Summary of the content on the page No. 1 
                    
                           
®
OWNER’S
MANUAL
MD
Model No.
139.18847
139.18857
®
The Chamberlain Group, Inc.
GARAGE DOOR OPENER
Cover - SEARS
4/16/92 
1/2 HP
For Residential Use
Only
MD
n Safety Precautions
Caution:
n Assembly
Read and follow all
n Installation
safety rules and
n Adjustment
operating instructions
n Care and Maintenance
before first use of this
n Operation
product.
n Troubleshooting
Fasten the manual
n Parts List
near the garage door
after installation.
®
Sears Canada, Inc., Toronto, Ontario M5B 2B8   
                    
                    Summary of the content on the page No. 2 
                    
                           Contents Page Contents Page A review of safety alert symbols.................................2 Install the lights and lenses ......................................19 You'll need tools..........................................................3 Attach emergency release rope and handle ...........19 Safety information regarding garage door Electrical requirements.............................................20 locks and ropes.........................................................3 Safety revers
                    
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                        1 1    You'll Need Tools During assembly, installation and adjustment of the opener, instructions will call for hand tools shown below. Pencil Carpenter's
 Hack Saw Level Tape Measure Wire Cutters WARNING WARNING Claw Hammer Drill 3/16", 5/16", and 
 Pliers 5/32" Drill Bits Stepladder Screwdriver Adjustable End Wrench 1/2" and 7/16" Sockets
 and Wrench WARNING WARNING CAUTION An unbalanced garage door might not reverse To avoid damage to the garage door and when required and someone under the do
                    
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                         — — —        — — —        — —  — — —        — — —        — —    FINISHED CEILING Support bracket & 
 SECTIONAL Door Installation fastening hardware
 is required.
 Horizontal and vertical reinforcement
 Before you begin, survey your garage area to see whether any of the conditions below apply to your installation. See page 17. is needed for lightweight garage doors
 Slack in Chain Tension
 (fiberglass, steel, aluminum, door with glass panels, etc.).
 is Normal When
 See page 24 for details. Gara
                    
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                        Slack in Chain Tension
 is Normal When
 Garage Door is Closed    One-Piece Door without Track ONE-PIECE Door Installation Before you begin, survey your garage area to see FINISHED CEILING
 whether any of the conditions below apply to your Support bracket
 & fastening hardware
 installation. may be required.
 See page 17. Header
 Wall Closed Position Cable
 Pulley Bracket Trolley Access Door Cable Header
 Bracket T-rail The Chamberlain Group, Inc.
 Door Bracket
 Emergency
 One-Piece Door with Tra
                    
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                            Opener Carton Inventory Your garage door opener is packaged in two cartons which contain all parts illustrated below. If anything is missing, carefully check the packing material. Parts may be "stuck" in the foam. Hardware for assembly and installation is shown on page 7. Security✚ Cable
 Three-Function Remote Control
 with Visor Clip (2) Pulley Bracket Standard Control Console Trolley
 2-Conductor 
 Bell Wire
 White & White/Red T-Rail
 Center Section Header Bracket T-Rail
 End Sections Ligh
                    
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                        NOTICE     Group all hardware found in all packages contained in the rail and opener cartons into the three kits illustrated below. Assembly Hardware Kit 41A3534  Hex Screw
 Nut
 Washered Screw
 Carriage Bolts
 5/16"-18x7/8" (3)
 5/16"-18 (5) 5/16"-18x1/2" (2)
 Master Link (2) 1/4"-20x1/2" (4) (mounted in opener) Lock Nut
 Trolley 
 Lock Washer
 1/4"-20x7/16" (4) Threaded Shaft (1) 5/16" (4) Installation Hardware Kit 41A3475-4 Lag Screw
 Rail Grease 5/16"-9x1-5/8" (2) Hex Screw
 5/16"-18x7/8" (4
                    
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                           Assemble Tee Rail & attach Cable Pulley Bracket
 Assembly Section:  Pages 8 – 11 SEARS '92 (525)
 To avoid installation difficulties, do not run the garage door opener until instructed to do Assemble Tee Rail & attach Cable Pulley Bracket
 so. Assemble Tee Rail & attach Cable Pulley Bracket
 4/16/89 - 6/27/89 - 3/9/92 - 4/13/92 SEARS '92 (525)
 SEARS '92 (525)
 Make sure bolt necks are 4/16/89 - 6/27/89 - 3/9/92 - 4/13/92 4/16/89 - 6/27/89 - 3/9/92 - 4/13/92 Assembly Step 1 seated in the squa
                    
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                           The Chamberlain Group, Inc.
 Step 2 Install Trolley & Attach Chain Retainer Bracket
 The Chamberlain Group, Inc.
 Hardware Shown Sears Chassis
 Assembly Step 2 Actual Size Step 2 Install Trolley & Attach Chain Retainer Bracket
 4/12/92
 Install the Trolley on the T-rail Sears Chassis
 4/12/92
 • Attach the threaded shaft to the trolley with the Trolley lock washer and nuts as shown. Lock Washer Nut Rondelle-frein Écrou de 5/16" 5/16"-18 de 5/16 de po 5/16 de po-18 Trolley Lock Washer
 5/16" O
                    
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                           Assembly Step 4 The Chamberlain Group, Inc.
 WARNING WARNING Step 4 Install Chain & Cable - Sears Chassis
 Install the Chain/Cable & The Chamberlain Group, Inc.
 Attach the Sprocket Cover Serious injury can result if fingers become Opener 
 4/10/92 Sprocket entangled in moving opener sprocket. Attach Step 4 Install Chain & Cable - Sears Chassis
 The Chamberlain Group, Inc.
 sprocket cover securely. Never operate opener Opener 
 4/10/92 Step 4 Install Chain & Cable - Sears Chassis
 Dispensing 
                    
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                           Step 5 Tighten Chain Sears 315-699 Disk 1 (Yellow) Models 53315, 534153, 53615, 53625 & 53699 Rondelle- frein 1/18/89 - 2/9/89 - 4/16/89 - 6/6/89 - 6/27/89 - 12/18/89 - 1/15/92 Écrou extérieur Écrou intérieur Pour visser l'écrou extérieur Pour visser l'écrou intérieur Chariot Chaîne 1/2 pouce Assembly Step 5 Patin du rail Tighten the Chain & Cable Lock Inner Nut Outer Nut Washer • Spin the inner nut and lock washer down the threaded shaft, away from the trolley. To Tighten Outer Nut • To tigh
                    
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                           Installation Section:  Pages 12 – 27 The Chamberlain Group, Inc.
 The Chamberlain Group, Inc.
 Position Header Bracket
 SECTIONAL DOOR AND
 Position Header Bracket
 SECTIONAL DOOR AND
 Installation Step 1 The Chamberlain Group, Inc.
 WARNING WARNING Sectional and One-Piece Track Installations
 Sectional and One-Piece Track Installations
 ONE-PIECE DOOR WITH TRACK ONE-PIECE DOOR WITH TRACK Position Header Bracket
 Determine Header Bracket Location SECTIONAL DOOR AND
 1/30/92 - 4/6/92 1/30/92 -
                    
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                           The Chamberlain Group, Inc. The Chamberlain Group, Inc. Position Header Bracket Position Header Bracket One Piece Door Without Track One Piece Door Without Track 1/30/92 - 4/7/92  1/30/92 - 4/7/92  The Chamberlain Group, Inc. Position Header Bracket Unfinished Unfinished One Piece Door Without Track Header Wall Header Wall Ceiling Ceiling Vertical Vertical 1/30/92 - 4/7/92  Centerline Centerline ONE-PIECE Door Without T 2x4 rack 2x4 Structural Structural supports supports Read the Safety inst
                    
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                           You can attach the header bracket either to the Installation Step 2 wall above the garage door, or to the ceiling. Mounting New Header Bracket
 Follow the instructions which will work best for Install the Header Bracket 10/16/91 - 10/26/91 - 4/5/92 your particular requirements. Mounting Header Bracket to WALL Mounting New Header Bracket
 Fasten the Header Bracket to the Wall Mounting New Header Bracket
 10/16/91 - 10/26/91 - 4/5/92 • Center the bracket on the vertical guideline with • Mark ei
                    
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                           The Chamberlain Group, Inc.
 Attach Tee Rail to Header Bracket
 2/4/92 - 4/9/92 Installation Step 3 Attach the T-rail to the Header Bracket • Position the opener on the garage floor below the header bracket. Use packing material as a protective base. Header Wall If the door spring is in the way you'll need help. Header
 Bracket Have someone hold the opener securely on a temporary support to allow the T-rail to clear the Cable
 spring. Pulley
 Bracket • Position the cable pulley bracket agains
                    
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                        NOTICE    Step 2 Attach Tee Rail to Header Bracket - Sears 315-699 (Yellow Disk #2)
 Models 53315, 53415, 53515, 53625 & 53699
 6/20/89 - 6/27/89 - 11/6/89 WARNING WARNING Rail 2x4 à plat Support de linteau Dessus de l'ouvre-porte Dessus de la porte
 Porte Installation Step 4 CAUTION Manual Disconnect and Lockout
 Position the Opener Escabeau Escabeau Sears -92
 To prevent damage to steel, aluminum, Follow instructions which apply to your door fiberglass or glass panel doors, do not rest the typ
                    
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                           Step 4 Hang Opener 
 Sears '92 Front to Back
 3/26/92 Step 4 Hang Opener 
 Sears '92 Front to Back
 3/26/92 Solives Installation Step 5 WARNING WARNING Hang the Opener Tire-fond de
 The opener could fall and injure someone if it 5/16 de po-18 x 1-7/8 de po  Solives is not properly secured. Fasten the opener Mesurer
 securely to structural supports of the garage. la distance Tire-fond de
 Two representative installations are shown. Structural
 5/16 de po-18 x 1-7/8 de po  Supports Yours may be
                    
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                            WARNING WARNING CAUTION Installation Step 6 WARNING Install the Door Control Do not connect to live electrical wiring. Connect only to 24 Volt low voltage wires. Connection to live wires or higher voltage may cause serious Locate the door control within sight of the door injury from shock, burn or electrocution.  at a minimum height of 5 feet where small Children operating or playing with a garage children cannot reach, and away from all moving door opener can injure themselves or others. pa
                    
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                        NOTICE NOTICE    6. Attach the User Safety Instruction label to the wall Do NOT connect the power and operate the near the door control, and the Maintenance opener at this time. The trolley will travel to the Instruction label in a prominent location on the full open position but will not return to the inside of the garage door. close position until the sensor beam is connected and properly aligned. Page 32 explains how to use the door control. See Safety Reversing Sensor instructions beginning 
                    
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                           Installation Step 9 WARNING WARNING Electrical Requirements To prevent electrocution or fire, installation and wiring must be in compliance with local electrical and building codes. To reduce the risk of electric shock, your garage door opener has a grounding type plug with a third Do NOT use an extension cord, 2-wire adapter, or change the plug in any way to make it fit grounding pin. This plug will only fit into a grounding your outlet. type outlet. Permanent wiring
 If the plug doesn't  fi