The safety reverse system test is very important. Your
garage door
MUST reverse on contact with a 25mm (1")
obstacle placed on the floor. Failure to properly adjust the
opener may result in serious personal injury from a closing
garage door.
Repeat the test once a month and make
any needed adjustments.
The force, as measured on the closing edge of the
door, should not exceed 150 N (15kg). If the closing
force is adjusted to more than 150 N, the Protector
System must be installed. Do not use the force
adjustments to compensate for a binding or sticking
garage door. Excessive force will interfere with the proper
operation of the Safety Reverse System or damage the
garage door.
START BY READING THESE IMPORTANT SAFETY RULES
These safety alert symbols mean
Caution – a personal safety or property damage instruction. Read these instructions carefully.
This garage door opener is designed and tested to offer reasonable safe service provided it is installed and operated in strict
accordance with the following safety rules.
Failure to comply with the following instructions may result in serious personal injury or property damage.
Do not wear rings, watches or loose clothing while
installing or servicing a garage door opener.
To avoid serious personal injury from entanglement,
remove all ropes connected to the garage door before
installing the door opener.
Install the lighted door control button (or any additional
push buttons)
in a location where the garage door is
visible, but out of the reach of children. Do not allow
children to operate push button(s) or remote
control(s). Serious personal injury from a closing garage
door may result from misuse of the opener.
CAUTION: Activate opener only when the door is in
full view, free of obstructions and opener is properly
adjusted. No one should enter or leave the garage
while the door is in motion. Do not allow children to
play near the door.
Use manual release only to disengage the trolley and, if
possible, only when the door is closed.
Do not use the
red handle to pull the door open or closed.
Disconnect electric power to the garage door opener
before making repairs or removing covers.
Caution: If your garage has no service entrance door, Model 1702E Outside Quick Release must be installed. This accessory
allows manual operation of the garage door from outside in case of power failure.
CONTENTS
SAFETY RULES: Page 1
DOOR TYPES: Page 1 – Illustration
TOOLS REQUIRED: Illustration
HARDWARE PROVIDED:
Page 1 – Illustration
BEFORE YOU BEGIN: Page 2
COMPLETED INSTALLATION:
Page 2 – Illustration
ASSEMBLY: Page 2 – Illustrations –
INSTALLATION:
Pages 3-4 – Illustrations –
ADJUSTMENT:
Pages 4-5 – Illustrations –
INSTALL THE PROTECTOR SYSTEM™:
(Optional): Page 5 – Illustration
OPERATION OF YOUR OPENER: Page 5
CARE OF YOUR OPENER: Page 5
PROBLEMS: Page 6
MAINTENANCE OF YOUR OPENER: Page 7
SPECIAL FEATURES OF THE 3750E-1A:
Page 7 – Illustration
ACCESSORIES: Page 7 – Illustration
SPECIFICATIONS: Page 7
REPLACEMENT PARTS:
Page 7 – Illustrations
– 29
28
26
Disengage all existing garage door locks to avoid
damage to garage door.
Installation and wiring must be in compliance with your
local building and electrical codes.
Connect the power
cord only to properly earthed mains.
Keep garage door balanced. Sticking or binding doors
must be repaired. Garage doors, door springs, cables,
pulleys, brackets and their hardware are under extreme
tension and can cause serious personal injury.
Do not
attempt to loose, move or adjust them. Call for garage
door service.
Lightweight doors of fiberglass, aluminum or steel
must be substantially reinforced to avoid door
damage. (See page 4.) The best solution is to check with
your garage door manufacturer for an opener installation
reinforcement kit.
Fasten the caution label adjacent to the lighted door
control button as a reminder of safe operating procedures.
1
5
4
11
10
21
22
24
27
25
2
3
1-GB
HARDWARE PROVIDED – 3
Assembly Hardware:
(1) Washered Screws (2)
(2) Hex Screws (2)
(3) Nuts (2)
(4) Lock Washers (2)
(5) Master Links (2)
(6) Carriage Bolts (4)
(7) Lock Nuts (4)
(8) Flat Washers (2)
(9) Hex Screws (2)
(10) Trolley Threaded
Shaft (1)
(11) Clevis Pin (1)
Installation Hardware:
(12) Carriage Bolts (2)
(13) Wood Screws (4)
(14) Screws (2)
(15) Clevis Pins (2)
(16) Hex Screws (5)
(17) Rope
(18) Handle
(19) Insulated Staples
(20) Anchors (2)
(21) Lock Washers (8)
(22) Nuts (9)
(23) Ring Fasteners (3)
(24) Rail Grease
(25) Tension Assembly
(26) 8mm Anchors (4)
(27) Sheet Metal
Screws (2)
DOOR TYPES – 1
A. One-Piece Door with Horizontal Track Only
B. One-Piece Door with Horizontal and Vertical Track – Special door arm
(F, The Chamberlain Arm™) required. See your dealer.
C. Sectional Door with Curved Track – See B – connect door arm.
D. Double-wing door – Special door arm required. See your dealer.
E. Canopy door – Special door arm (F, The Chamberlain Arm™)
required. See your dealer.
20
This product is provided with a cable of special design
which, if damaged, must be replaced by a cable of the
same type; such a cable may be obtained from your local
Lift-Master distributor and must be fitted by a specialist.
This unit should not be installed in a damp or wet
space.
