Topic ID: id_11039091
Version: 3.0
Date: Apr 9, 2020 8:42:51 PM

Cam Drive Motor and Flex Coupling Replacement

Prerequisites

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
3 mm, 4 mm Hex key sockets	1	-	-	-
3/32 Hex key	1	-	-	-
Phillips #2 screwdriver	1	-	-	-
Flat-blade screwdriver	1	-	-	-

Table 5. Safety

notice

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

note:

Before beginning this procedure, please read Equipment Service - Gantry, located in the Safety tab of this publication.

Procedure

Remove gantry covers as required.

Refer to Parts Replacement > Gantry > Enclosure > (Cover Removal Procedure).
Turn OFF all three (3) gantry service switches (Axial Drive, HVDC, 120 VAC).
Position the gantry with the XRT at 6 o'clock.
Remove the top cover from the Collimator by removing the five (5) pan head M4 mounting screws that have spring washers.
Remove the three red cap/plugs from the Collimator front surface (on side which motor will be removed).
Remove the driver cover on motor mount assembly by removing the two (2) pan head M4 screws with spring washers.
Disconnect the connector between motor drive and motor.
Use a flashlight aimed through the cap/plug holes to see the set screw in the coupler.
Rotate the motor until the screw is visible and can be loosened on the flexible motor coupler.
Loosen the flexible coupling hex screw.
Remove the four hex socket M4 screws holding the motor to the Motor Mount Plate.
Remove the motor from the collimator housing.
Remove the flex coupling.

note:
At this point replace the failed coupling or motor and proceed.
Install the flex coupling. Place a small drop of Loctite 242 on setscrew threads. Torque to 1.5 ± 0.15 N-m.

note:
Conversion Factor: 1 ft-lb = 1.356 N-m
Install the new motor and tighten the four hex socket screws to 3 ±0.3 N-m.
Tighten the flexible motor coupling screw. Torque to 1.5 ± 0.15 N-m.
Connect the connector between motor drive and motor.
Install the driver cover on motor mount assembly, ensuring that the two tabs engage with the slots in the filter PWB Bracket.
Tighten the two pan head M4 screws with spring washers.
Replace the top cover of the Collimator using the five pan head mounting screws with spring washers and tighten.
Install the three cap/plugs after all hardware has been torqued.

Finalization

Perform CAM A/B Motor Check procedure.