Lay the new belt beside the rail.
Grasp the end of the belt that has the trolley connector hook and pass approximately 12 inches of the belt through the rail window.
Add general-purpose grease to the idler pulley center hole if it's dry.
Insert the idler pulley into the rail window behind the belt and line up the mounting hole.
Reinstall the idler pulley bolt and tighten it firmly with the lock washer and nut.
Make sure the idler pulley spins freely after tightening the nut.
Hook the new belt trolley connector to the trolley retaining slot.
Route the belt onto the idler pulley and align the remainder of the belt along the rail routing the belt around the motor pulley, making sure not to twist the belt.
Position the trolley threaded shaft next to the loose end of the belt with the flat end of the threaded shaft facing the smooth side of the belt.
Connect the trolley threaded shaft to the new belt by pushing the pins of the master link bar up through the threaded shaft mounting hole and the fitting of the new belt.
Push the master link cap over the master link bar pins and past the pin notches.
Slide the clip-on spring over the master link cap and onto the pin notches until both pins securely lock in place.
Making sure not to twist the belt, insert the trolley threaded shaft through the hole in the trolley.
While holding the belt stationary at the trolley threaded shaft, insert the nut ring and tension spring on the trolley shaft.
Thread the trolley spring nut onto the trolley threaded shaft and tighten the spring nut until it's flush with the end of the threaded shaft.
Reinstall the belt cap on top of the pulley.