
11
1/2 HP Chain Drive Garage Door Opener
8.
Adj ust the chain tension
by turning the outer nut with a 13mm wrench until the chain is ½ inch away from
the bottom of the rail at the midpoint of the rail. C
aution:
Use a second wrench to hold the chain from
twisting during assembly.
9. While holding the outer nut in position, tighten the inner nut securely to hold the proper chain tension.
Inner Nut