Chamberlain HD800D Install the Belt, and Attach the Belt Cap Retainer, FLAT, FLAT

ASSEMBLY STEP 4
Install the Belt
	To avoid possible SERIOUS INJURY to fingers from moving
and Attach the Belt Cap Retainer	garage door opener:
1. Pull the belt around the idler pulley and toward the	• ALWAYS keep hand clear of sprocket while operating opener.
	• Securely attach sprocket cover BEFORE operating.
trolley. The ribbed side must contact the pulley.

2.Hook the trolley connector into the retaining slot on the trolley as shown.

3.With the trolley against the screwdriver, dispense the remainder of the belt along the rail length toward the motor unit and around the sprocket. The sprocket teeth must engage the belt.

4.Check to make sure the belt is not twisted and the FLAT side of the trolley threaded shaft is facing the rail. Connect the trolley threaded shaft with the master link, as illustrated:

•Push pins of master link bar through holes in end of belt and trolley threaded shaft.

•Push master link cap over pins and past pin notches.

•Slide clip-on spring over cap and onto pin notches

	until both pins are securely locked in place.	HARDWARE SHOWN ACTUAL SIZE
5.	Insert the trolley threaded shaft through the hole in the
	trolley. Be sure the belt is not twisted and the FLAT
	side faces the rail.
6.	Hold the belt at the trolley shaft as you thread the	Hex Screw 8x3/8"
	spring nut by hand onto the shaft until finger tight	Spring/Trolley Nut
	against the trolley. Do not use any tools.

7.Remove the screwdriver.

8.Position the belt cap retainer over the motor unit

sprocket as shown and fasten to the mounting plate
with 8x3/8" hex screws provided.	Master Link
	Clip-On Spring
	Master Link Cap
				Pin
				Notch
			Trolley	Master
			Threaded	Link Bar
			Shaft
			Hole
		Retaining
	Trolley	Slot	Hex Screws
			8x3/8"
	Connector
				Belt Cap
Idler Pulley				Retainer
				Motor Unit
				Sprocket
				Mounting
				Plate
Spring Nut

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