Tan motor for cordless blind. You should replace the trans and all motors. I find cordless shade parts difficult to replace. I have damaged more that one replacement part, when repair one shade. No returns or refunds on all cordless shade parts.
It's best to replace all the motors and the trans. Lower the shade down. Remove trans with the motor.
If only removing some parts, lower the shade down. Remove trans with the motor. Be sure the motor is locked, so not to lose the tension. Replace damaged parts and reinstall. Remove the lock from the motor and remove the pins from the trans and and the shade should work. If you can not lower the shade. Remove the trans and motor untwist the cords. Replace damaged parts. When replacing all the parts the shade needs to be lowered. Attach trans to motor or motors. Install the unit, then remove the locks on the trans or motors.