GRAPHTEC FC 4500 Series Service Manual page 54

(8) Remove the two M3L8 TP head screw holding the Y Motor, and then detach the Y Motor.
(9) Loosen the two M4L4 set screws holding the X Motor Pulley, and then detach the X Motor Pulley
from the X Motor.
M4L4 set screw
How to install the X Motor
(1) Reattach the X Motor in the reverse order in which it was detached.
(2) Position the pulley surface and the motor shaft surface to be flat.
FC4500-UM-251-9370
M3L8 TP head screw
X Motor Pulley
X Motor Pulley
Position the motor pulley to be flat to this side
of motor shaft.
X Motor
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6 REPLACEMENT PROCEDURES