Sears 139.53930D owner manual Installation, Tighten Chain

ASSEMBLY		STEP 5
Tighten	the	Chain
		Figure	1		Trolley
• Spin the inner		nut and lock washer down the trolley
			Outer	Lock	Threaded
threaded shaft, away from the trolley.			Nut	Washer	Shaft

•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. Figure 2

When installation is complete, you may notice some chain

droop with the door closed. This is normal. If the chainChaini returns to the position shown in Figure 2 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 may notice loosening of chain after Adjustment Step 3 (Test the Safety Reversal System). Check for proper tension and readjust chain if necessary. Then repeat Adjustment Step 3.

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

	I
Base of Rail	Mid length of Rail

INSTALLATION

IMPORTANT INSTALLATION INSTRUCTIONS

To reduce the risk of SEVERE INJURY or DEATH:

1.READAND FOLLOWALL INSTALLATIONWARNINGS AND INSTRUCTIONS.

2.Install garage door opener only on properly balanced and lubricated garage door. An improperly balanced door may not reversewhen required and could result in SEVEREINJURYor DEATH.

3.ALL repairs to cables, spring assemblies and other hardware MUST be made by a trained door systems technician BEFOREinstalling opener.

4.DisableALL locks and remove ALL ropes connected to garage door BEFOREinstalling opener to avoid entanglement.

5.Install garage door opener 7 feet (2.13 m) or more above floor.

6.Mount emergency releasehandle 6 feet (1.83 m) above floor.

7.NEVERconnect garage door openerto power source until instructed to do so.

8.NEVERwear 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).

•awayfrom ALL moving parts of the door.

10.Placeentrapment warning label on wall next to garage door control.

11.Placemanual release/safetyreversetest label in plain view on inside of garage door.

12.Upon completion of installation, test safety reversal system. Door MUST reverseon contact with a

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

11