Chamberlain LiftMaster Professional 50-1950 User manual

1. Assemble post bracket assembly by placing push-to-open bracket
between the two post brackets as shown. Insert 3/8" hex bolt through
middle hole. Fasten with lock washer, flat washer and nut (Figure 1).
2. With gate in open position (90˚ from closed position), clamp bracket
assembly to post using C clamp.
3. Rotate the push-to-open bracket or the entire post bracket assembly
to obtain desired dimensions (Figure 2).
4. Once dimensions are obtained, insert 5/16" hex bolt and fasten with
flat washer, lock washer, and nut to secure pivot point.
5. Mount operator to bracket assembly clamped to post by inserting
push-to-open bracket into slot on motor side of operator. Insert pin
and hairpin clips to secure (Figure 3).
6. Mount gate bracket to actuator side of operator with pin and hairpin
clips (Figure 3).
Figure 1
Figure 2
Figure 3
Push-to-Open Kit
Model 50-1950
3/8" Hex Bolt
Post Bracket
Push-to-Open Bracket
Post Bracket
3/8" Flat Washer
3/8" Lock Washer
3/8" Nut
Center of Gate Hinge
5/16" Hex Bolt
Special Post Pivot Bracket for
Push-to-Open Installation
7-3/4"
7-3/4"
90°
Pin
Hex Bolt
Post Bracket
Push-to-Open Bracket
Lock Washer
Nut
Hairpin Clip
Hairpin Clip
Pin
Gate Bracket
Flat Washer

© 2008, The Chamberlain Group, Inc.
01-32479B All Rights Reserved
7. With gate open and operator in retracted position, clamp bracket to
cross member, using C clamp. Adjust operator until assembly is
level. Tighten in place at this time (Figures 4 & 6).
NOTE: All four mounting holes must be used.
8. Once brackets are clamped in place, remove clevis pins and
washers to detach operator.
9. Mark reference points for bolt holes on fence posts and cross
member. Be sure to mark holes in the vertical center of post
bracket slots (Figure 5).
10. Remove brackets from gate post and cross member.
11. Drill 13/32" holes in marked locations for gate post and 11/32" for
gate bracket.
12. Secure post bracket assembly to gate post with 3/8"-16 x 6"
carriage bolts, flat washers, lock washers and nuts. Secure gate
bracket to cross member with 5/16" carriage bolts, flat washers,
lock washers and nuts.
13. Reattach operator to gate.
Figure 4
Figure 5
Figure 6
BATTERY REPLACEMENT
1. Disconnect power to operator.
2. Open the control box cover.
3. Remove all quick connect terminals in use to the control
board. Remember location of all wire connections for
reinstallation.
4. Remove control board and mounting plate.
5. Disconnect terminals leads to both batteries.
6. Replace both batteries and connect red wires to the positive
(+) terminals (red). Connect black wires to the negative (-)
terminals (black).
7. Install control board and mounting plate.
8. Reconnect all quick connect terminals to the control board.
9. Close cover of control box.
10. Reconnect power to operator.
To avoid SERIOUS personal INJURY or DEATH from
electrocution, DISCONNECT electrical power to operator
BEFORE proceeding.
To reduce the risk of FIRE or INJURY to persons use ONLY
Chamberlain part #K74-30762 for replacement batteries.
Gate in Open Position
LEVEL Horizontal Cross Member
Mark cross member through middle of
gate bracket slots and drill 11/32" holes
Mark fence post through middle of
bracket slots and drill 13/32" holes
Post Bracket Assembly
3/8"-16 x 6" Carriage Bolt
Operator MUST be level
Post Bracket
Assembly
C Clamp
Gate in OPEN Position Gate Bracket
C Clamp
Batteries
Control Board and
Mounting Plate
Fence Post