Note: When installing the coupler and the servo motor make sure that the shaft keys  are in place during the process. It is possible for the key to fall out during installation. Missing key will result in positioning accuracy errors.
Make sure to insert the flex coupler installation tool  between the coupler halves to protect the flex plates during the installation and set the correct gap between the halves. Refer to the Ballscrew - Installation Tools and Torque Specifications.
Slide the coupler onto the motor shaft until the face of the coupling half is flush with the end of the motor shaft and torque the clamping bolt .
Note: The slot on the locking collar must be positioned at 45° to the bolt pattern . If improperly aligned, the coupler will not have equal clamping force around the shaft.
Install the motor and torque the mounting bolts .
Torque the collar clamping bolt .
Remove the flex coupler installation tool .
Install the coupler access cover.