Chamberlain B2212T Installation Manual - English - Page 10

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"-20 x 1-3/4" 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 Bolt 1/4"-20x1-3/4" Lock Nut 1/4"-20 Bolt "U" Bracket Bolts (Mounted in the garage door opener) Cover Protection Bolt Hole Lock Nut 10

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10
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"-20 x 1-3/4" 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.
Bolt
1/4"-20x1-3/4"
Lock Nut
1/4"-20
HARDWARE
Bolts (Mounted in the
garage door opener)
Bolt
Lock Nut
Cover Protection
Bolt Hole
“U” Bracket