Chamberlain 248730 - Manual (Page 9)

8
Assembly
STEP 4 Install the chain
1. Pull the cable around the idler pulley and toward the trolley.
2. Connect the cable to the retaining slot on the trolley. (a)
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 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. (b)
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.
6. Insert the trolley threaded shaft through the hole in the trolley. Be sure the chain is not
twisted. (c)
7. Loosely thread the outer nut onto the trolley threaded shaft.
8. Remove the screwdriver.
HARDWARE
Master
Link
Threaded Shaft
c.
Threaded
Shaft
Outer
Nut
Front Rail
Section
(TO DOOR)
Inner
Nut
Lock
Washer
Master Link
Master
Link
b.
a.
Sprocket