Chamberlain LiftMaster Professional BG770 User manual

INSTALLATION INSTRUCTIONS: ARTICULATED ARM
BG770 GATE OPERATORS
Parts Supplied
PART # DESCRIPTION QTY. PART # DESCRIPTION QTY.
01-G0711 Installation Instructions 1 82-HN50-52 1/2-13 x 3-1/4”L Hex Bolt 1
07-8043 1” O.D. x 1/2” I.D. x 1-1/2”L
Spacer 1 84-LH-50 1/2-13 Nylock Nut 1
10-8041 Hinge Plate 2 84-RH-50 1/2-13 Hex Nut 1
12-8041 3/4” O.D. x 3/8” I.D. x 7/8”L
Spacer 2 84-RH-52 1/2-20 Hex Nut 2
12-8049 Female Rod End 2 84-WH-38 3/8-16 Serrated Hex Nut 5
82-HN38-20 3/8-16 x 1-1/2”L Hex Bolt 5 85-FW-50 1/2” Flatwasher 4
82-HN50-22 1/2-13 x 1-3/4”L Hex Bolt 1 85-LS-50 1/2” Lockwasher 3
65-1201-L Lower Arm 1 11-8045 Linkage Rod 1
65-1202-L Extension (Upper) Arm 1
Supplied with “Articulated Wood Arm” Kit, part # 65-1210
Not supplied with “Articulated Wood Arm Hardware Kit”, part # 65-1210-K
Step 1
Drill ½” diameter hole 4-1/2” up from the center of the output shaft and 4-1/2” back from the center of the
output shaft (see Figure 1 below).
SERVICE
ACCESS
DOOR
OUTPUT
SHAFT
8.88
4.50
5.88 4.50
01-G0711F1
Figure 1

Page 2 of 4
01-G0711
Rev B
Step 2
Attach gate arm (lower) to arm hub flange as shown in Figure 2 below.
10-8002
07-8002
14-1201-L
10-8007
HEX BOLT,
1/2”-13 X 2-1/4”
LOCKWASHER,
1/2” HEX NUT
TYPICAL (4X)
01-G0711F2
Figure 2
Step 3
Attach spacer and rod end to unit with hardware shown below in Figure 3.
84-LH-50
07-8043
12-8049
82-HN50-52
85-FW-50
OUTPUT SHAFT
HOLE (REF.)
01-G0711F3
Figure 3

Page 3 of 4
01-G0711
Rev B
Step 4
Assemble hinge plate to lower and upper arms (as shown below in Figure 4).
LINKAGE ROD
11-8045 84-RH-52
X (2)
85-LS-50 X (2)
12-FW-50
12-8049
82-HN50-22
HINGE PLATE
10-8041
12-8041
82-HN38-20
(5X)
EXTENSION
(UPPER) ARM
65-1202-L
12-8041
84-WH-38 (5X)
HINGE PLATE
10-8041
84-RH-50
85-LS-50
85-FW-50
LOWER ARM
65-1201-L
01-G0711F4
Figure 4
Step 5
Place ½-20 nut and ½” lockwasher on linkage rod by the unit and screw rod into rod end mounted on unit.
Step 6
If necessary, level the upper arm by turning the linkage rod.

COPYRIGHT2001
ALL RIGHTS RESERVED
This document is protected by copyright and may not be copied or adapted without the prior written
consent of LiftMaster. This documentation contains information proprietary to LiftMaster and such
information may not be distributed without the prior written consent of LiftMaster. The software and
firmware included in the LiftMaster product as they relate to this documentation are also protected by
copyright and contain information proprietary to LiftMaster.
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Installation and service information is
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Prepare to provide the following
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 Part Number
 Part Name
 Model Number