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IF THIS IS AN EXISTING INSTALLATION (CONTINUED):
9. Install idler pulley assembly (Figure 7).
10. As a temporary stop, insert a screwdriver into the hole near the rail
tab. Slide the trolley to this point.
11. Use a flathead screwdriver to lift the rail tab until the tab is vertical (90°)
(Figure 8).
12. Pull the chain around the idler pulley. Connect the chain to the
retaining slot on the trolley with master link, as shown.
13. With the trolley against the screwdriver, pull the chain along the rail
toward the motor unit around the sprocket to the trolley assembly. The
sprocket teeth must engage the chain (Figure 9).
14. Connect the chain extension piece to the full chain with the master link.
15. Check to make sure the chain is not twisted, then connect it to the
threaded shaft with master link.
16. Insert the trolley threaded shaft through the hole in the trolley. Be sure
the chain is not twisted. Loosely thread the outer nut onto the trolley
threaded shaft. Remove the screwdriver.
Figure 7
Idler Pulley
ADD AN ADDITIONAL SUPPORT BRACKET:
Cut the enclosed support bracket to fit across the installed support
brackets. Fasten the cross brace to the top and bottom hole of the support
brackets using 5/16" -18x7/8" hex bolts, 5/16" lock washers and 5/16" -18
nuts.
Lock Washer 5/16"
Nut 5/16"-18
Lock Washer 5/16"
Nut 5/16"-18
Rail Tab
Figure 8
Support Bracket
Hex Bolt 5/16"-18x7/8"
17. Tighten the outer nut until the chain is approximately 1/4" (6 mm)
above the base of the rail at it's midpoint. Tighten the inner nut to
secure the adjustment (Figure 10).
18. Replace the old emergency release rope with the new, longer
replacement rope using overhand knots.
19. Refer to Installation Step 5 in your owner's manual to complete the
re-installation and adjustment of your garage door opener. NOTE: After
hanging the opener, add the additional support bracket for stability.
See Add An Additional Support Bracket below.
20. Reconnect door control and sensor wires.
21. Reconnect power.
22. Program travel limits and test the safety reversal system according to
the owner's manual.
Figure 9
Master Link
Inner nut
Trolley
Master Link
Outer Nut
Retaining Slot
Figure 10
Chain
Base of Rail
To avoid possible SERIOUS INJURY from a falling garage door opener,
fasten it SECURELY to structural supports of the garage. Concrete
anchors MUST be used if installing any brackets into masonry.
REPLACEMENT PARTS
Part No.
041B1986-08
41A3021
4A1008
Master Link
Trolley
Chain Extension
Threaded
Piece
Shaft
1/4" (6 mm)
Mid length of Rail
Description
Eight-Foot Chain
Emergency Release Rope
Master Links (2)
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