Chamberlain HD950WF HD950WF Owners Manual Manual - Page 7

STEP 2 Fasten the rail to the motor unit, STEP 3 Install the idler pulley, HARDWARE

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Assembly STEP 2 Fasten the rail to the motor unit To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the top of the opener. 1. Insert a 1/4"-20x1-3/4" bolt into the cover protection bolt hole on the back end of the rail as shown. Tighten securely with a 1/4"-20 lock nut. DO NOT overtighten. 2. Remove the bolts from the top of the motor unit. 3. Use the carton to support the front end of the rail. 4. Place the "U" bracket, flat side down onto the motor unit and align the bracket holes with the bolt holes. 5. Fasten the "U" bracket with the previously removed bolts; DO NOT use any power tools. The use of power tools may permanently damage the garage door opener. HARDWARE STEP 3 Install the idler pulley 1. Lay the belt beside the rail, as shown. Grasp the end with the hooked trolley connector and pass approximately 12" (30 cm) of belt through the window. Keep the ribbed side toward the rail, and allow it to hang until Assembly Step 4. 2. Remove the tape from the idler pulley. The inside center should be pre-greased. If dry, regrease to ensure proper operation. 3. Place the idler pulley into the window as shown. 4. Insert the idler bolt from the top through the rail and pulley. Tighten with a 3/8" lock washer and nut underneath the rail until the lock washer is compressed. 5. Rotate the pulley to be sure it spins freely. 6. Locate the rail tab. The rail tab is between the idler bolt and the trolley in the front rail section. Use a flathead screwdriver and lift the rail tab until the tab is vertical (90º). HARDWARE Bolt Lock Washer 3/8" Nut 3/8" Bolt 1/4"-20x1-3/4" Bolts (Mounted in the garage door opener) "U" Bracket Bolt 1/4"-20x1-3/4" Cover Protection Bolt Hole Lock Nut 1/4"-20 Lock Nut 1/4"-20 6 Rail Tab CORRECT INCORRECT Bolt Rail Tab Lock Washer 3/8" Nut 3/8" Rail Grease Inside Pulley Idler Pulley Trolley Connector

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6
Assembly
STEP 2 Fasten the rail to the motor unit
To avoid SERIOUS damage to garage door opener, use ONLY those bolts/fasteners mounted in the
top of the opener.
1.
Insert a 1/4"-20x1-3/4" bolt into the cover protection bolt hole on the back end of the rail as
shown. Tighten securely with a 1/4"-20 lock nut. DO NOT overtighten.
2.
Remove the bolts from the top of the motor unit.
3.
Use the carton to support the front end of the rail.
4.
Place the “U” bracket, flat side down onto the motor unit and align the bracket holes with the bolt
holes.
5.
Fasten the “U” bracket with the previously removed bolts; DO NOT use any power tools. The use
ofpower tools may permanently damage the garage door opener.
“U” Bracket
Cover Protection Bolt Hole
Bolt 1/4"-20x1-3/4"
Lock Nut 1/4"-20
Bolts (Mounted in the garage door opener)
HARDWARE
Bolt 1/4"-20x1-3/4"
Lock Nut 1/4"-20
STEP 3 Install the idler pulley
1.
Lay the belt beside the rail, as shown. Grasp the end with the hooked trolley connector and pass
approximately 12" (30 cm) of belt through the window. Keep the ribbed side toward the rail, and
allow it to hang until Assembly Step 4.
2.
Remove the tape from the idler pulley. The inside center should be pre-greased. If dry, regrease
to ensure proper operation.
3.
Place the idler pulley into the window as shown.
4.
Insert the idler bolt from the top through the rail and pulley. Tighten with a 3/8" lock washer and
nut underneath the rail until the lock washer is compressed.
5.
Rotate the pulley to be sure it spins freely.
6.
Locate the rail tab. The rail tab is between the idler bolt and the trolley in the front rail section. Use
a flathead screwdriver and lift the rail tab until the tab is vertical (90º).
Rail
Trolley Connector
Bolt
Lock Washer 3/8"
Nut 3/8"
Rail Tab
CORRECT
INCORRECT
Idler Pulley
Grease Inside Pulley
HARDWARE
Bolt
Nut 3/8"
Lock Washer 3/8"
Rail Tab