ETS-Lindgren 2071B Antenna Positioning Tower (Archived) - Manual (Page 36)

36 | Assembly Instructions
21. To install the fiber optic limit switch:
 With the carrier at 1 meter, clamp the fiber optic limit switch
assembly to the mast.

Slide the fiber optic limit switch to the 1 meter position.
22. Carefully move the belt tension idler into place against the drive belt and re-install the spring if it was removed. The tension idler should be free
on its pivot and the spring should force it against the belt.
23. With the proper belt tension and with no load on the boom, the idler should be stopped at approximately 30 mm (1.2 in) from reaching the end of
travel against the motor pulley.
If the idler is against the pulley, retighten the belt to prevent slack when loads are applied to the boom. As the boom is loaded the tension idler
needs to move closer and take up the slack as the mast deflects under load.
Archived 06/24/14