Tighten the chain, Installation, Ik warning – Craftsman 139.53910 User Manual

Page 11: Assembly step 5

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Tighten the Chain

• 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 (Figure 1).

• When the chain is approximately 1/4" (6 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 too loose.

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 in Figure 2
when the door is open, do not re-adjust the chain.

NO TE:

During future maintenance, ALWAYS pull the

emergency release handle to disconnect trolley
before adjusting chain.

NO TE:

You may notice loosening of chain after

Adjustment Step 3 (Test the Safety Reversai

System). Check for proper tension and readjust
chain if necessary. Then repeat Adjustment Step 3.

You have now finished assem biing your garage

door opener. Piease read the foliow ing w arnings

before proceeding to the instailation section.

ASSEMBLY STEP 5

Figure 1

Trolley

Outer Lock Threaded
Nut Washer Shaft

Chain

Base of Rail

Mid'length of Rail

INSTALLATION

IMPORTANT INSTALLATION INSTRUCTIONS

ik WARNING

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 7 feet (2.13 m) or more

above floor.

6. Mount emergency release handle 6 feet (1.83 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 door control:

• 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

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
1-1/2“ (3.8 cm) high object (ora 2x4 laid flat) on

the floor.

11

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