10
Assembly
STEP 5 Tighten the belt
1. Byhand,thread the spring trolleynut on the threaded shaft until it is finger tight againstthe
trolley.Do not use any tools. Remove the screwdriver.
2. Inserta flathead screwdriver tip into one of the nut ring slots and brace itfirmlyagainst the
trolley.
3. Tighten the spring trolleynut with an adjustable wrench or a 7/16" open end wrench about a
quarter turn until the spring releasesand snaps the nutring againstthe trolley.This sets the
spring to optimum belttension.
Spring
Trolley Nut
Nut Ring Slot
Nut RingNut Ring
AFTER
1-1/4" (3.18 cm)
BEFORE
1" (2.5 cm)
STEP 6 Install the sprocket cover
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
l ALWAYS keep hand clear of sprocket while operating opener.
l Securelyattach sprocket cover BEFORE operating.
1. Position the sprocketcover over the sprocket asshown and fasten to the mounting plate with
8x3/8" hex screws provided.
You have now finished assembling your garage door opener. Please read the following warnings
before proceeding to the installation section.
Hex Screw #8x3/8"
(Packed with the sprocket cover)
HARDWARE
Hex Screw #8x3/8"
Sprocket Cover
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