IAI America RCA2-TW4N - Manual (Page 121)

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13. Maintenance and Inspection
[3] Remove the belt from the pulleys. When replacing the belt, proceed to step [7].
[4] Remove the tension adjustment bolts and pull out the motor unit.
[5] Install the replacement motor unit.
As shown below, install the motor unit so that its specified surface faces the actuator base.
Use the tension adjustment bolts to loosely secure the motor unit.
Install the motor unit by making sure the
base surface of the actuator faces the
motor unit surface having two holes.
The surface with no gaps must
face the motor unit surface
having two holes.