Siemens SIDOOR AT40 System Manual page 86

2. Mount the deflector unit, if necessary with a mounting bracket.
Ensure that the drive pinion and deflector pulley are aligned when doing so. They have to
be exactly aligned to ensure a long drive service life.
Door control units SIDOOR AT40 and ATD400V for elevators
System Manual, 06/2018, A5E42192709-AC
Geared motors
5.2 Installation
85