LiftMaster SW470 SW490 GL BOARD Manual - Page 13

I N S TA L L AT I O N CONTROL ARM ASSEMBLY (SW490) 1. Set the control arm's close stop on the operator so that its position corresponds with the handling of the installation (Figure 1). 2. Remove the open stop, as it is not to be used in this application. Use any existing hardware necessary to seal the open stop's hole in the operator's cover. 3. Measure the length of the gate panel and select the appropriate extension arm (x) and control arm (Y) dimensions from the gate installation table. 4. Install the control arm hub assembly to the operator's output shaft. Make sure that the key is properly inserted into the hub assemblies keyway. Lock the key in place with using the set screw provided in the hub. 5. Attach control arm extension to control arm hub assembly by bolting or welding the two pieces together to achieve the proper control arm dimension (Y). 6. Determine the proper location of the gate bracket by measuring the gate panel's length and referring to the gate installation table (Dimension B) on the next page. Install the supplied gate bracket or install your own gate bracket (recommended 2" x 2" x 1/4" angle) horizontally on the gate and at the same height as the top surface of the control arm extension. Secure the gate bracket to the gate by either welding or bolting the bracket to the gate. 7. Assemble one extension arm holder to the gate bracket using supplied hardware (Figure 2). 8. Assemble the other extension arm holder to the control arm extension using the supplied pivot pin assembly and cotter pin (Figure 3). 9. Measure and cut pipe (not provided) and position the pipe into the extension arm holders to achieve the proper extension arm dimension (X). Insert the hex head set screws in each extension arm holder in order to hold pipe firmly. Do not tighten until testing and all final adjustment have been completed (Figure 4). Figure 1 Close Stops Left hand installation Right hand installation SW490 Parallel to Fence Figure 2 3/4"-10 x 3 Hex Head Bolt 3/4" Flat Washer 3/4" Bushing Extension Arm Holder 3/4" Gate bracket or extension arm 3/4" Flat Washer 3/4" Flat Washer Split Lock Washer 3/4" 3/4"-10 Hex Nut Figure 3 Pivot pin assembly Extension arm holder Extension arm Cotter Pin Figure 4 MODEL SW490 Bottom of angle and top of control arm extension should be level 2"x2"x1/4" angle (by others) gate CCoonntrtorol laramrm exetxetnensisoionn 13