Chamberlain 3245M 1/3 HP, 3255-2M 1/2 HP Motor Unit Assembly Parts, Complete with Spring washer

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Motor Unit Assembly Parts

1

2

4

18

6

3

17

		10
5		16
5
7
8	11	15
		15
	14	13
9	14
12

19

(Down)

Brown Contact LIMIT SWITCH ASSY. Wire

	DN		Grey
			Grey
	Drive		Wire
	Drive		UP
			UP
	Gear
	Center Limit	(Up)	Yellow
	Contact	Contact	Yellow
	Contact	Contact	Wire
			Wire

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

1	31D380	Sprocket cover	12	41A5525-24	Cover
2	41C4220A	Gear and sprocket assembly	13	41A2818	Limit switch drive & retainer
		Complete with: Spring washer,	14	41D3452	Limit switch assembly
		thrust washer, retaining ring,	14	41D3452	Limit switch assembly
		thrust washer, retaining ring,	15	41A2822-1	Interrupter cup assembly
		bearing plate, roll pins (2), drive	15	41A2822-1	Interrupter cup assembly
		bearing plate, roll pins (2), drive	16	41C4398A	RPM sensor assembly
		gear and worm gear, helical gear	16	41C4398A	RPM sensor assembly
		w/retainer and grease	17	41AC050-1M	Receiver logic board.
3	41A2817	Drive/worm gear kit w/grease,			Complete with: Logic board,
		roll pins (2)			end panel w/all labels
4	41B4245	Line cord	18	41C5498	Low voltage wire harness.
5	41A5484-1	End panel w/all labels		41C5497	High voltage wire harness.
6	4A1344	Light socket	19	41D180-1	End panel w/all labels
7	108D79	Lens			NOT SHOWN
8	30B532	Capacitor - 1/2 HP		41A2826	Motor shaft bearing kit
8	30B532	Capacitor - 1/2 HP		41A2825	Opener assembly hardware
	30B533	Capacitor - 1/3 HP		41A2825	Opener assembly hardware
9	12A373	Capacitor bracket			kit (includes screws not
9	12A373	Capacitor bracket			designated by a number in
10	41A3150	Terminal block w/screws			designated by a number in
10	41A3150	Terminal block w/screws			illustration)
11	41D3058	Universal replacement motor &			illustration)
11	41D3058	Universal replacement motor &

bracket assembly

Complete with: Motor, worm, bracket, bearing assembly, RPM sensor

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Image 34

Contents Garage Door Opener For Residential Use OnlyTable of Contents IntroductionSectional Door Preparing your garage doorTools needed One-Piece DoorONE-PIECE Door Without Track Sectional Door InstallationPlanning ONE-PIECE Door with TrackInstallation Hardware Carton InventoryAttach the Rail to the Motor Unit Assembly StepBolt previously removed from motor unit Installation Tighten the ChainInstallation Step Determine the Header Bracket LocationWall Header Bracket Installation Install the Header BracketCeiling Header Bracket Installation Attach the Rail to the Header Bracket Position the Opener Sectional Door or ONE-PIECE Door with TrackHang the Opener Install the Door Control Standard installation only Run bell wire up wallInstall the Light Attach the Emergency Release Rope and HandleElectrical Requirements Important Information about Safety Reversing Sensor Install The Protector SystemFacing the door from inside the garage Wall installation Installing the BracketsGarage door track installation preferred Floor installation FigureTroubleshooting the Safety Reversing Mounting and Wiring the Safety Reversing SensorsAligning the Safety Reversing Sensors Sectional Doors Metal, insulated or light weight factory reinforced doorsFasten the Door Bracket Wood DoorsONE-PIECE Doors Connect Door Arm to Trolley Sectional Doors onlyAssemble the door arm, Figure Adjustment procedures, FigureALL ONE-PIECE Doors Connect the door arm to the trolleyIf door does not open at least 5 feet 1.5 m Adjustment StepAdjust the UP and Down Travel Limits If the door does not close completelyTest the Down close force Adjust the ForceHOW and When to Adjust the Forces Test the UP open forceImportant Safety Check Test the Safety Reversal SystemAdjust Test The Protector SystemOperation Using Your Garage Door OpenerActivate your opener with any of the following Lock feature Light featureMULTI-FUNCTION Door Control Twice a Year Care of Your OpenerOnce a Month Once a YearHaving a PROBLEM? Symptom LED is not lit on door control Safety reversing sensors wire open broken or disconnectedDoor control or wire shorted Symptom Motor unit doesn’t operate Programming To Add or Reprogram a Hand-held Remote Control Using the Learn Button Using the Door Control To Erase All Codes From Motor Unit MemoryTo change an existing, known PIN To Add, Reprogram or Change a Keyless Entry PINTo set a temporary PIN Rail Assembly Parts Repair PartsInstallation Parts Complete with Spring washer Motor Unit Assembly PartsComplete with Logic board Accessories Liftmaster Service is On Call