Chamberlain PD220 1/2 HPS Chain Drive Garage Door Opener Manual - Page 9
STEP 4 Install the chain, - motor
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Assembly STEP 4 Install the chain To avoid possible SERIOUS INJURY to finger from moving garage door opener: l ALWAYS keep hand clear of sprocket while operating opener. l Securely attach chain spreader BEFORE operating. 1. Pull the cable around the idler pulley and toward the trolley. 2. Connect the cable to the retaining slot on the trolley. (Figure 1) a. Push pins of master link bar through cable link and trolley slot. b. Push master link cap over pins and past pin notches. c. Slide the closed end of the clip-on spring over one of the pins. Push the open end of the clip-on spring onto the other pin. 3. With the trolley against the screwdriver, dispense the remainder of the cable/chain along the rail toward the motor unit into the slot on the chain spreader, around the sprocket onto the chain spreader and continuing to the trolley assembly. The sprocket teeth must engage the chain. (Figure 2) 4. Check to make sure the chain is not twisted, then connect it to the threaded shaft with the remaining master link. 5. Thread the inner nut and lock washer onto the trolley thread shaft 6. Insert the trolley threaded shaft through the hole in the trolley. Be sure the chain is not twisted. (Figure 3) 7. Loosely thread the outer nut onto the trolley threaded shaft. 8. Remove the screwdriver. HARDWARE Figure 1 c. b. a. Front Rail Section (TO DOOR) Threaded Shaft Master Link Nut 5/16"-18 Lock Washer 5/16"-18 8 Figure 2 Sprocket Figure 3 Outer Nut Master Link Inner Lock Nut Washer Threaded Shaft Master Link