LiftMaster ATS ATS2113X Manual - Page 20

INSTALLATION STEP 12 Connect Door Arm to Trolley SECTIONAL DOORS ONLY • Make sure garage door is fully closed. Pull the emergency release handle to disconnect the outer trolley from the inner trolley. Slide the outer trolley back (away from the door) about 2" (5 cm) as shown in Figures 1, 2 and 3. • Figure 1: - Fasten straight door arm section to outer trolley with the 5/16"x1" clevis pin. Secure the connection with a ring fastener. - Fasten curved section to the door bracket in the same way, using the 5/16"x1-1/4" clevis pin. IMPORTANT: The groove on the straight door arm MUST face away from the curved door arm (Figure 4). • Figure 2: - Bring arm sections together. Find two pairs of holes that line up and join sections. Select holes as far apart as possible to increase door arm rigidity. • Figure 3, Hole alignment alternative: - If holes in curved arm are above holes in straight arm, disconnect straight arm. Cut about 6" (15 cm) from the solid end. Reconnect to trolley with cut end down as shown. - Bring arm sections together. - Find two pairs of holes that line up and join with bolts, lock washers and nuts. • Proceed to Adjustment Step 1, page 21. Trolley will re-engage automatically when opener is operated. Figure 1 Inner Trolley Outer Trolley Ring Fastener Clevis Pin 5/16"x1" Figure 2 Door Bracket Straight Door Arm Curved Clevis Pin Door Arm 5/16"x1-1/4" Lock Washers 5/16" Nuts 5/16"-18 Emergency Release Handle Figure 3 Door Bracket Bolts 5/16"-18x7/8" HARDWARE SHOWN ACTUAL SIZE Nut 5/16"-18 Ring Fastener Clevis Pin 5/16"x1-1/4" Lock Washer 5/16" Nuts 5/16"-18 Lock Washers 5/16" Figure 4 CORRECT Bolts 5/16"-18x7/8" Cut This End INCORRECT Clevis Pin 5/16"x1" Hex Bolt 5/16"-18x7/8" Straight Door Arm (Groove facing out) Curved Door Arm Straight Door Arm Curved Door Arm 20