LiftMaster T T MECHANICAL Manual - Page 3

PREPARATION WARNING KEEP DOOR BALANCED. STICKING OR BINDING DOORS MUST BE REPAIRED. DOORS, DOOR SPRINGS, CABLES, PULLEYS, BRACKETS AND THEIR HARDWARE MAY BE UNDER EXTREME TENSION AND CAN CAUSE SERIOUS PERSONAL INJURY OR DEATH. CALL A PROFESSIONAL DOOR SERVICEMAN TO MOVE OR ADJUST DOOR CAUTION SPRINGS OR HARDWARE. TRACK ASSEMBLY 1. Using the 3/8"-16 x 3/4 " bolts and flange hex nuts supplied, assemble the operator track by installing and tightening the track spacer brackets. Position the spacers evenly over the length of the track. NOTE: The nylon pad on the spacer bracket should face up. 2. Using (2) 3/8"-16 x 1" bolts and lock washers, install the front idler assembly to the second set of holes of one end of the track. Refer to the illustration below. 3. Slide the trolley carriage onto the track so that the take-up bolt will be toward the operator. POWERHEAD ATTACHMENT WARNING 1. Position the track assembly on the frame of the powerhead so that the motor side of operator is in back (away from door ). 2. Loosely install two 3/8"-16 x 3/4" bolts and nuts in third hole from the end of the track . 3. Align the track so that the bolts inserted in step 2 line up with the L-Slots in the frame. WARNING 4. Connect the track to the powerhead by fastening two 3/8"-16 x 3/4" bolts and nuts through the frame and the end holes in track. Tighten all four bolts to secure the track to the powerhead. TROLLEY CARRIAGE / CHAIN ATTACHMENT 1. Attach the take-up bolt to the trolley carriage using 3/8-16 hex nuts and lock washer, as shown below. 2. Using one of the master links, attach the chain to the other end of the trolley carriage. Reel the chain around the front idler shaft, over the spacer brackets, back to the drive shaft sprocket, and then to the takeup bolt on the carriage. 3. Using the other master link, attach the chain to the take-up bolt and tighten to the desired chain tension. FRONT IDLER ASSEMBLY Reel Chain around Idler and over Spacer Brackets Chain Tension: With trolley positioned at either end of the track, a properly adjusted chain will sag about 3" at the mid-point. If necessary, remove links from the chain to achieve proper adjustment. TROLLEY CARRIAGE TROLLEY ASSEMBLY Master Link Hex Nut Lockwasher Trolley Carriage Takeup Bolt Hex Nut Master Link Roller Chain Take-Up Bolt SPACER BRACKET (Mounted Nylon Pad Side Up) L - SLOT Straight Arm 3