Craftsman 139.18987 Owner's Manual download pdf (Page 26)

Lock

Washers

5/16"

Nuts

5/16"-18

Screws

5/16"-18x7/8"

Cut This End

Lock

Washers

5/16"

Nuts

5/16"-18

Door Bracket

Screws

5/16"-18x7/8"

Ring

Fastener

Door

Bracket

Clevis Pin

5/16"x1-1/4"

Curved

Door Arm

Straight

Door Arm

Clevis Pin

5/16"x1"

Inner

Trolley

Stop Bolt

Trolley

Stop Bolt

Trolley

Stop Bolt

8" MIN.

Outer

Trolley

Installation Step 12

Connect Door Arm to Trolley

Follow instructions which apply to your door

type as illustrated.

Make sure garage door is fully closed. Pull the emergency release handle to disconnect the outer trolley from

the inner trolley. Slide the outer trolley back (away from the pulley) for 8" minimum as shown below.

Figure 2:

• Bring arm sections together. Find two pairs of holes

that line up and join sections. Select holes as far

apart as possible to increase door arm rigidity.

Figure 3:

• If holes in curved arm are

above

holes in straight

arm, disconnect straight arm. Cut about 6" from

the solid end. Reconnect to trolley with

cut end

down

as shown.

• Bring arm sections together.

• Find two pairs of holes that line up and join with

screws, lock washers and nuts.

Proceed to Adjustment Step 1, page 28. Trolley will re-engage automatically when the opener is operated.

Figure 1:

• Fasten straight door arm section to outer trolley

with the 5/16"x1" clevis pin. Secure the connection

with a ring fastener.

• Fasten curved section to the door bracket in the

same way, using the

5/16"x1-1/4" clevis pin.

Figure 1

SECTIONAL Doors Only

Lock Washer 5/16"

Nut 5/16"-18

Ring Fastener

Hex Screw

5/16"-18x7/8"

Clevis Pin

5/16"x1" (Trolley)

Clevis Pin

5/16"x1-1/4" (Door Bracket)

Hardware Shown Actual Size

Figure 2

Figure 3

Hole Alignment Alternative

1 ... 25 26 27 ... 40

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Craftsman 139.18987 Owner's Manual Page 26

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