IAI America RCS2-RTC12L - Manual (Page 48)

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10. Maintenance/Inspection
(2) How to add grease
[1] Remove the screws mounting the rear cover (countersunk machine screw M2.6 x 6).
Pull the rear cover slightly from the actuator frame. (Do not forcibly pull the cables inside.)
[2] While turning the gears, apply grease from the rear opening just enough to coat the bottom of the
teeth. (As the input shaft is turned, the output gears turn.)
Thereafter, turn the grease several times in both directions to let the grease spread evenly.
Round terminal
Turn.
If the actuator has a brake,
connect the controller to
release the brake.
You should see the gears through
this opening.
Apply grease on the tooth surface.