LiftMaster 3800 3800 Manual - Page 4

Preparing your Garage Door Before you begin: • Disable locks. • Remove any ropes connected to garage door. • Complete the following test to make sure your garage door is balanced and is not sticking or binding: 1. Lift the door about halfway as shown. Release the door. If balanced, it should stay in place, supported entirely by its springs. 2. Raise and lower the door to see if there is any binding or sticking. If your door binds, sticks or is out of balance, call a trained door systems technician. 3. Verify equal cable tension on each side of door. Cable tension should remain equal during the entire travel of the door. WARNING To prevent possible SERIOUS INJURY or DEATH: CAUTION • ALWAYS call a trained door systems technician if garage door binds, sticks or is out of balance. An unbalanced garage door may not reverse when required. • NEVER try to loosen, move or adjust garage door, door springs, cables, pulleys, brackets or their hardware, ALL of which are under EXTREME tension. • Disable ALL locks and remove ALL ropes connected to garage door BEFORE installing and operating garage door WARNING opener to avoid entanglement. CAUTION To prevent damage to garage door and opener: • ALWAYS disable locks BEFORE installing and operating the opener. • ONLY operate garage door opener at 120V, 60 Hz to avoid malfunction and damage. Sectional Door Tools needed During assembly, installation and adjustment of the opener, instructions will call for hand tools as illustrated below. Stepladder 12 Drill Tape Measure 5/32", 3/16", 5/16" and 3/4" Drill Bits Pencil Pliers Wire Cutters Claw Hammer 3/16" and 1/8" Hex Key Wrench 1/4", 5/16" & 3/8" Sockets and Wrench with 6" Extension Screwdriver Adjustable End Wrench Needle Nose Pliers 4