CAUTIONWARNINGHeader bracket must be fastened to garageframing. Do Not fasten to drywall, particleboard, plaster or other such materials.1. Establish center line of door and header (Fig. 2-9).• Close door.• Measure door width. Mark center.• Use straight edge to draw vertical line “V.”– down door about 6.”– on top of door.– up header about 20”.2. Determine door rise (Fig. 2-10).• Open door to highest point of travel.• Measure distance from top of door to floor.• Subtract the actual height of door. The remainderis the door rise in inches as shown in TABLE A.• Do Not try to remove, repair or adjust springs oranything to which door spring parts are fastened,such as, wood blocks, steel brackets, cables orother like items.Repairs and adjustments must be made by atrained service person using proper toolsand instructions.• Handles and other door projections can catchclothing. Remove ropes, hooks, hangers,decorative or security items mounted to door.• Be sure emergency release cord does not catchon roof carrier or other vehicle parts.4. Install header bracket (Fig. 2-11).• Place header bracket so,– center hole is on line “V.”– all holes are on line “H.”• Mark hole positions (“A” and “B”).• Drill 5/32” holes at marked positions.• Fasten header bracket to header with two (2)1/4” x 2” lag screws [79].Fig. 2-11Line “V”Line “H”“A”“B”Header bracketLag screwsVertical centerlineof doorFig. 2-9Top of doorSeeTABLE ALine “H”Inside of doorDoor headerLine “V”(Vertical centerline of door)Door rise Locate header bracket abovein inches top edge of CLOSED doorUp to 4” Up to 10”4” to 8” 10” to 15”8” to 12” 15” to 20”TABLE AFig. 2-10Highest pointof travelDoor riseHighest pointof travelFloor Floor3. Locate header bracket (Fig. 2-9).• Use TABLE A to determine headerbracket position.• Draw horizontal line “H” across line “H” atthis point.Door rise152B ... FOR TRACKLESS DOORS[79]