the traction motor cables to the U-tube.

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3. Remove the eight bolts that hold the U-tube to the traction motor frame.

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4. If equipped, remove the two 5/8-inch bolts (or drain hole plugs) from the middle of the U-tube.

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5. Attach lifting cables around both ends of the wheels, gear, axle, and U-tube assembly.

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6. Use jacking bolts, if necessary, to separate the U-tube assembly from the traction motor frame.

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7. Using a crane or hoist, lift the wheels, gear, axle, and U-tube assembly clear of the traction motor.

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8. Thoroughly clean the U-tube, gear, wheels, and axle assembly to remove grease and dirt.

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9. After cleaning, apply rust prohibitive to all machined surfaces except the wheels, then cover the assembly in plastic and tape shut until needed.

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U-tube, Wheels, and Axle Assembly Installation

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1. Clean the traction motor frame and U-tube mounting surfaces with a rag dipped in an approved solvent, then wipe the mounting surfaces with a clean rag to remove any excess solvent.

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2. Apply a gasket (Part Number 41A239176P317) to the commutator end of the traction motor frame where the U-tube mounts to the frame and trim the gasket to fit.

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3. Apply another gasket (Part Number 41A239176P317) to the pinion end of the traction motor frame where the U-tube mounts to the frame and trim the gasket to fit.

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4. Lift the U-tube, wheels, gear, and axle assembly with a crane or hoist; rotate the assembly so that the U-tube mounting surface is facing downward.

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5. Line up the mounting holes and lower the assembly onto the traction motor.

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6. Verify that the two gears are properly aligned and that the teeth are engaged.

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7. Lubricate the threads of the eight U-tube-to-motor mounting bolts and under the bolt heads and both faces of the associated washers with a Wabtec approved Moly-based lubricant (84B565364A1) and wait until dry to touch (approximately 5 minutes) before assembly.

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8. Start the eight mounting bolts by hand and then torque the bolts to 1325 ± 75 lb.-ft. (1797 ± 102 Nm).

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9. Install the two 5/8-inch bolts into the U-tube drain holes.