Chamberlain WD912K User Manual download pdf (Page 10)

ASSEMBLY STEP 4

Install the Belt and Set the Tension

INSTALLING THE BELT

1. Drop the notched side of the trolley clip into the

retaining slot on top of the trolley (Figure 1).

2. Grasp the clip connector at the end

of the belt and slip it through the belt

pulley bracket from behind, around

the pulley and toward the trolley.

3. Fasten the belt clip connector to the

trolley clip with a master link:

• Push pins of master link bar

through holes in trolley clip and belt

clip connector.

• Push master link cap over pins and

past pin notches.

• Slide clip-on spring over cap and onto

pin notches until both pins are securely

locked in place.

4. With the trolley against the screwdriver,

dispense the belt along the rail and around

the motor unit sprocket. The sprocket teeth

must engage the belt (Figure 2).

5. Use the second master link to connect the belt

to the flat end of the trolley threaded shaft

(Figure 1). Check to make sure the belt is not

twisted.

6. Remove the screwdriver.

SETTING THE TENSION

1. Insert the trolley threaded shaft through the hole in

the trolley.

2. Hold the belt at the trolley shaft to avoid twisting as

you thread the spring/trolley nut by hand on the

shaft until finger tight against the trolley (Figure 3).

Do not use any tools.

3. Insert a screwdriver tip into one of the nut ring

slots and brace it firmly against the trolley.

(Figure 4).

4. Place a 7/16" open end wrench on the square end.

Rotate about 1/4 turn until the spring releases and

snaps the nut ring against the trolley (Figure 5).

This extends the spring for optimum belt tension.

Nut

Ring

Trolley

Threaded

Shaft

Nut Ring

Slots

Square

End

Motor unit

Sprocket

Belt

Pulley

Slip Belt Clip

Connector around

Pulley Bracket

from this direction

and attach to trolley clip

Trolley

Clip

Master Link

Clip-On Spring

Master

Link Cap

Trolley

Threaded Shaft

Master

Link Bar

Master

Link Bar

Pin Notch

Belt

Clip Connector

Figure 2

Figure 4

Belt Clip

Connector

Trolley

Threaded

Shaft

Spring/Trolley Nut

Nut Ring Trolley

Nut Ring

Trolley

1" 1-1/4"

BEFORE AFTER RELEASE

Figure 5

Figure 3

To avoid possible SERIOUS INJURY to fingers from

moving garage door opener:

•ALWAYS keep hand clear of sprocket while operating

opener.

•Securely attach sprocket cover BEFORE operating.

WARNING

CAUTION

WARNING

Figure 1

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 39 40

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Chamberlain WD912K User Manual Page 10

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