Rail Assembly Parts
Drawing A
Part Number:144C54 Pulley
Drawing Number:A-2
LIFTMASTER Garage Door Openers 144C54 Belt Drive Pulley
Installation Parts
Drawing B
Garage Door Opener Parts
Drawing C
Accessories
Drawing D
Please check with Chamberlain Customer Support in case of any doubt regarding the required replacement part. You can get replacement parts, Support Videos and instruction manuals on the Chamberlain website.