User manual LIFT-MASTER 65 5208

[. . . ] DUAL TROLLEY MODIFICATION (For Use With Models: T and GT ) 65-5208 and 65-52081 APPLICATION REQUIREMENTS: This modification is available to model T and GT operators. and higher drawbar operators use #41 drive chain. FUNCTIONS: Provides stabilization of drive system on very wide (over 22 ft. ) standard lift sectional doors utilizing drawbar operators. [. . . ] Determine the rough spacing of the two tracks, generally they are separated by 1/3 to 1/2 the door width. We have supplied a cross header shaft that is one half the door width. Assemble the operator per the installation manual but with the special idler and coupler assembly at the header end of the track in place of the standard front idler. Assemble the second track the same way as the operator but at the operator end of the track install a standard front idler. Install the operator in the location that was determined in step 1 and 2. Install the second track assembly, taking care that the two tracks are parallel to each other. Install a 48B14 sprocket on one end of the cross header shaft by drilling through the hub and shaft and securing with a 1/4" x 1-1/2" roll pin. Be sure that the shaft is flush with the sprocket (Refer to Figure 2). Determine the distance between the two coupler sprockets on the track assemblys and cut the cross header shaft to that length. If the shaft is to long and is sagging in the middle you may have to install one or two bearings for extra support. [. . . ] Complete the installation per the trolley instructions. FIGURE 1 TROLLEY HOIST IDLER ASSEMBLY CROSS HEADER SHAFT COUPLER SPROCKETS COUPLE SPROCKETS TOGETHER WITH #40 CHAIN AND MASTER LINK 2 DUAL TROLLEY MODIFICATION TROLLEY HOIST IDLER ASSEMBLY SHAFT COUPLING STANDARD IDLER ASSEMBLY BEARING ASSEMBLY TROLLEY HOIST IDLER ASSEMBLY TRACK SPACERS DOOR POWER HEAD FIGURE 2 48B14 SPROCKET 1" BORE 1" DIAMETER SHAFT BE SURE SHAFT IS FLUSH WITH SPROCKET. DO NOT LET SHAFT PROTRUDE BEYOND SPROCKET. DRILL 1/4" HOLE - PIN WITH 1/4" x 1-1/2" ROLL PIN 3 01-12198D © 2000, The Chamberlain Group, Inc. [. . . ]