Chamberlain 248730DM Assembly & Installation Manual page 8

Route Chain/Cable Around Rail Assembly
8
and Motor Unit Sprocket
Leave chain/cable inside
carton to prevent kinking
9 Attach Chain To Trolley
Threaded Shaft
B4
Master Link
Clip-On Spring
B1
Trolley
Threaded
Shaft
Tighten the Chain
12
Assembly of your opener is now complete.
B1
Cable
10 Attach Nut and Lock
Washer to Trolley
Threaded Shaft
C5
Lock
Washer
B4
Master
Link Bar
ALL HARDWARE SHOWN ACTUAL SIZE
Threaded Trolley Shaft
To avoid possible SERIOUS INJURY to fingers:
• Securely attach chain spreader.
• NEVER connect garage door opener to power source until
instructed to do so.
A2
Chain and
Cable in
Dispensing
Carton
Chain
B1
Trolley
Threaded
Shaft
C4
Inner Nut
Desired Chain Tension
A2
Chain
Base of Rail
Mid Length of Rail
B4
Master Link
8
WARNING
CAUTION CAUTION
Motor Unit
Sprocket
11 Insert Trolley Threaded
Shaft into Round Hole in
Trolley
C6
Lock Washer
C5
Outer Nut
1/4" (6 mm)
C4 C5
Nut
B1
Trolley
Threaded
Shaft
Lock Washer