2-GB
Completed Installation
As you proceed with the assembly, installation and adjustment
procedures in this manual, you may find it helpful to refer back to
this illustration of a completed installation.
(1) Header Sleeve
(2) Chain Pulley Bracket
(3) Trolley
(4) Rail
(5) Chain
(6) Hanging Bracket
(7) Power Cord
(8) Opener
(9) Light Lens
(10) Manual Release
Rope & Handle
(11) Curved Door Arm
(12) Straight Door Arm
(13) Door Bracket & Plate
(14) Header Bracket
(15) Trolley Release Arm
(1) Clevis Pin (1)
(2) Wood Screws (8)
(3) Screws (2)
(4) Clevis Pins (2)
(5) Hex Screws (4)
(6) Rope
(7) Handle
(8) Insulated Staples
(9) Anchors (2)
(10) Lock Washer (7)
(11) Nuts (7)
(12) Ring Fastener (3)
(13) 8mm Anchors (6)
(14) Sheet Metal Screws (4)
(15) Carriage Bolts (2)
(16) Stop Bolt
Hardware Provided
3
4
ASSEMBLY SECTION
IMPORTANT: If you have a canopy or dual track one-piece door,
you need to use the instructions packed with The Chamberlain
Arm™ Accessory in conjunction with this Owner's Manual when
assembling the rail.
Assemble the Rail
NOTE: If your opener came with a one piece rail, proceed to step 8.
Grease inside edges of rail sections using grease (1). Place rail
pieces (2) on flat surface for assembly. All four rail sections are
interchangeable. Slide rail braces (3) onto rail section. Connect rail by
sliding rail brace onto next rail section. Tap rail assembly (4) on piece
of wood (5) until rail sections are flush. Repeat with remaining rail
sections.
5
Install the Chain
Remove chain from carton and lay chain out on floor (do not allow
chain to twist). Push pins of master link bar (3) through chain link (4)
and hole in back end of trolley (5). Push cap (2) over pins and onto
notches. Slide clip-on spring (1) over cap and onto pin notches until
both pins are securely locked in place.
6
Insert Chain into Rail & Assemble Header
Sleeve
Slide pulley bracket (1) and inner trolley (2) into back (opener end) of
rail assembly (3), be sure to insert pulley bracket as shown with arrow
(4) pointing toward front (header end) of rail (5). Push bracket toward
front (header end ) of rail (5). Insert carriage bolt (6) through header
sleeve bracket (7). Loosely thread spring nut (8) onto carriage bolt.
Insert carriage bolt (6) of header sleeve assembly (7) into bold cut out
in pulley bracket (1). Slide header sleeve assembly (7) on to front
(header end) of rail (4).
7
Attach Trolley to Rail
Slide outer trolley (1) into rail assembly (2), be sure arrow on trolley
(3) is heading in direction of door is heading in direction of door (4).
Slide outer trolley down rail until it engages with inner trolley.
8
Attach Chain Spreader
Attach chain spreader (1) to opener (2) with phillips pan head
screws (3).
9
Fasten Rail to Opener & Install Chain
Remove four washered bolts (1) from top of opener. Place rail (2) on
opener, flush with stops (3) on top of opener. Wrap chain (4) around
slot in spreader (5) and over sprocket (6). Push idler pulley bracket
assembly toward front of the rail to eliminate excess slack in chain.
Align bolt holes on brackets (7) with bolt holes on opener. Secure
brackets to opener with previously removed bolts . Tighten bolts
securely. The opener sprocket teeth must engage the chain.
Insert bolt (8) into trolley stop bolt hole (9) secure with lock washer
(10) and nut (11).
CAUTION: Use only those bolts mounted in the top of opener.
Use of any other bolts will cause serious damage to opener.
10
Tools Required
2
Assemble Header Sleeve
Thread spring nut on carriage bolt unit finger tight. Insert a
screwdriver tip (1) into one of the slots of the nut ring (2) and brace it
firmly against the header sleeve. Place an open end wrench (3) on
the square end of the spring nut (4), slightly rotate nut about 1/4 turn
clockwise until nut ring (2) is released against header sleeve (5). This
sets spring to optimum chain tension. chain may slip off sprocket if
chain is too loose. If chain does slip re-tighten spring nut by turing nut
clockwise 1/2 turn. Do NOT overtighten chain.
11
INSTALLATION SECTION
Wear protective goggles when working overhead to protect your
eyes from injury.
Disengage all existing garage door locks to avoid damage to the
garage door.
To avoid serious personal injury from entanglement, remove all
ropes connected to the garage door before installing the opener.
It is recommended that the opener be installed 2,1m (7 feet) or more
above the floor where space permits.
Position the Header Bracket
The header bracket must be rigidly fastened to a structural
support of the garage. Reinforce the wall or ceiling with a 40mm
(1-1/2") board if necessary. Failure to comply may result in
improper operation of safety reverse system.
You can attach the header bracket either to the header wall (1) or to
the ceiling (3). Follow the instructions which will work best for your
particular requirements.
With the door closed, mark the vertical centerline (2) of the garage
door. Extend line onto header wall above the door.
Open door to highest point of travel. Draw an intersecting horizontal
line (4) on header wall 5cm (2") above high point to provide travel
clearance for top edge of door.
12
Install the Header Bracket
NOTE: Refer to vertical center and horizontal lines created in
step 12 for proper placement or header bracket.
A. Wall Mount: Center the bracket (1) on the vertical guideline (2)
with the bottom edge of the bracket on the horizontal line (4)
(with the arrow pointing toward the ceiling). Mark all of the bracket
holes (5). Drill 4,5mm (3/16") pilot holes and fasten the bracket
with wood screws (3). For concrete mount, use concrete anchors
provided.
B. Ceiling Mount: Extend vertical guideline (2) onto the ceiling.
Center the bracket (1) on the vertical mark no more than 150mm
(6") from the wall. Make sure the arrow is pointing toward the wall.
Mark all of the bracket holes (5). Drill 4,5mm (3/16") pilot holes and
fasten the bracket with wood screws (3). For concrete ceiling
mount, use concrete anchors (6) provided.
13
Attach Rail to Header Bracket
Position opener on garage floor below the header bracket. Use
packing material to protect the cover. Raise rail until holes in the
header sleeve and holes in the header bracket align. Join with clevis
pin (1). Insert ring fastener (2) to secure.
NOTE: To enable the rail to clear sectional door springs, it may be
necessary to lift opener onto a temporary support. The opener must
either be secured to a support or held firmly in place by another
person.
14
114A2788C-GB
Summary of Contents for LiftMaster Professional 3780
Page 11: ...2 A B E C D 114A2789C 1 2 1 10mm 8mm 4 5mm 4mm 11mm 13mm 2...
Page 13: ...4 114A2789C 2 3 4 5 1 2 5 7 1 2 5 3 4 6 5 3 1 2 4 8 7 6 1 6 7 4 6 8...
Page 14: ...5 114A2789C 8 9 10 11 8 11 10 1 6 2 3 4 6 5 3 5 10 1 3 2 9 1 2 3 4 5 11 1 3 3 2 4 8...
Page 15: ...6 114A2789C 2 50mm 2 3 1 4 B A 3 6 150mm 6 1 2 3 5 5 5 5 5 5 5 13 3 1 2 4 12...
Page 16: ...7 114A2789C A C 3 1 2 2 5 5 2 3 1 2 3 1 B 2 4 1 3 3 2 6 6 6 16 1 2 2 1 14 1 15...
Page 19: ...10 114A2789C A B C X 433 MHz 250mm TB1 TB1 28 1 26 27 3 2 24 1 1 2x 25 1 1 2x...
