LiftMaster SW425 SW425 Manual - Page 10

I N S TA L L AT I O N PREPARATION For post mount installation, install the posts onto the operator. The posts are first inserted up into the bottom of the operator. The posts are secured by tightening U-bolt nuts from the outside (Figure 1). Figure 1 U-bolts Mounting Post For optional concrete pad mount installation, short posts are installed onto the operator and secured by tightening the U-bolt nuts from the outside. The concrete pad mounting plate is then installed onto the bottom of the posts (Figure 2). DETERMINE GATE OPERATOR LOCATION Determine the location where the operator is to be installed permanently. First close the gate and make a mark on the ground below the gate at 36" (91 cm) from the hinge. Open the gate and again make a mark on the ground at 36" (91 cm) from the hinge. A line may then be drawn though the two marks on the ground. The operator will then be placed so the shaft lies on the line (Figure 3). Place the operator in its approximate location so that the center of the shaft is located along the line that was previously drawn (Figure 4). Allow some clearance for the gate so the gate will not run into the operator during operation. Figure 2 Mounting Post U-bolt Mounting Stand Figure 3 36" (91 cm) 36" (91 cm) Gate Closed Figure 4 Imaginary Line Marks 10 Gate Open Imaginary Line