Chamberlain 248735 3/4 HP Motor Unit Assembly Parts

Motor Unit Assembly Parts

			4	1
			4	2
				2
	7	6	3		6
	7	6	3	5	7
		17		5
		17
		16

14 9

18	8A	8B
		15

10

8C

12			13		(Down)	LIMIT SWITCH
				Brown	Contact	ASSEMBLY
				Wire

11

DN

Drive	UP
	UP
Gear
Center Limit	(Up)
Contact	Contact

Grey Wire

Yellow

Wire

	KEY	PART		KEY	PART
	KEY	PART		KEY	PART
	NO.	NO.	DESCRIPTION	NO.	NO.	DESCRIPTION

	1	41A5615	Chain Spreader	11	41A5633-2	Cover
	2	41A5585	Gear and sprocket assembly.	12	41A2818	Limit switch drive & retainer
			Complete with: Spring washer,	13	41D3452-2	Limit switch assembly
			thrust washer, retaining ring,	13	41D3452-2	Limit switch assembly
			thrust washer, retaining ring,	14	41A2822-1	Interrupter cup
			bearing plate, roll pins (2), drive	14	41A2822-1	Interrupter cup
			bearing plate, roll pins (2), drive	15	41C4398A	RPM sensor assembly
			gear and worm gear, helical gear	15	41C4398A	RPM sensor assembly
			w/retainer and grease	16	41AC075-2	Receiver logic board assembly.
				16	41AC075-2	Receiver logic board assembly.
	3	41A2817	Drive/worm gear kit w/grease,			Complete with: Logic board, end
			roll pins (2)			panel w/all labels, light socket
	4	41B4245	Line cord	17	41C5588	High voltage wire harness
	5	41A5484-1	End panels w/all labels		41C5587	Low voltage wire harness
	5	41A5484-1	End panels w/all labels	18	41D180-1	End panel w/all labels
	6	4A1344	Light socket	18	41D180-1	End panel w/all labels
	6	4A1344	Light socket
	7	108D79	Lens			NOT SHOWN
	8A	30B530	Capacitor 56uF		41A2826	Motor shaft bearing kit
	8A	30B530	Capacitor 56uF		41A2825	Opener assembly hardware kit
	8B	30B529	Capacitor 40uF		41A2825	Opener assembly hardware kit
	8B	30B529	Capacitor 40uF			(includes screws not designated
	8C	41A5637	Resistor			(includes screws not designated
	8C	41A5637	Resistor			by a number in illustration)
	9	41A3150	Terminal block w/screws			by a number in illustration)
	9	41A3150	Terminal block w/screws
	10	41D5563	Universal replacement motor &
			bracket assembly. Complete
			with: Motor, worm, bracket,
			bearing assembly, RPM sensor

38

Contents

For Residential Use Only Introduction Assembly Installation Safety Symbol and Signal Word Review Preparing your garage door Tools needed Planning Planning (Continued) Carton Inventory Hardware Inventory Assemble the Rail & Install the Trolley Fasten the Rail to the Motor Unit Install the Idler Pulley Install the Chain/Cable Tighten the Chain Determine the Header Bracket Location Install the Header Bracket Attach the Rail to the Header Bracket Position the Opener Hang the Opener Install the Door Control Install the Lights Attach the Emergency Release Rope and Handle Electrical Requirements Install The Protector System® INSTALLING THE BRACKETS Garage door track installation (preferred): Wall installation (Figure 2 & 3): Floor installation (Figure 4): MOUNTING AND WIRING THE SAFETY REVERSING SENSORS ALIGNING THE SAFETY REVERSING SENSORS TROUBLESHOOTING THE SAFETY Fasten the Door Bracket ONE-PIECEDOORS Metal Doors: Connect Door Arm to Trolley ALL ONE-PIECEDOORS 1.Assemble the door arm, Figure 4: 2.Adjustment procedures, Figure 5: •Open door adjustment: decrease UP travel limit •Closed door adjustment: decrease DOWN travel limit Adjust the UP and DOWN Travel Limits Adjust the Force Test the Safety Reversal System Test The Protector System® Using Your Garage Door Opener Using the Wall-MountedDoor Control To Open the Door Manually CARE OF YOUR OPENER LIMIT AND FORCE ADJUSTMENTS: THE REMOTE CONTROL BATTERY Repeat the safety reverse test (Adjustment Step 3, page 29) after any adjustment of limits or force HAVING A PROBLEM 1. My door will not close and the light bulbs blink on my motor unit: 2. My remotes will not activate the door: 3. My door reverses for no apparent reason: Repeat 1 FLASH 2 FLASHES 3 FLASHES 4 FLASHES 5 FLASHES To Add or Reprogram a Hand-heldRemote Control To Erase All Codes From Motor Unit Memory *3-ButtonRemotes To Add, Reprogram or Change a Keyless Entry PIN Rail Assembly Parts Installation Parts Motor Unit Assembly Parts ACCESSORIES 953D 3-ButtonSECURITY✚® Remote Control: 956D CHAMBERLAIN® ONE YEAR LIMITED WARRANTY 10 YEAR MOTOR LIMITED WARRANTY