Install The Chain/Cable - Chamberlain Power Drive Security+ HD400DM Owner's Manual

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 4).
7. Loosely thread the outer nut onto the trolley threaded
shaft.
8. Remove the screwdriver.
Figure 2
"U" Bracket
Bolt
Figure 4
Chain Spreader
Motor Unit Sprocket
Trolley
Threaded
Shaft
Round
Hole
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.
Dispensing Carton
Keep Chain and Cable
Taut When Dispensing
Figure 1
Master Link
Clip-On
Spring
Cable
Link
Idler
Pulley
Cable
Figure 3
Lock
Washer
5/16"
10
Leave Chain and Cable
Inside Dispensing Carton
to Prevent Kinking.
Master Link
Clip-On
Spring
Master
Link Cap
Trolley
Threaded
Shaft
Round
Slotted
Master
Hole
Hole
Link Bar
Master
Link Bar
Trolley
Threaded
Shaft
Inner Nut
5/16"
Master
Link Cap
Pin Notch