Chamberlain LiftMaster Professional BG770 User manual

1
Service
Access
Door
4.5
4.5
5.88
8.88
Output
Shaft
ARTICULATED ARM
GATE OPERATORS
MODEL BG770
INSTALLATION
Drill 1/2" 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
(Figure 1).
Attach gate arm (lower) to arm hub flange (Figure 2).
1
2
CARTON INVENTORY
PART # ITEM QTY
01-G0711 Installation Instructions 1
07-8043 1" O.D. x 1/2" I.D. x 1-1/2"L Spacer 1
10-8041 Hinge Plate 2
12-8041 3/4" O.D. x 3/8" I.D. x 7/8"L Spacer 2
12-8049 Female Rod End 2
82-HN38-20 3/8"-16 x 1-1/2"L Hex Bolt 5
82-HN50-22 1/2"-13 x 1-3/4"L Hex Bolt 1
65-1201-L Lower Arm* 1
65-1202-L Extension (Upper) Arm* 1
82-HN50-52 1/2"-13 x 3-1/4"L Hex Bolt 1
84-LH-50 1/2"-13 Nylock Nut 1
84-RH-50 1/2"-13 Hex Nut 1
84-RH-52 1/2"-20 Hex Nut 2
84-WH-38 3/8"-16 Serrated Hex Nut 5
85-FW-50 1/2" Flatwasher 4
85-LS-50 1/2" Lockwasher 3
11-8045 Linkage Rod* 1
* Supplied with “Articulated Wood Arm” Kit, part # G651210
* Not supplied with “Articulated Wood Arm Hardware Kit”, part # G651210K
Hex Bolt,
1/2"-13 x 2-1/4"
Lockwasher,
1/2" Hex Nut
Typical (X4)
Gate Bracket
Lower Arm Gate Arm Hub
Barrier Gate Enclosure
Figure 2
Figure 1
CALCULATE ARM LENGTH
To calculate the arm length:
Subtract the height of the output shaft and concrete pad (40")
from the height to ceiling.
EXAMPLE:
If height to ceiling is 8'3" (99"), calculation is as follows:
99" (height to ceiling) - 40" (height of the output shaft and
concrete pad) = 59"
Lower arm should be 59".

© 2010, The Chamberlain Group, Inc.
01-G0711C All Rights Reserved
INSTALLATION CONTINUED
Attach spacer and rod end to unit (Figure 3).
Assemble hinge plate to lower and upper arms (Figure 4).
Place ½"-20 hex nut and ½" lockwasher on linkage rod by the
unit and screw rod into rod end mounted on unit (Figure 5).
If necessary, level the upper arm by turning the linkage rod.
5
4
3
6
Hex Bolt
1/2"-13 x 3-1/4"
Female Rod End
Spacer
1-1/2" L
Nylock Nut
1/2"-13
Flatwasher 1/2"
Output Shaft
Hole (Ref.)
Extension
(Upper) Arm
Serrated Hex Nut
3/8"-16 (5)
Hex Nut
1/2"-13
Hinge Plate
Lockwasher
1/2"
Flatwasher
1/2"
Lower
Arm
Hex Bolt
1/2"-13 x 1-3/4"
Hinge
Plate
Hex Bolt
3/8"-16 x 1-1/2"
(5)
Spacer 7/8"L
Spacer 7/8"L
Linkage Rod
Hex Nut
1/2"-20 (2)
Lockwasher 1/2" (2)
Flatwasher 1/2"
Female Rod End
Figure 4
DETAIL B
DETAIL A
Hex Bolts (4)
Hex Nut
Hex Bolt
Flat Washer
Hex Bolt
Flat Washer (2)
Flat Washer (2)
Hex Nut
Hex Nut
Flat Washer
Threaded Spacer
Flat Washer
Flat Washer
Hex Bolt
Extension Arm
See Detail A
See Detail B
Linkage Rod
Linkage Rod
Lower Arm
Allenhead Screw
Figure 3
Figure 5