Tighten The Chain And Cable; Installation - Chamberlain 4142DC Owner's Manual

ASSEMBLY STEP 5

Tighten the Chain and Cable

• Spin the inner nut and lock washer down the trolley threaded
shaft, away from the trolley.
• To tighten the chain, turn outer nut in the direction shown.
AS YOU TURN THE NUT, KEEP THE CHAIN FROM TWISTING.
• When the chain is approximately 13 mm above the base of the
rail at its midpoint, re-tighten the inner nut to secure the
adjustment.
Sprocket noise can result if chain is either too loose or too
tight.
NOTE: When installation is complete, you may notice some chain
droop with the door closed. This is normal. If the chain returns to
the position shown when the door is open, do not re-adjust the
chain.
NOTE: During future maintenance, ALWAYS pull the emergency
release handle to disconnect trolley before adjusting chain.
You have now finished assembling your garage door opener.
Please read the following warnings before proceeding to the
installation section.

INSTALLATION

IMPORTANT INSTALLATION INSTRUCTIONS
To reduce the risk of SEVERE INJURY OR DEATH:
1. READ AND FOLLOW ALL INSTALLATION WARNINGS
AND INSTRUCTIONS.
2. Install garage door opener ONLY on properly balanced
and lubricated garage door. An improperly balanced door
may not reverse when required and could result in
SEVERE INJURY OR DEATH.
3. ALL repairs to cables, spring assemblies and other
hardware MUST be made by a trained door systems
technician BEFORE installing opener.
4. Disable ALL locks and remove ALL ropes connected to
garage door BEFORE installing opener to avoid
entanglement.
5. Install garage door opener 2.13 m or more above floor.
6. Mount emergency release handle 1.83 m above floor.
7. NEVER connect garage door opener to power source
until instructed to do so.
To Tighten Outer Nut
WARNING
WARNING
A
WARNING WARNING
8. NEVER wear watches, rings or loose clothing while
installing or servicing opener. They could be caught in
garage door or opener mechanisms.
9. Install wall-mounted garage door control:
• within sight of the garage door.
• out of reach of children at minimum height of 1.5 m.
• away from ALL moving parts of the door.
10. Place entrapment warning label on wall next to garage
door control.
11. Place manual release/safety reverse test label in plain
view on inside of garage door.
12. Upon completion of installation, test safety reversal
system. Door MUST reverse on contact with a
38 mm high object (or a 2x4 laid flat) on the floor.
15
Lock
Washer
Outer Nut
Inner Nut
To Tighten
Inner Nut
Chain
13 mm
Base of Rail