IAI America RCS3PCR-SS8C - Manual (Page 212)

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11. Maintenance and Inspection
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9) Detach the attached cables.
Use an Allen wench of 2.5 mm across flats to disconnect the ground wire.
10) Use an Allen wench of 2.5 mm across flats to loosen the coupling screws on the ball screw end.
11) Use an Allen wench of 3.0 mm across flats to remove the motor screws.