Chamberlain HD210 - Page 9

8
Assembly
STEP 4 Install the chain
To avoid possible SERIOUS INJURY to finger from moving garage door opener:
l ALWAYS keep hand clear of sprocketwhile operating opener.
l Securelyattach chain spreader BEFORE operating.
1. Pull the cable around the idler pulley and toward the trolley.
2. Connectthe cable to the retaining sloton the trolley,as shown. (Figure 1)
a. Push pinsof master link bar through cable link and trolley slot.
b. Push master link cap over pins and pastpin 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 around the sprocket and continuing to the trolley assembly.The sprocket
teeth must engage the chain. (Figure 2)
4. Check to make sure the chain isnottwisted,then connect itto the threaded shaftwith the
remaining master link.
5. Thread the inner nut and lock washer onto the trolley threaded shaft.
6. Insertthe 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
Ma
ster
Link
Threaded Shaft
Figure 3
Threaded
Shaft
Outer
Nut
Inner
Nut
Lock
Washer
Master
Link
Master
Link
Figure 2
Sprocket
Figure 1
a.
b.
c.