Chamberlain WD962KEV Installation Guide download pdf (Page 10)

Tighten the belt and install the sprocket cover

(to motor unit)

5.1 By hand, thread the spring trolley nut

on the threaded shaft (H8) until it is

ﬁ nger tight against the trolley. Do not

use any tools.

Remove the screwdriver.

5.2 Insert a ﬂ athead screwdriver tip into

one of the nut ring slots and brace it

ﬁ rmly against the trolley.

5.3 Tighten the spring trolley nut with an adjustable wrench or a 7/16" open end wrench about a quarter turn until the spring releases

and snaps the nut ring against the trolley. This sets the spring to optimum belt tension.

5.4 Position the sprocket cover over

the garage door opener sprocket

and attach with hex screws (H9).

Spring Trolley Nut

H9 (3)

Hex Screw #8x3/8"

(Packed with the

sprocket cover)

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

• ALWAYS keep hand clear of sprocket while operating opener.

• Securely attach sprocket cover BEFORE operating.

Nut Ring

BEFORE

(2.5 cm)

Nut Ring

AFTER

1-1/4"

(3.18 cm)

HARDWARE

Assembly

Nut ring slot

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Chamberlain WD962KEV Installation Guide Page 10