Chamberlain WD962KPEV - Tighten Belt and Install Sprocket Cover

10
To avoid possible SERIOUS NJURY to finger from moving garage door opener:
• ALWAYS keep hand clear of sprocket while operating opener.
• Securelyattach sprocketcover BEFORE operating.
H8
Spring Trolley Nut
H9 (3)
Hex Screw #8x3/8"
(Packed with the
sprocket cover)
HARDWARE
5.1 By hand,thread the spring trolleynut on the
threaded shaft (H8) until it is finger tight
againstthe trolley.Do notuse any tools.
Remove the screwdriver.
H8
(to motor unit)
5.2 Insert a flathead screwdriver tip into one
of the nutring slots and brace it firmly
againstthe trolley.
Nut ring slot
5.3 Tighten the spring trolley nut with an adjustable wrench or a 7/16" open end wrench abouta quarter turn until the spring releasesand snaps the
nut ring againstthe trolley.This sets the spring to optimumbelttension.
Nut Ring
BEFORE
1"
(2.5 cm)
Nut Ring
AFTER
1-1/4"
(3.18 cm)
5.4 Position the sprocket cover over the garage
door opener sprocket and attach with hex
screws(H9).
H9
Assembly
5 Tighten the belt and install the sprocket cover