LiftMaster GH5HP Owners Manual - Page 4

OPERATOR MOUNTING Before your operator is installed, be sure the door has been properly aligned and is working smoothly. The operator may be wall mounted or mounted on a bracket or shelf. If necessary, refer to the operator preparations on page 3. Refer to the illustration and instructions below that suits your application. NOTE: The operator has a weight of 300 lbs. 1a. Wall Mounting The operator should generally be installed below the door shaft, and as close to the door as possible. Refer to Figure 3. 1b. Bracket or Shelf Mounting The operator may be mounted either above or below the door shaft. Refer to Figure 4. Typical Right Hand Wall Mounted Operator FIGURE 3 1c. Place door sprocket on the door shaft. Do not insert the key at this time. 2. Place drive sprocket on the appropriate side of the operator. Do not insert the key at this time. 3. Wrap drive chain around door sprocket and join roller chain ends together with master link. 4. Raise operator to approximate mounting position using suitable lifting apparatus and position chain over operator sprocket. 5. Raise or lower operator until the chain is taut (not tight). Make sure the operator output shaft is parallel to door shaft and sprockets are aligned. When in position, secure the operator to wall or mounting bracket. 6. Align sprockets and secure, (see Figure 5). 4 IMPORTANT: The shelf or bracket must provide adequate support, prevent play between operator and door shaft, and permit operator to be fastened securely and with the drive shaft parallel to the door shaft. FIGURE 4 Be sure door sprocket is properly aligned with drive before securing to the shaft. Chain Keeper FIGURE 5