LiftMaster J door operator - Manual (Page 8)

TROLLEY
8 Assembly - Trolley
INSTALL THE CHAIN (MODELS T AND GT)
3˝
2˝
1
2
4
5
6
3
NOTE: For Model APT assembly refer to page 9.
1
Position the trolley 2 inches away from the front idler.
2
Attach the chain to the trolley threaded shaft using the master
link.
3
Run the chain along the track to the operator. Wrap the chain
around the operator drive sprocket.
4
Run the chain along the track to the front idler. Wrap the chain
around the front idler.
5
Attach the chain to the front of the trolley using the master
link.
6
Tighten the chain until the chain sags about 3 inches at the
mid point of the track.
MODEL T
MODEL GT