Axial Drive Motor Assembly Replacement

Prerequisites

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
Standard FE Tool Kit	1	-	-	-
Torque Wrench	1	-	-	-
Motor Lift Tool	1	-	-	-
Flexible lifting straps	2	-	-	-
Installation Support Kit	1	-	-	-

Table 5. Safety

Electrocution hazard
High Voltages present.
Use proper lockout/tagout procedures before replacing components. See safety menu of Service Document gui for appropriate procedures.

Follow ALL required safety and PPE procedures customary for your organization when working on this product.

note:

Some steps may require service in blind areas.

Table 6. Required conditions
Condition	Reference	Effectivity
Only trained service personnel should service the GE CT Scanner.	-	-
Gantry rotated to a position that offers the best service access, before turning off gantry 120/ 208 VAC.	-	-

Overview

Remove gantry covers as required.

Refer to Parts Replacement > Gantry > Enclosure > (Cover Removal Procedure).
Remove the Lower slipring cover.
Remove the tilting gantry bottom cover.

Electrocution hazard
High Voltages present.
Use proper lockout/tagout procedures before replacing components. See safety menu of Service Document gui for appropriate procedures.

Turn off all 3 switches (Axial Drive, HVDC, 120VAC). Remove all system power at the Main Disconnect panel and use proper Lockout/Tagout procedures.
Rotate the tube to the 3:00 position.
Disconnect the Control and Dynamic Brake cabling at the Axial Drive Module.

Refer to Axial Drive Module Replacement, for details.
Remove the Drive Gear cover.
Using a 6mm hex key, or hex bit socket, and a 12 inch extension, fully loosen the elongated hex screw to loosen the drive belt.

Figure 1. To loosen drive belt, loosen 2 screws and the long hex screw
Remove the drive belt from the drive gear. Take care to not disturb the teeth engagement along the rotating assembly.
Using a 10mm hex key, or hex bit socket, loosen two (2) screws that will loosen drive belt.

severe injury possible.
if the hoist hook's lock nut is loose, then the motor might drop from the hoist, with the resulting in serious injury to service personnel.
before using the hoist, check to make certain that the hook's lock nut is not loose. If it is loose, do not use the hoist. instead, order a new hoist.

Heavy Object
Motor assembly is in an awkward location while removing/installing. Motor assembly can shift when removing mounting hardware.
Make sure the motor is supported with a hoist.

Loosen four (4) hex screws, using a hex bit socket, to release motor and remove ground cable.

Figure 2. Removing the four (4) hex screws will release motor

Heavy Object.
Motor is Heavy.
Exercise Care, When Replacing the Motor. Make Certain to Support the Motor with a Hoist.

Replace motor and secure it in place. If the 6mm bolts that were removed have Loctite on them, clean the bolts and reapply Loctite 242. For all others, set the torque on the four hex bolts to the following value.

55 Nm 555 kg-cm 40 ft-lbs 480 in-lbs
Install the drive belt on the drive gear and tension belt.

For details, refer to Belt Removal and Installation.
Connect cabling to Axial Drive module. Reference Axial Drive Module Replacement.
Reassemble gantry.