Chamberlain HD930EV User Manual download pdf (Page 10)

Assembly

STEP 5 Tighten the belt

1. By hand,thread the spring trolley nut on the threaded shaft until it is finger tight againstthe

trolley.Do notuse any tools. Remove the screwdriver.

2. Insert a flathead screwdriver tip into one of the nut ring slots and brace itfirmly againstthe trolley.

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 setsthe

spring to optimumbelttension.

Nut Ring

BEFORE

(2.5

cm)

Nut Ring

AFTER

1-1/4"

(3.18 cm)

Nut Ring Slot

Spring Trolley

STEP 6 Install the sprocket cover

To avoid possible SERIOUS INJURY to finger from moving garage door opener:

ALWAYS keep hand clear of sprocket while operating opener.

Securelyattach sprocket cover BEFORE operating.

1. Position the sprocket cover 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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Chamberlain HD930EV User Manual Page 10