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14. Remove the z-motor timing pulley from the z-motor.
15. Remove the z-motor mounting bracket from the z-motor, install it on the replacement motor, and
tighten the screws to the torque specications.
•
CAUTION!! Do not drop the z-motor timing pulley or allow the star washers that are pressed
inside the bore to come loose. If the star washers fall out or come loose, the timing pulley must
be replaced. If you install a timing pulley with the star washers loose or missing, damage to the
machine will likely result.
16. Install the z-motor timing pulley onto the z-motor shaft and tighten the screw to 8 in-lbs[0.9 Nm].
This must be done with a reliable torque wrench.
17. Mount the motor assembly to the upper arm as shown in Figure 4 above and tighten the screws
to The torque specications.
18. Use a cable tie and tie the z-motor harness to the adjacent harness leads at the z-motor mount
standoff (x-harness leads and the Control Board LED lead).
19. Attach the cable clamp to the z-motor lead (marked “CONTROL PCB Z MOTOR”) and attach the
cable clamp at the bottom of the z-motor mounting bracket as shown in Figure 4. Tighten the
screw to The torque specications.
20. Use a cable tie and tie the z-motor harness leads and the adjacent leads together right before the
clamp.
21. Tie the z-motor harness to the adjacent harnesses at about every 3 inches and route the z-motor
harness leads down the back of the machine to the cable access hole. Connect the motor harness
and hall/encoder leads to the main PCB.
22. Tension the z-drive belt as specied in Z-Belt Replacement and Tensioning.
23. Unless you have additional work to do on the inside of the machine, install the covers back onto
the machine in the reverse order you removed them.
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