﻿GET_GEVOMechL2_08_01_01_90 - ANIMATION Screen
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Summarize the major steps to disassemble and assemble an AC traction motor combo.

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Gear Case Disassembly

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1. Drain the lubricant from the gear case by removing the drain plug located on the lower side of the gear case bottom half.

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2. Remove the 16 gear case split line bolts and washers and the two gear case mounting bolts.

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3. Attach a lifting cable through the inverted "U-shaped" holes in each end of the upper gear case, and take up the slack in the cables with a hoist or crane.

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4. With an overhead crane, lift off the upper gear case, guiding the center bolt pad, located between the axle and pinion bores, through the relief in the traction motor framehead.

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5. Pry the lower gear case loose from the gutter on one end and the pinion bore seal on the other end.

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6. Attach axle slings.

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Use a lifting cable at the motor lifting eye and raise the motor, wheels, and axle assembly to approximately one foot.

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7. Remove and discard the gutters and the pinion bore seal.

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8. Carefully position the motor on the nose support.

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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 eight bolts and washers that hold the U-tube to the traction motor frame.

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3. Attach a lifting strap to each axle journal bearing, then use jacking bolts, if necessary, to separate the assembly from the traction motor frame.

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4. Using a crane or hoist, lift the assembly off the motor.

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5. Thoroughly clean the U-tube, wheels, gear, and axle assembly of grease and dirt.

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6. 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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7. Install guide pins in the bearing cap before removing all the bolts.

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8. Remove the pinion end bearing cap from the traction motor.

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9. Inspect the bearing as follows:

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a. Verify that the cage is not rubbing the inner ring flange.

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b. Rotate the bearing by hand, listening for noise and feeling for roughness.

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c. Inspect for metal debris from the bearing rollers, or any other visible defects.

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If any debris or defect is found, replace the bearing.

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d. Verify bearing clearance with a feeler gauge.

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It should be 0.012 to 0.016 inches (0.3048 to 0.4064 mm).

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10. If no bearing defects are found, flush the bearings with HD 57 oil.

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11. Inspect the oil metering hole and trough screen for debris.

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Flush the trough until no debris washes out.

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12. Clean the bearing cap, apply a new gasket, and return the bearing cap to the traction motor.

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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 excess solvent.

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2. Clean the mating surface and apply a gasket (Part Number 41A239176P317) at the pinion end (PE) of the traction motor, where the U-tube and the motor frame join.

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3. Clean the mating surface and apply a gasket (Part Number 41A239176P317) at the connection end (CE) of the traction motor, where the U-tube and the motor frame join.

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4. Clean the pinion end bearing cap groove with CRC Natural Degreaser.

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5. Install the pinion bore seal into the bearing cap groove as follows:

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a. Start at the top and work the seal into the groove towards the bottom.

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b. Seat the seal by tapping with a rubber mallet.

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c. Place the Seating Ring Tool (84A206903P1) over the gasket and rotate it around the gasket.

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6. Lift the U-tube, wheels, gear, and axle assembly with a crane or hoist, and rotate the assembly so that the U-tube mounting surface faces downwards.

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Line up the mounting holes.

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7. Lower the assembly onto the traction motor frame.

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8. Verify that the gear and the pinion are properly aligned and that the teeth are engaged.

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9. 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 MOLYKOTE<sup>®</sup> D-321 R lubricant (Part Number 41A219134P9).

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10. Start the eight mounting bolts by hand and then evenly torque the bolts to the proper torque value.

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11. Install plastic plugs (Part Number 41A235989P5) in both U-tube jacking bolt holes.
