Assemble The Operator (Model Apt) - Chamberlain GH Installation Manual

ASSEMBLE THE OPERATOR (MODEL APT)

NOTE: If your model is not an APT, proceed to the next page.
1
Install the track spacers evenly over the length of the track.
Fasten the spacers to the track with bolt (A) and fl ange hex
nuts (B).
2
Install the front idler in the second set of holes on the end of
the track with bolts (A) and nuts (B).
3
Slide the trolley onto the track so the door arm hole faces the
front (towards the door).
4
Insert bolts (A) into the end of the track and loosely thread
the nuts (B) onto the ends of the bolts. Slide bolts (A) on the
end of the track assembly into the "L" slot in the operator and
tighten nuts (B).
5
Insert bolts (A) into the holes on the end of the track and the
operator. Secure the track with nuts (B).
6
Run the chain along the track to the front idler. Wrap the
chain around the front idler.
7
Run the chain along the track to the operator. Wrap the chain
around the operator drive sprocket.
2
3
6
8
9
10
9
HARDWARE
A
Bolt 3/8"-16 x 3/4"
8
Pull the release clip on the trolley and push the end of the
chain through the slot in the trolley.
9
Attach one end of the chain to the drive link using a master
link.
10
Attach the other end of the chain to the free end of the drive
link using a master link and making sure the chain has the
correct tension (the chain should sag about 3 inches at the
mid point of the track). The chain will need to be cut for
proper adjustment. The take-up bolt can be loosened or
tightened to adjust the slack of the chain. Slide the trolley
back and forth past the drive chain to ensure there is no
binding.
1
5
3˝
B
Flange Hex Nut
3/8"-16
4
7
Assembly - Trolley