Craftsman 139.18451DM Manuel D'instructions page 10

ASSEMBLY STEP 4
Install the Chain/Cable
1. Pull the cable around the idler pulley and toward the trolley.
2. Connect the cable to the retaining slot on the trolley, as shown
(Figure 1):
• From below, push pins of master link bar up through cable
link and trolley slot.
• Push master link cap over pins and past pin notches.
• Slide clip-on spring over cap and onto pin notches until both
pins are securely locked in place.
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 threaded
shaft (Figure 3).
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.
Figure 1
To avoid possible SERIOUS INJURY to fi ngers from moving
garage door opener:
• ALWAYS keep hand clear of sprocket while operating
opener.
• Securely attach chain spreader BEFORE operating.
Keep Chain and Cable
Taut When Dispensing
Figure 2
Figure 3
Front Rail
Section
(TO DOOR)
10
Dispensing Carton
Leave Chain and Cable
Inside Dispensing
Carton to Prevent Kinking.
Sprocket
Master Link
Inner Nut
Lock Washer
Outer Nut
Threaded
Shaft
Master Link