Mueller Roll-Up Door L250 - Manual (Page 6)

6 877-2-MUeLLeR
step 5: tensioneR enD
a loosely attach dual tensioner assembly to door
mounting bracket flange using the hardware provided.
B Tighten the red, square headed, 3/8 inch set screw on
the tensioner bracket.
a loosely attach axle support to door mounting bracket
flange using the hardware provided.
B Tighten the red, square headed, 3/8 inch set screw on the
support bracket.
step 6: non-tensioneR enD