15. Pull the belt around the idler pulley and hook the
trolley connector into the retaining slot on the trolley
as shown in Figure 4. The dbbed side must contact
16. With the trolley against the pliers, dispense the
remainder of the belt along the rail assembly toward
the powerhead end around the sprocket. The
sprocket teeth must engage the belt.
17. Check to make sure the belt is not twisted, then
connect it to the fiat end of the trolley threaded shaft
with the master link, as shown:
• Push pins of master link bar through holes in end
of belt and trolley threaded shaft.
• Push master link cap over pins and past pin
• Slide clip-on spring over csp and onto pin notches
until both pins are securely locked in place.
18. Insert the trolley threaded shaft through the hole in
the trolley. Be sure the be# is not lwisted, and the
dbbed side faces the rail.
19. Hold the belt at the trolley shaft as you thread the
spring nut by hand (Figure 5) onto the shaft until
finger tight against the trolley. Do not use any tools.
20. Remove the locking pliers.
21. Set the belt tension:
• Insert a screwdriver tip into one of the nut dng slots
sr_l brace It firmly agak_stthe trolley,as shown.
- Place a 7/16' open end wrench on the square end.
Rotate the nut about 1/4 turn untilthe spring releases
and ,snapsIhe nut ring against file _011ey, F igure 6.
This sets the springto optimum belt tension.
22. Replace the belt cap reta'mer and complete the re-
installation and adjustment of your opener according
tO your owner's manual.
23. Replace the old emergency release rope with the
new, longer replacement rope.
24. Reconnect power and operate the door in the UP
25. Increase the UP travel limit by turning the UP limit
adjustment screw in e _
direction as shovm
on label. One turn equals 2" of travel.
Master Unk Ca
Header rail extensiOn ........
8' Belt Assembly ............
Master llnk Kit .............
Spring Nut Assembly ........
01999, Seam, Roebuck& Co,