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F820 Front /Back Motor R&R
Tools required: 7/16” wrench, 7/64” Allen wrench, 3/16” nut driver (MK) phillips
screwdriver (IG), wire cutters.
Removal –
(see fig 2)
1) Move robot towards the front and center of the machine. The front / back motor
is the second one from the front of the robot, just behind the up / down motor.
2) Remove three ¼” screws from left side of front robot cover. If applicable,
remove one ¼” screw from the right side.
3) Remove two ¼” screws from the metal access plate on the left side of robot to
access the motor.
4) Cut tie wrap holding ribbon cable to motor, and disconnect the ribbon cable.
5) Remove the white gear by unscrewing the 7/64” allen screw holding it to the
shaft. If the gear doesn’t easily come off after removing the screw, gently pry it.
6) Remove the three 3/16”(phillips) screws holding the motor in place.
Reinstallation
1) Put new motor in place and line up all three screw holes.
2) Install the three 3/16”(phillips) screws, but don’t tighten them yet.
3) Place the white gear on the motor shaft.
4) Slide the motor up until the gears are tight and then back off ½ mm. Tighten the
one 3/16” screw that is accessible with the white gear on. Ideal gear mesh will
allow a piece of paper to pass through the gears, wrinkling it, but not ripping or
puncturing it. Manually move the robot front to back the full length of the track to
ensure there is no binding or skipping of the new mesh adjustment.
5) Remove the white gear and tighten the remaining two 3/16” screws.
6) Place the white gear on the motor shaft and secure it with the 7/64” allen screw.
7) Plug in the ribbon cable and tie wrap it to the motor.
8) Reinstall both robot covers.
Figure 2 – IG Motor (MK mounts the same)
Mounting screws
Allen Screw
Motor Gear
