Step 3 attach the belt cap retainer, Installation, Important installation instructions – Chamberlain 3850 User Manual

Page 7: Warning caution warning warning, Assembly step 3

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7

ASSEMBLY STEP 3

Attach the Belt Cap Retainer

• Position the belt cap retainer over the motor unit belt

pulley so the three holes in cap align with the three
holes in mounting plate. Attach with #8x3/8" hex screws
provided.

You have now finished assembling your garage door
opener. Please read the following warnings before
proceeding to the installation section.

INSTALLATION

8x3/8" Hex Screws

Belt Cap Retainer

Mounting Plate

Motor Unit Belt Pulley

To avoid possible SERIOUS INJURY to fingers from moving
garage door opener:
• ALWAYS keep hand clear of belt pulley while operating

opener.

• Securely attach belt pulley cover BEFORE operating.

Hex Screw
#8x3/8"

HARDWARE SHOWN

ACTUAL SIZE

To reduce the risk of SEVERE INJURY or DEATH:

WARNING

WARNING

WARNING

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 7 feet (2.1 m) or more above

floor.

6. Mount emergency release handle 6 feet (1.8 m) above floor.
7. NEVER connect garage door opener to power source until

instructed to do so.

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 control console:

• within sight of the garage door.
• out of reach of children at minimum height of

5 feet (1.5 m).

• away from ALL moving parts of the door.

10. Place entrapment warning label on wall next to garage

control console.

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 1-1/2"
(3.8 cm) high object (or a 2x4 laid flat) on the floor.

13. To avoid SERIOUS PERSONAL INJURY or DEATH from

electrocution, disconnect ALL electric and battery power
BEFORE performing ANY service or maintenance.

WARNING

CAUTION

WARNING

WARNING

IMPORTANT INSTALLATION INSTRUCTIONS

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